diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index 0928de2..5b7ff33 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -91,7 +91,9 @@ jobs:
 
       - run: npm run build --workspaces --if-present
 
-      - run: npm run test --workspaces --if-present
+      # shuffled so a test that only passes after another one fails here; the seed is the run id, so a failure
+      # reproduces locally with `npm test -- --sequence.shuffle --sequence.seed=<run id>`
+      - run: npm run test --workspaces --if-present -- --sequence.shuffle --sequence.seed=${{ github.run_id }}
 
   next-fixture:
     if: startsWith(github.head_ref, 'release-please--')
diff --git a/.github/workflows/contract.yml b/.github/workflows/contract.yml
new file mode 100644
index 0000000..d10c85c
--- /dev/null
+++ b/.github/workflows/contract.yml
@@ -0,0 +1,31 @@
+name: contract
+
+# The derivative API contract tests against the real upload.uploadcare.com.
+# Run by hand only (each run spends one AI generation); the same tests run
+# against the emulator in every `npm test`. Needs the UC_CONTRACT_PUBLIC_KEY
+# secret: a project with AI derivatives enabled and signed uploads off. When
+# it is missing the run fails instead of skipping.
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  contract:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+
+      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
+        with:
+          node-version: 24
+          cache: npm
+
+      - run: npm ci
+
+      - name: Run the contract tests against the real API
+        env:
+          UC_CONTRACT_PUBLIC_KEY: ${{ secrets.UC_CONTRACT_PUBLIC_KEY }}
+        run: npm run test:contract:live -w @uploadcare/ai-image-editor
diff --git a/AGENTS.md b/AGENTS.md
index 8dd55ed..5b41e4a 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -76,6 +76,64 @@ packages again would give the plugin two `AuthTokenResolverError` classes:
 `instanceof` fails across them and the editor wraps the uploader's error a
 second time, pushing the original one level deeper on `cause`.
 
+## Tests talk to the Uploadcare API emulator
+
+`@uploadcare/api-emulator` (a devDependency of `packages/ai-image-editor`)
+stands in for the Upload API and CDN; tests should not hand-write Uploadcare
+responses.
+
+- **Specs** (happy-dom) run against `setupEmulator()` from
+  `@uploadcare/api-emulator/node`, started once in `tests/specs/setup.ts`
+  (the `specs` project's setup file). It answers the global `fetch` and
+  `node:http(s)` (upload-client's transport, so `getFileInfo` too), refuses
+  every other origin, and resets the session before every test: import
+  `session` from there to register a scenario or read what was sent from its
+  `requests`. The clients call the global `fetch`; a spec that checks what
+  they pass it uses `vi.spyOn(globalThis, 'fetch')` and restores it after the
+  test.
+- **Browser e2e** run the emulator in the page with
+  `setupEmulator()` from `@uploadcare/api-emulator/browser` (MSW and
+  `@mswjs/interceptors` underneath, both devDependencies of the root
+  `package.json`):
+  `tests/emulator.ts` emulates Uploadcare's hosts and `cdn.example.com` (the
+  tests' CDN cname), fails any other Uploadcare host, passes every
+  non-Uploadcare origin through, and resets the session before every test;
+  import `session` from there to register a scenario or preset, or to read
+  what the editor sent (`requests`) and what a run produced (`files`; the
+  harness's `resultUuid()` answers the one that isn't a `DEMO_FILES` image).
+  A test that checks what the editor passed `fetch` itself uses
+  `vi.spyOn(globalThis, 'fetch')` and restores it after the test. The editor
+  tests apply the `derivativesInstant` preset (`tests/editor/harness.ts`) so
+  a generation finishes on its first poll instead of after the editor's 1.5s
+  interval several times over.
+- **Contract** tests (`tests/contract/`, the `contract` project) hold the
+  derivative API to one set of assertions on two targets: the emulator in
+  every `npm test`, and the real `upload.uploadcare.com` with
+  `npm run test:contract:live -w @uploadcare/ai-image-editor`
+  (`UC_CONTRACT_PUBLIC_KEY` required; the run fails without it). CI runs the
+  live target only by hand (the `contract` workflow).
+- In specs, e2e and contract tests, a request or response that fails the
+  client's dev schemas (`uploadcareApiClient.schemas.dev.ts`) fails the test
+  (`tests/schema-drift.ts`).
+- Steer the emulator per test with `session.on()` and `session.use(preset)`
+  (`session` from the project's setup file); there are no magic keys,
+  prompts or uuids.
+- Bearer tokens must be real: mint them with the emulator's `mintAuthToken()`
+  (WebCrypto, so it works in the page too). The images every fresh session
+  holds are its `DEMO_FILES`.
+- A `session.on()` handler runs before the emulator's routes and can answer
+  any `Response` or a promise that never settles, so a bare non-JSON failure,
+  a job stuck in `processing` or a poll that hangs is a scenario, not a stub.
+  Stub `fetch` only where it is simpler, and say why next to it.
+
+The React wrapper's e2e project runs against the same in-page emulator
+(`packages/react-ai-image-editor/tests/e2e/setup.ts`), so a request the
+element starts making there fails loudly instead of reaching the network.
+
+In both packages the dependency is a TEMPORARY `file:` link to an unreleased
+checkout, so `npm ci` only resolves it on that machine; swap it for a version
+once the package ships.
+
 ## Docs layout
 
 `docs/` is a VitePress site published to GitHub Pages: hand-written guides in
diff --git a/biome.json b/biome.json
index 54ea4d6..0a151aa 100644
--- a/biome.json
+++ b/biome.json
@@ -1,5 +1,8 @@
 {
   "$schema": "https://biomejs.dev/schemas/2.2.6/schema.json",
+  "files": {
+    "includes": ["**", "!**/.next"]
+  },
   "assist": {
     "actions": {
       "source": {
diff --git a/package-lock.json b/package-lock.json
index cc13342..631c880 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,18 +14,60 @@
       ],
       "devDependencies": {
         "@biomejs/biome": "2.2.6",
-        "@vitest/browser-playwright": "^4.1.10",
+        "@microsoft/api-extractor": "^7.59.4",
+        "@mswjs/interceptors": "0.45.7",
+        "@vitest/browser-playwright": "^4.1.11",
+        "esbuild": "^0.28.2",
         "happy-dom": "^20.9.0",
         "husky": "^9.0.11",
         "lerna": "^10.0.1",
         "lint-staged": "^15.2.2",
+        "msw": "3.0.2",
         "typescript": "^5.6.0",
-        "vite": "^6.2.3",
-        "vite-plugin-dts": "^4.5.0",
-        "vitest": "^4.1.10"
+        "vite": "^8.3.3",
+        "vite-plugin-dts": "^5.1.2",
+        "vitest": "^4.1.11"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "../uc-586-sync/packages/api-emulator": {
+      "name": "@uploadcare/api-emulator",
+      "version": "6.23.0",
+      "dev": true,
+      "license": "MIT",
+      "devDependencies": {
+        "@mswjs/interceptors": "^0.45.7",
+        "@vitest/browser-playwright": "^4.1.11",
+        "@vitest/coverage-v8": "^4.1.11",
+        "ajv": "^8.17.1",
+        "ajv-formats": "^3.0.1",
+        "fast-check": "^4.10.2",
+        "msw": "^3.0.2",
+        "oxfmt": "^0.53.0",
+        "oxlint": "^1.68.0",
+        "oxlint-tsgolint": "^0.23.0",
+        "playwright": "^1.63.0",
+        "vite": "^7.0.0",
+        "vite-plugin-dts": "^4.5.4",
+        "vitest": "^4.1.11",
+        "yaml": "^2.9.1"
       },
       "engines": {
         "node": ">=20"
+      },
+      "peerDependencies": {
+        "@mswjs/interceptors": "^0.45.7",
+        "msw": "^3.0.2"
+      },
+      "peerDependenciesMeta": {
+        "@mswjs/interceptors": {
+          "optional": true
+        },
+        "msw": {
+          "optional": true
+        }
       }
     },
     "node_modules/@algolia/abtesting": {
@@ -715,9 +757,9 @@
       }
     },
     "node_modules/@esbuild/aix-ppc64": {
-      "version": "0.25.12",
-      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.25.12.tgz",
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+      "version": "0.28.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.28.2.tgz",
+      "integrity": "sha512-XExcO+dvLKvVtNTibSTBej1NCAbaGhWn9Ww1ZPx80qsahhPFe/8jgWP0IchNe0F3HwkU7n8ejhH8bjonqht8mQ==",
       "cpu": [
         "ppc64"
       ],
@@ -732,9 +774,9 @@
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     },
     "node_modules/@esbuild/android-arm": {
-      "version": "0.25.12",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.25.12.tgz",
-      "integrity": "sha512-VJ+sKvNA/GE7Ccacc9Cha7bpS8nyzVv0jdVgwNDaR4gDMC/2TTRc33Ip8qrNYUcpkOHUT5OZ0bUcNNVZQ9RLlg==",
+      "version": "0.28.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.28.2.tgz",
+      "integrity": "sha512-kXXoiPVVGQcnIYGOeaovwOURpniDBpSq4A03qkQ+BMQqtGG6HYap3xne9C1O1yo4TR3qxlCX5IqqmX6fFo2Lqg==",
       "cpu": [
         "arm"
       ],
@@ -749,9 +791,9 @@
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     "node_modules/@esbuild/android-arm64": {
-      "version": "0.25.12",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.25.12.tgz",
-      "integrity": "sha512-6AAmLG7zwD1Z159jCKPvAxZd4y/VTO0VkprYy+3N2FtJ8+BQWFXU+OxARIwA46c5tdD9SsKGZ/1ocqBS/gAKHg==",
+      "version": "0.28.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.28.2.tgz",
+      "integrity": "sha512-5YfKeeI8qWfBZIX+u2xZC3Zlb3Os/gLS2sbEKM+I4ZOcsWmHS2WLysCcQZDAFRslDUU5Oiq44gf6PYN1vGwG5A==",
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@@ -766,9 +808,9 @@
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     "node_modules/@esbuild/android-x64": {
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-      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.25.12.tgz",
-      "integrity": "sha512-5jbb+2hhDHx5phYR2By8GTWEzn6I9UqR11Kwf22iKbNpYrsmRB18aX/9ivc5cabcUiAT/wM+YIZ6SG9QO6a8kg==",
+      "version": "0.28.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.28.2.tgz",
+      "integrity": "sha512-O387ite7SzUyCcy3JQX4P4bLtEA7bLLkx+esve5JHnyYfNTxcVpXZo9jhdB0lTKN44gztELTdU7nS8Nr16Fs1Q==",
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@@ -783,9 +825,9 @@
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     "node_modules/@esbuild/darwin-arm64": {
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-      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.25.12.tgz",
-      "integrity": "sha512-N3zl+lxHCifgIlcMUP5016ESkeQjLj/959RxxNYIthIg+CQHInujFuXeWbWMgnTo4cp5XVHqFPmpyu9J65C1Yg==",
+      "version": "0.28.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.28.2.tgz",
+      "integrity": "sha512-n4KqkOQrraxHJcgjM1RvwbigfQKIKJVpM7xp+KsxiyUSrRdIXnt73VhrPAx0fV44hgfmIVKjxMN9J1t5jySVkw==",
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@@ -800,9 +842,9 @@
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     "node_modules/@esbuild/darwin-x64": {
-      "version": "0.25.12",
-      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.25.12.tgz",
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+      "version": "0.28.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.28.2.tgz",
+      "integrity": "sha512-uq6suIWYP37qzGddBKPw5QEQPi6HiLGsO7UmkpfyaYNQ3D+rN6w6WfwH+nuqcGXWvawGwxOEroO4YGnFh95azw==",
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@@ -817,9 +859,9 @@
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     "node_modules/@esbuild/freebsd-arm64": {
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-      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-arm64/-/freebsd-arm64-0.25.12.tgz",
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+      "version": "0.28.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-arm64/-/freebsd-arm64-0.28.2.tgz",
+      "integrity": "sha512-n+I0BTSRIoy+d6RPKnEVwql5UwBJolytvY4mAOIEJorKlqgPII8ix6slVVrfZ5Tnj7glIZvloylbB/EJPMWEXw==",
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@@ -834,9 +876,9 @@
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     "node_modules/@esbuild/freebsd-x64": {
-      "version": "0.25.12",
-      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-x64/-/freebsd-x64-0.25.12.tgz",
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+      "version": "0.28.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-x64/-/freebsd-x64-0.28.2.tgz",
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@@ -851,9 +893,9 @@
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+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm/-/linux-arm-0.28.2.tgz",
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@@ -868,9 +910,9 @@
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+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm64/-/linux-arm64-0.28.2.tgz",
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@@ -885,9 +927,9 @@
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@@ -902,9 +944,9 @@
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     "node_modules/@esbuild/linux-loong64": {
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         "loong64"
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@@ -919,9 +961,9 @@
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     "node_modules/@esbuild/linux-mips64el": {
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@@ -936,9 +978,9 @@
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@@ -970,9 +1012,9 @@
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@@ -987,9 +1029,9 @@
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-        "@vitest/pretty-format": "4.1.10",
-        "@vitest/runner": "4.1.10",
-        "@vitest/snapshot": "4.1.10",
-        "@vitest/spy": "4.1.10",
-        "@vitest/utils": "4.1.10",
+        "@vitest/expect": "4.1.11",
+        "@vitest/mocker": "4.1.11",
+        "@vitest/pretty-format": "4.1.11",
+        "@vitest/runner": "4.1.11",
+        "@vitest/snapshot": "4.1.11",
+        "@vitest/spy": "4.1.11",
+        "@vitest/utils": "4.1.11",
         "es-module-lexer": "^2.0.0",
         "expect-type": "^1.3.0",
         "magic-string": "^0.30.21",
@@ -14735,12 +16049,12 @@
         "@edge-runtime/vm": "*",
         "@opentelemetry/api": "^1.9.0",
         "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
-        "@vitest/browser-playwright": "4.1.10",
-        "@vitest/browser-preview": "4.1.10",
-        "@vitest/browser-webdriverio": "4.1.10",
-        "@vitest/coverage-istanbul": "4.1.10",
-        "@vitest/coverage-v8": "4.1.10",
-        "@vitest/ui": "4.1.10",
+        "@vitest/browser-playwright": "4.1.11",
+        "@vitest/browser-preview": "4.1.11",
+        "@vitest/browser-webdriverio": "4.1.11",
+        "@vitest/coverage-istanbul": "4.1.11",
+        "@vitest/coverage-v8": "4.1.11",
+        "@vitest/ui": "4.1.11",
         "happy-dom": "*",
         "jsdom": "*",
         "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
@@ -14784,6 +16098,33 @@
         }
       }
     },
+    "node_modules/vitest/node_modules/@vitest/mocker": {
+      "version": "4.1.11",
+      "resolved": "https://registry.npmjs.org/@vitest/mocker/-/mocker-4.1.11.tgz",
+      "integrity": "sha512-2XJVD55d1o5AZous5CCGKS74g/riOj9odEt2bQpCVZeblHyHdnMeFl4jl0XjU21stf4mbjUkew2eXQZt65g5CQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/spy": "4.1.11",
+        "estree-walker": "^3.0.3",
+        "magic-string": "^0.30.21"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "msw": "^2.4.9",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "msw": {
+          "optional": true
+        },
+        "vite": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/vitest/node_modules/fdir": {
       "version": "6.5.0",
       "resolved": "https://registry.npmjs.org/fdir/-/fdir-6.5.0.tgz",
@@ -14803,9 +16144,9 @@
       }
     },
     "node_modules/vitest/node_modules/picomatch": {
-      "version": "4.0.4",
-      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.4.tgz",
-      "integrity": "sha512-QP88BAKvMam/3NxH6vj2o21R6MjxZUAd6nlwAS/pnGvN9IVLocLHxGYIzFhg6fUQ+5th6P4dv4eW9jX3DSIj7A==",
+      "version": "4.0.7",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.7.tgz",
+      "integrity": "sha512-qcJu88Q2IWqJsDD529JKMdwGm/dvInW4HvQnRwiH9JtihJvzGOscDtHE3x1pBKeUOTysQ8kVmLnJ2kJu7yhcGA==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -14816,9 +16157,9 @@
       }
     },
     "node_modules/vitest/node_modules/tinyglobby": {
-      "version": "0.2.16",
-      "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.16.tgz",
-      "integrity": "sha512-pn99VhoACYR8nFHhxqix+uvsbXineAasWm5ojXoN8xEwK5Kd3/TrhNn1wByuD52UxWRLy8pu+kRMniEi6Eq9Zg==",
+      "version": "0.2.17",
+      "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.17.tgz",
+      "integrity": "sha512-wXR/dYpcqKmfWpEdZjiKJOwCNFndD0DMnrW/cYjVGttEkBfVgcLFHoNrlj47mjOVic9yyNu65alsgF4NQyTa2g==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -14894,9 +16235,9 @@
       "license": "MIT"
     },
     "node_modules/vscode-uri": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/vscode-uri/-/vscode-uri-3.1.0.tgz",
-      "integrity": "sha512-/BpdSx+yCQGnCvecbyXdxHDkuk55/G3xwnC0GqY4gmQ3j+A+g8kzzgB4Nk/SINjqn6+waqw3EgbVF2QKExkRxQ==",
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/vscode-uri/-/vscode-uri-3.2.0.tgz",
+      "integrity": "sha512-m2gXo3bn0G1kT9InzMf07fTbqMbGtyckj3bH5ktLO+1Ssv+yiATZ4dhwaQv9UZWxJh6E9IFGnQyjgWVDWVBDrg==",
       "dev": true,
       "license": "MIT"
     },
@@ -14973,6 +16314,13 @@
         "node": ">=14.17"
       }
     },
+    "node_modules/webpack-virtual-modules": {
+      "version": "0.6.2",
+      "resolved": "https://registry.npmjs.org/webpack-virtual-modules/-/webpack-virtual-modules-0.6.2.tgz",
+      "integrity": "sha512-66/V2i5hQanC51vBQKPH4aI8NMAcBW59FVBs+rC7eGHupMyfn34q7rZIE+ETlJ+XTevqfUhVVBgSUNSW2flEUQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/whatwg-mimetype": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-3.0.0.tgz",
@@ -15212,8 +16560,10 @@
       "devDependencies": {
         "@custom-elements-manifest/analyzer": "^0.11.0",
         "@custom-elements-manifest/to-markdown": "^0.1.0",
+        "@uploadcare/api-emulator": "file:/Users/nd0ut/workspace/uc-586-sync/packages/api-emulator",
         "@uploadcare/file-uploader": "1.34.0",
-        "@vitest/browser-playwright": "^4.1.10",
+        "@vitest/browser-playwright": "^4.1.11",
+        "fast-check": "^4.10.2",
         "lit-analyzer": "^2.0.3",
         "playwright": "^1.49.0",
         "typedoc": "^0.28.19",
@@ -15241,6 +16591,7 @@
       "devDependencies": {
         "@types/react": "^19",
         "@types/react-dom": "^19",
+        "@uploadcare/api-emulator": "file:/Users/nd0ut/workspace/uc-586-sync/packages/api-emulator",
         "react": "^19",
         "react-dom": "^19"
       },
diff --git a/package.json b/package.json
index cbff116..04f4c2f 100644
--- a/package.json
+++ b/package.json
@@ -19,18 +19,22 @@
   ],
   "devDependencies": {
     "@biomejs/biome": "2.2.6",
-    "@vitest/browser-playwright": "^4.1.10",
+    "@microsoft/api-extractor": "^7.59.4",
+    "@mswjs/interceptors": "0.45.7",
+    "@vitest/browser-playwright": "^4.1.11",
+    "esbuild": "^0.28.2",
     "happy-dom": "^20.9.0",
     "husky": "^9.0.11",
     "lerna": "^10.0.1",
     "lint-staged": "^15.2.2",
+    "msw": "3.0.2",
     "typescript": "^5.6.0",
-    "vite": "^6.2.3",
-    "vite-plugin-dts": "^4.5.0",
-    "vitest": "^4.1.10"
+    "vite": "^8.3.3",
+    "vite-plugin-dts": "^5.1.2",
+    "vitest": "^4.1.11"
   },
   "engines": {
-    "node": ">=20"
+    "node": "^20.19.0 || >=22.12.0"
   },
   "license": "MIT",
   "author": "Uploadcare",
@@ -41,5 +45,10 @@
   "homepage": "https://github.com/uploadcare/ai-image-editor#readme",
   "bugs": {
     "url": "https://github.com/uploadcare/ai-image-editor/issues"
+  },
+  "overrides": {
+    "@vitest/mocker": {
+      "msw": "$msw"
+    }
   }
 }
diff --git a/packages/ai-image-editor/.gitignore b/packages/ai-image-editor/.gitignore
index d4ef08f..ceeafeb 100644
--- a/packages/ai-image-editor/.gitignore
+++ b/packages/ai-image-editor/.gitignore
@@ -1,6 +1,6 @@
 
 # Vitest browser failure screenshots (debug artifacts)
-tests/__screenshots__/
+__screenshots__/
 
 # Generated API reference (regenerated by `docs:api`) + VitePress build output
 docs/api/custom-elements.json
diff --git a/packages/ai-image-editor/package.json b/packages/ai-image-editor/package.json
index 7a088a2..057ff87 100644
--- a/packages/ai-image-editor/package.json
+++ b/packages/ai-image-editor/package.json
@@ -32,6 +32,7 @@
     "preview": "vite preview",
     "test": "vitest run",
     "test:watch": "vitest",
+    "test:contract:live": "UC_CONTRACT_TARGET=live vitest run --project contract",
     "docs:api": "cem analyze && node scripts/build-cem-docs.mjs && typedoc && node scripts/clean-typedoc-class.mjs",
     "docs:dev": "npm run docs:api && vitepress dev docs",
     "docs:build": "npm run docs:api && vitepress build docs",
@@ -60,8 +61,10 @@
   "devDependencies": {
     "@custom-elements-manifest/analyzer": "^0.11.0",
     "@custom-elements-manifest/to-markdown": "^0.1.0",
+    "@uploadcare/api-emulator": "file:/Users/nd0ut/workspace/uc-586-sync/packages/api-emulator",
     "@uploadcare/file-uploader": "1.34.0",
-    "@vitest/browser-playwright": "^4.1.10",
+    "@vitest/browser-playwright": "^4.1.11",
+    "fast-check": "^4.10.2",
     "lit-analyzer": "^2.0.3",
     "playwright": "^1.49.0",
     "typedoc": "^0.28.19",
diff --git a/packages/ai-image-editor/src/entities/aspect-ratio/model/aspect-ratio.test.ts b/packages/ai-image-editor/src/entities/aspect-ratio/model/aspect-ratio.test.ts
index 1cb7d7b..1db7639 100644
--- a/packages/ai-image-editor/src/entities/aspect-ratio/model/aspect-ratio.test.ts
+++ b/packages/ai-image-editor/src/entities/aspect-ratio/model/aspect-ratio.test.ts
@@ -1,3 +1,4 @@
+import fc from 'fast-check';
 import { describe, expect, it } from 'vitest';
 import {
   aspectRatioEquals,
@@ -107,6 +108,31 @@ describe('parseAspectRatioList', () => {
     expect(parseAspectRatioList('')).toEqual([]);
     expect(parseAspectRatioList('   ')).toEqual([]);
   });
+
+  /** A side length, as a host might write it: whole or fractional, tiny to huge. */
+  const side = fc.double({ min: 0.001, max: 10_000, noNaN: true });
+  const validRatio = fc.tuple(side, side).filter((ratio) => isValidAspectRatio(ratio));
+  const separator = fc.constantFrom(',', ' ', ', ', ' , ', ',,', '\n', '\t');
+
+  it('reads back any list of valid ratios, in order, whatever separates them', () => {
+    fc.assert(
+      fc.property(fc.array(validRatio), separator, (ratios, sep) => {
+        expect(parseAspectRatioList(ratios.map(aspectRatioKey).join(sep))).toEqual(ratios);
+      }),
+    );
+  });
+
+  it('answers only valid ratios, whatever it is given', () => {
+    // Any string, or "w:h" pairs of any doubles (NaN, ±Infinity, -0, negatives, out of the 10:1 bound).
+    const pairs = fc
+      .array(fc.tuple(fc.double(), fc.double()))
+      .map((list) => list.map(([w, h]) => `${w}:${h}`).join(','));
+    fc.assert(
+      fc.property(fc.oneof(fc.string(), pairs), (input) => {
+        expect(parseAspectRatioList(input).filter((ratio) => !isValidAspectRatio(ratio))).toEqual([]);
+      }),
+    );
+  });
 });
 
 describe('aspectRatioEquals', () => {
@@ -120,10 +146,8 @@ describe('aspectRatioEquals', () => {
 });
 
 describe('POPULAR_ASPECT_RATIOS', () => {
-  it('contains only valid ratios', () => {
-    for (const ratio of POPULAR_ASPECT_RATIOS) {
-      expect(isValidAspectRatio(ratio)).toBe(true);
-    }
+  it.each(POPULAR_ASPECT_RATIOS)('offers %i:%i, a valid ratio', (w, h) => {
+    expect(isValidAspectRatio([w, h])).toBe(true);
   });
 
   it('contains 1:1', () => {
diff --git a/packages/ai-image-editor/src/entities/provider/api/uploadcareApiClient.schemas.dev.test.ts b/packages/ai-image-editor/src/entities/provider/api/uploadcareApiClient.schemas.dev.test.ts
index cbab2ca..ea24fa9 100644
--- a/packages/ai-image-editor/src/entities/provider/api/uploadcareApiClient.schemas.dev.test.ts
+++ b/packages/ai-image-editor/src/entities/provider/api/uploadcareApiClient.schemas.dev.test.ts
@@ -1,10 +1,7 @@
-import { afterEach, describe, expect, it, vi } from 'vitest';
+import { describe, expect, it, vi } from 'vitest';
+import { PRODUCTION_STATUS_SUCCESS } from '../../../../tests/fixtures/production-status-success';
 import { validate } from './uploadcareApiClient.schemas.dev';
 
-afterEach(() => {
-  vi.restoreAllMocks();
-});
-
 describe('uploadcare derivative API dev schema validation', () => {
   it('stays silent for a well-formed generate request body', () => {
     const spy = vi.spyOn(console, 'error').mockImplementation(() => {});
@@ -113,51 +110,9 @@ describe('uploadcare derivative API dev schema validation', () => {
     expect(spy).not.toHaveBeenCalled();
   });
 
-  // A verbatim `derivative/status/` success frame from production (no `type` on
-  // success; image file → image_info + content_info.image present, video_info null).
   it('stays silent for a real derivative status success frame', () => {
     const spy = vi.spyOn(console, 'error').mockImplementation(() => {});
-    validate('status', {
-      size: 1620930,
-      total: 1620930,
-      done: 1620930,
-      uuid: '2e0c4294-32e0-4999-aed1-e78221224339',
-      file_id: '2e0c4294-32e0-4999-aed1-e78221224339',
-      original_filename: 'generated.png',
-      is_image: true,
-      is_stored: false,
-      image_info: {
-        dpi: null,
-        width: 1248,
-        format: 'PNG',
-        height: 832,
-        sequence: false,
-        color_mode: 'RGB',
-        orientation: null,
-        geo_location: null,
-        datetime_original: null,
-      },
-      video_info: null,
-      content_info: {
-        mime: { mime: 'image/png', type: 'image', subtype: 'png' },
-        image: {
-          dpi: null,
-          width: 1248,
-          format: 'PNG',
-          height: 832,
-          sequence: false,
-          color_mode: 'RGB',
-          orientation: null,
-          geo_location: null,
-          datetime_original: null,
-        },
-      },
-      is_ready: true,
-      filename: 'generated.png',
-      mime_type: 'image/png',
-      metadata: {},
-      status: 'success',
-    });
+    validate('status', PRODUCTION_STATUS_SUCCESS);
     expect(spy).not.toHaveBeenCalled();
   });
 
diff --git a/packages/ai-image-editor/src/entities/provider/api/uploadcareApiClient.test.ts b/packages/ai-image-editor/src/entities/provider/api/uploadcareApiClient.test.ts
index c61603c..6ecd61b 100644
--- a/packages/ai-image-editor/src/entities/provider/api/uploadcareApiClient.test.ts
+++ b/packages/ai-image-editor/src/entities/provider/api/uploadcareApiClient.test.ts
@@ -1,14 +1,16 @@
+import { DEMO_IMAGE_UUID, mintAuthToken } from '@uploadcare/api-emulator';
 import { describe, expect, it, vi } from 'vitest';
+import { requestsTo, session } from '../../../../tests/specs/setup';
 import { AiProviderError } from '../model/types';
 import { UploadcareApiClient } from './uploadcareApiClient';
 
-function jsonResponse(body: unknown, init: ResponseInit = {}): Response {
-  return new Response(JSON.stringify(body), {
-    status: 200,
-    headers: { 'Content-Type': 'application/json' },
-    ...init,
-  });
-}
+const PUBLIC_KEY = 'demopublickey';
+const GENERATE = 'POST /derivative/image/generate/';
+const EDIT = 'POST /derivative/image/edit/';
+const STATUS = 'GET /derivative/status/';
+
+/** Answers nothing, ever: a request to `route` stays in flight until its caller aborts it. */
+const hang = (route: string) => session.on(route, () => new Promise<never>(() => {}));
 
 describe('UploadcareApiClient', () => {
   it('throws when publicKey is missing', () => {
@@ -16,55 +18,48 @@ describe('UploadcareApiClient', () => {
   });
 
   describe('authToken', () => {
-    const headersOf = (call: unknown) => new Headers((call as [string, RequestInit])[1].headers);
-
     it('sends no Authorization header when unset', async () => {
-      const fetchImpl = vi.fn<typeof fetch>().mockResolvedValue(jsonResponse({ type: 'job', job_id: 'j' }));
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl });
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
 
       await client.generate({ prompt: 'x', aspectRatio: [1, 1], filename: 'f.png' });
 
-      expect(headersOf(fetchImpl.mock.calls[0]!).has('Authorization')).toBe(false);
+      expect(requestsTo(GENERATE)[0].headers.get('Authorization')).toBeNull();
     });
 
     it('sends a plain token as a bearer header', async () => {
-      const fetchImpl = vi.fn<typeof fetch>().mockResolvedValue(jsonResponse({ type: 'job', job_id: 'j' }));
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl, authToken: 'eyJ' });
+      const token = await mintAuthToken();
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY, authToken: token });
 
       await client.generate({ prompt: 'x', aspectRatio: [1, 1], filename: 'f.png' });
 
-      expect(headersOf(fetchImpl.mock.calls[0]!).get('Authorization')).toBe('Bearer eyJ');
+      expect(requestsTo(GENERATE)[0].headers.get('Authorization')).toBe(`Bearer ${token}`);
     });
 
     it('re-resolves a resolver per request, so a job can rotate tokens mid-flight', async () => {
-      const fetchImpl = vi
-        .fn<typeof fetch>()
-        .mockResolvedValueOnce(jsonResponse({ type: 'job', job_id: 'j' }))
-        .mockResolvedValueOnce(jsonResponse({ type: 'status', status: 'pending' }));
-      const authToken = vi.fn().mockResolvedValueOnce('first').mockResolvedValueOnce('second');
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl, authToken });
+      const [first, second] = [await mintAuthToken({ tokenId: 'first' }), await mintAuthToken({ tokenId: 'second' })];
+      const authToken = vi.fn().mockResolvedValueOnce(first).mockResolvedValueOnce(second);
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY, authToken });
 
-      await client.generate({ prompt: 'x', aspectRatio: [1, 1], filename: 'f.png' });
-      await client.getJobStatus('j');
+      const { job_id } = await client.generate({ prompt: 'x', aspectRatio: [1, 1], filename: 'f.png' });
+      await client.getJobStatus(job_id!);
 
-      expect(headersOf(fetchImpl.mock.calls[0]!).get('Authorization')).toBe('Bearer first');
-      expect(headersOf(fetchImpl.mock.calls[1]!).get('Authorization')).toBe('Bearer second');
+      expect(requestsTo(GENERATE)[0].headers.get('Authorization')).toBe(`Bearer ${first}`);
+      expect(requestsTo(STATUS)[0].headers.get('Authorization')).toBe(`Bearer ${second}`);
     });
   });
 
   describe('generate', () => {
     it('POSTs pub_key + prompt + aspect_ratio + filename and returns the job', async () => {
-      const fetchImpl = vi.fn<typeof fetch>().mockResolvedValue(jsonResponse({ type: 'job', job_id: 'job-1' }));
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl });
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
 
       const job = await client.generate({ prompt: 'a hat', aspectRatio: [16, 9], filename: 'generated.png' });
 
-      expect(job).toEqual({ type: 'job', job_id: 'job-1' });
-      const [url, init] = fetchImpl.mock.calls[0]! as [string, RequestInit];
-      expect(url).toBe('https://upload.uploadcare.com/derivative/image/generate/');
-      expect(init.method).toBe('POST');
-      expect(JSON.parse(init.body as string)).toMatchObject({
-        pub_key: 'pk',
+      expect(job).toEqual({ type: 'job', job_id: expect.any(String) });
+      expect(requestsTo(GENERATE)).toHaveLength(1);
+      const [sent] = requestsTo(GENERATE);
+      expect(sent.url).toBe('https://upload.uploadcare.com/derivative/image/generate/');
+      expect(await sent.json()).toMatchObject({
+        pub_key: PUBLIC_KEY,
         prompt: 'a hat',
         aspect_ratio: [16, 9],
         filename: 'generated.png',
@@ -72,194 +67,204 @@ describe('UploadcareApiClient', () => {
     });
 
     it('includes store only when provided', async () => {
-      const fetchImpl = vi.fn<typeof fetch>().mockResolvedValue(jsonResponse({ type: 'job', job_id: 'j' }));
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl });
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
+
+      await client.generate({ prompt: 'x', aspectRatio: [1, 1], filename: 'f.png' });
       await client.generate({ prompt: 'x', aspectRatio: [1, 1], filename: 'f.png', store: true });
-      const [, init] = fetchImpl.mock.calls[0]! as [string, RequestInit];
-      expect(JSON.parse(init.body as string).store).toBe(true);
+
+      expect((await requestsTo(GENERATE)[0].json()).store).toBeUndefined();
+      expect((await requestsTo(GENERATE)[1].json()).store).toBe(true);
     });
 
     it('includes metadata only when provided', async () => {
-      const fetchImpl = vi
-        .fn<typeof fetch>()
-        .mockImplementation(async () => jsonResponse({ type: 'job', job_id: 'j' }));
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl });
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
 
       await client.generate({ prompt: 'x', aspectRatio: [1, 1], filename: 'f.png' });
-      expect(JSON.parse((fetchImpl.mock.calls[0]![1] as RequestInit).body as string).metadata).toBeUndefined();
-
       await client.generate({
         prompt: 'x',
         aspectRatio: [1, 1],
         filename: 'f.png',
         metadata: { source: 'ai-image-editor' },
       });
-      expect(JSON.parse((fetchImpl.mock.calls[1]![1] as RequestInit).body as string).metadata).toEqual({
-        source: 'ai-image-editor',
-      });
+
+      expect((await requestsTo(GENERATE)[0].json()).metadata).toBeUndefined();
+      expect((await requestsTo(GENERATE)[1].json()).metadata).toEqual({ source: 'ai-image-editor' });
     });
 
     it('honours baseUrl override', async () => {
-      const fetchImpl = vi.fn<typeof fetch>().mockResolvedValue(jsonResponse({ type: 'job', job_id: 'j' }));
       const client = new UploadcareApiClient({
-        publicKey: 'pk',
+        publicKey: PUBLIC_KEY,
         baseUrl: 'https://upload.example.com/',
-        fetch: fetchImpl,
       });
       await client.generate({ prompt: 'x', aspectRatio: [1, 1], filename: 'f.png' });
-      const [url] = fetchImpl.mock.calls[0]! as [string, RequestInit];
-      expect(url).toBe('https://upload.example.com/derivative/image/generate/');
+      expect(requestsTo(GENERATE)[0].url).toBe('https://upload.example.com/derivative/image/generate/');
     });
 
-    it('throws with status text on non-2xx', async () => {
-      const fetchImpl = vi
-        .fn<typeof fetch>()
-        .mockResolvedValue(new Response('bad ratio', { status: 400, statusText: 'Bad Request' }));
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl });
+    it('throws with status text on a non-2xx response that is not the error envelope', async () => {
+      session.on(
+        'POST /derivative/image/generate/',
+        () => new Response('upstream failure', { status: 400, statusText: 'Bad Request' }),
+      );
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
       await expect(client.generate({ prompt: 'x', aspectRatio: [1, 1], filename: 'f.png' })).rejects.toThrow(/400/);
     });
 
-    it('forwards the abort signal', async () => {
-      const fetchImpl = vi.fn<typeof fetch>().mockImplementation(async (_url, init) => {
-        expect(init?.signal).toBeInstanceOf(AbortSignal);
-        return jsonResponse({ type: 'job', job_id: 'j' });
-      });
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl });
+    it('gives up on a hanging request when the caller aborts', async () => {
+      hang(GENERATE);
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
       const controller = new AbortController();
-      await client.generate({ prompt: 'x', aspectRatio: [1, 1], filename: 'f.png', signal: controller.signal });
+
+      const pending = client.generate({
+        prompt: 'x',
+        aspectRatio: [1, 1],
+        filename: 'f.png',
+        signal: controller.signal,
+      });
+      await vi.waitFor(() => expect(requestsTo(GENERATE)).toHaveLength(1));
+      controller.abort();
+
+      await expect(pending).rejects.toMatchObject({ name: 'AbortError' });
     });
 
     it('sends Accept: application/json', async () => {
-      const fetchImpl = vi.fn<typeof fetch>().mockResolvedValue(jsonResponse({ type: 'job', job_id: 'j' }));
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl });
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
       await client.generate({ prompt: 'x', aspectRatio: [1, 1], filename: 'f.png' });
-      const [, init] = fetchImpl.mock.calls[0]! as [string, RequestInit];
-      expect((init.headers as Record<string, string>).Accept).toBe('application/json');
+      expect(requestsTo(GENERATE)[0].headers.get('Accept')).toBe('application/json');
     });
 
     it('surfaces a platform error envelope as an AiProviderError with its code', async () => {
-      const fetchImpl = vi.fn<typeof fetch>().mockResolvedValue(
-        jsonResponse({
-          error: { status_code: 400, error_code: 'canvas_too_large', content: 'Canvas size exceeds the 4MP limit.' },
-        }),
-      );
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl });
+      session.use('derivativesDisabled');
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
       await expect(client.generate({ prompt: 'x', aspectRatio: [1, 1], filename: 'f.png' })).rejects.toMatchObject({
         name: 'AiProviderError',
-        errorCode: 'canvas_too_large',
-        message: 'Canvas size exceeds the 4MP limit.',
+        errorCode: 'derivative_disabled',
+        message: 'Derivatives are not enabled for this project.',
       });
     });
   });
 
   describe('edit', () => {
     it('POSTs pub_key + prompt + source uuid + filename to the edit endpoint', async () => {
-      const fetchImpl = vi.fn<typeof fetch>().mockResolvedValue(jsonResponse({ type: 'job', job_id: 'job-e' }));
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl });
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
 
-      const job = await client.edit({ prompt: 'remove the cat', source: 'src-uuid', filename: 'edited.png' });
+      const job = await client.edit({ prompt: 'remove the cat', source: DEMO_IMAGE_UUID, filename: 'edited.png' });
 
-      expect(job).toEqual({ type: 'job', job_id: 'job-e' });
-      const [url, init] = fetchImpl.mock.calls[0]! as [string, RequestInit];
-      expect(url).toBe('https://upload.uploadcare.com/derivative/image/edit/');
-      expect(init.method).toBe('POST');
-      expect(JSON.parse(init.body as string)).toMatchObject({
-        pub_key: 'pk',
+      expect(job).toEqual({ type: 'job', job_id: expect.any(String) });
+      expect(requestsTo(EDIT)).toHaveLength(1);
+      const [sent] = requestsTo(EDIT);
+      expect(sent.url).toBe('https://upload.uploadcare.com/derivative/image/edit/');
+      expect(await sent.json()).toMatchObject({
+        pub_key: PUBLIC_KEY,
         prompt: 'remove the cat',
-        source: 'src-uuid',
+        source: DEMO_IMAGE_UUID,
         filename: 'edited.png',
       });
     });
 
     it('includes aspect_ratio only when provided', async () => {
-      // Fresh Response per call — a single shared Response body can be read once.
-      const fetchImpl = vi
-        .fn<typeof fetch>()
-        .mockImplementation(async () => jsonResponse({ type: 'job', job_id: 'j' }));
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl });
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
 
-      await client.edit({ prompt: 'x', source: 'u', filename: 'f.png' });
-      expect(JSON.parse((fetchImpl.mock.calls[0]![1] as RequestInit).body as string).aspect_ratio).toBeUndefined();
+      await client.edit({ prompt: 'x', source: DEMO_IMAGE_UUID, filename: 'f.png' });
+      await client.edit({ prompt: 'x', source: DEMO_IMAGE_UUID, filename: 'f.png', aspectRatio: [16, 9] });
 
-      await client.edit({ prompt: 'x', source: 'u', filename: 'f.png', aspectRatio: [16, 9] });
-      expect(JSON.parse((fetchImpl.mock.calls[1]![1] as RequestInit).body as string).aspect_ratio).toEqual([16, 9]);
+      expect((await requestsTo(EDIT)[0].json()).aspect_ratio).toBeUndefined();
+      expect((await requestsTo(EDIT)[1].json()).aspect_ratio).toEqual([16, 9]);
     });
 
     it('includes metadata only when provided', async () => {
-      const fetchImpl = vi
-        .fn<typeof fetch>()
-        .mockImplementation(async () => jsonResponse({ type: 'job', job_id: 'j' }));
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl });
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
+
+      await client.edit({ prompt: 'x', source: DEMO_IMAGE_UUID, filename: 'f.png' });
+      await client.edit({
+        prompt: 'x',
+        source: DEMO_IMAGE_UUID,
+        filename: 'f.png',
+        metadata: { source: 'ai-image-editor' },
+      });
 
-      await client.edit({ prompt: 'x', source: 'u', filename: 'f.png' });
-      expect(JSON.parse((fetchImpl.mock.calls[0]![1] as RequestInit).body as string).metadata).toBeUndefined();
+      expect((await requestsTo(EDIT)[0].json()).metadata).toBeUndefined();
+      expect((await requestsTo(EDIT)[1].json()).metadata).toEqual({ source: 'ai-image-editor' });
+    });
 
-      await client.edit({ prompt: 'x', source: 'u', filename: 'f.png', metadata: { source: 'ai-image-editor' } });
-      expect(JSON.parse((fetchImpl.mock.calls[1]![1] as RequestInit).body as string).metadata).toEqual({
-        source: 'ai-image-editor',
+    it('surfaces a source the project does not have as an AiProviderError', async () => {
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
+      await expect(client.edit({ prompt: 'x', source: 'missing', filename: 'f.png' })).rejects.toMatchObject({
+        name: 'AiProviderError',
+        errorCode: 'source_not_found',
       });
     });
 
-    it('throws with status text on non-2xx', async () => {
-      const fetchImpl = vi
-        .fn<typeof fetch>()
-        .mockResolvedValue(new Response('bad source', { status: 400, statusText: 'Bad Request' }));
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl });
+    it('throws with status text on a non-2xx response that is not the error envelope', async () => {
+      session.on(
+        'POST /derivative/image/edit/',
+        () => new Response('upstream failure', { status: 400, statusText: 'Bad Request' }),
+      );
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
       await expect(client.edit({ prompt: 'x', source: 'u', filename: 'f.png' })).rejects.toThrow(/400/);
     });
 
-    it('forwards the abort signal', async () => {
-      const fetchImpl = vi.fn<typeof fetch>().mockImplementation(async (_url, init) => {
-        expect(init?.signal).toBeInstanceOf(AbortSignal);
-        return jsonResponse({ type: 'job', job_id: 'j' });
-      });
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl });
+    it('gives up on a hanging request when the caller aborts', async () => {
+      hang(EDIT);
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
       const controller = new AbortController();
-      await client.edit({ prompt: 'x', source: 'u', filename: 'f.png', signal: controller.signal });
+
+      const pending = client.edit({
+        prompt: 'x',
+        source: DEMO_IMAGE_UUID,
+        filename: 'f.png',
+        signal: controller.signal,
+      });
+      await vi.waitFor(() => expect(requestsTo(EDIT)).toHaveLength(1));
+      controller.abort();
+
+      await expect(pending).rejects.toMatchObject({ name: 'AbortError' });
     });
   });
 
   describe('getJobStatus', () => {
+    const startJob = async (client: UploadcareApiClient) =>
+      (await client.generate({ prompt: 'x', aspectRatio: [1, 1], filename: 'f.png' })).job_id!;
+
     it('GETs the status endpoint with pub_key + job_id and returns the parsed status', async () => {
-      const fetchImpl = vi.fn<typeof fetch>().mockResolvedValue(jsonResponse({ type: 'job', status: 'processing' }));
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl });
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
+      const jobId = await startJob(client);
 
-      const status = await client.getJobStatus('job-42');
+      const status = await client.getJobStatus(jobId);
 
       expect(status).toEqual({ type: 'job', status: 'processing' });
-      const [url, init] = fetchImpl.mock.calls[0]! as [string, RequestInit];
-      expect(url).toBe('https://upload.uploadcare.com/derivative/status/?pub_key=pk&job_id=job-42');
-      expect((init?.method ?? 'GET').toUpperCase()).toBe('GET');
+      expect(requestsTo(STATUS)).toHaveLength(1);
+      expect(requestsTo(STATUS)[0].url).toBe(
+        `https://upload.uploadcare.com/derivative/status/?pub_key=${PUBLIC_KEY}&job_id=${jobId}`,
+      );
     });
 
-    it('throws with status text on non-2xx', async () => {
-      const fetchImpl = vi
-        .fn<typeof fetch>()
-        .mockResolvedValue(new Response('nope', { status: 404, statusText: 'Not Found' }));
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl });
+    it('throws with status text on a non-2xx response that is not the error envelope', async () => {
+      session.on(
+        'GET /derivative/status/',
+        () => new Response('upstream failure', { status: 404, statusText: 'Not Found' }),
+      );
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
       await expect(client.getJobStatus('job-1')).rejects.toThrow(/404/);
     });
 
     it('surfaces a platform error envelope (e.g. job_not_found) as an AiProviderError', async () => {
-      const fetchImpl = vi.fn<typeof fetch>().mockResolvedValue(
-        jsonResponse({
-          error: { status_code: 404, error_code: 'job_not_found', content: 'Derivative job is not found.' },
-        }),
-      );
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl });
-      const err = await client.getJobStatus('job-1').catch((e) => e);
-      expect(err).toBeInstanceOf(AiProviderError);
-      expect(err.errorCode).toBe('job_not_found');
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
+      const pending = client.getJobStatus('job-1');
+      await expect(pending).rejects.toBeInstanceOf(AiProviderError);
+      await expect(pending).rejects.toMatchObject({ errorCode: 'job_not_found' });
     });
 
-    it('forwards the abort signal', async () => {
-      const fetchImpl = vi.fn<typeof fetch>().mockImplementation(async (_url, init) => {
-        expect(init?.signal).toBeInstanceOf(AbortSignal);
-        return jsonResponse({ type: 'job', status: 'processing' });
-      });
-      const client = new UploadcareApiClient({ publicKey: 'pk', fetch: fetchImpl });
+    it('gives up on a hanging request when the caller aborts', async () => {
+      hang(STATUS);
+      const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
+      const jobId = await startJob(client);
       const controller = new AbortController();
-      await client.getJobStatus('job-1', controller.signal);
+
+      const pending = client.getJobStatus(jobId, controller.signal);
+      await vi.waitFor(() => expect(requestsTo(STATUS)).toHaveLength(1));
+      controller.abort();
+
+      await expect(pending).rejects.toMatchObject({ name: 'AbortError' });
     });
   });
 });
diff --git a/packages/ai-image-editor/src/entities/provider/api/uploadcareApiClient.ts b/packages/ai-image-editor/src/entities/provider/api/uploadcareApiClient.ts
index ef0bdbf..9a716b1 100644
--- a/packages/ai-image-editor/src/entities/provider/api/uploadcareApiClient.ts
+++ b/packages/ai-image-editor/src/entities/provider/api/uploadcareApiClient.ts
@@ -21,8 +21,6 @@ export type UploadcareApiClientOptions = {
   publicKey: string;
   /** Base URL for the upload API. Defaults to https://upload.uploadcare.com. */
   baseUrl?: string;
-  /** Override the global fetch — useful for tests. */
-  fetch?: typeof fetch;
   /**
    * JWT for the `Authorization: Bearer` scheme. A plain token, or a resolver
    * called before every request so a long-running job can rotate tokens
@@ -154,6 +152,12 @@ async function readJson(response: Response, action: string): Promise<unknown> {
       `Uploadcare ${action} failed (${response.status} ${response.statusText})${text ? `: ${text}` : ''}`,
     );
   }
+  // Every derivative endpoint answers a JSON object; anything else (a proxy's HTML page, an empty body) is a failure.
+  if (data === null || typeof data !== 'object') {
+    throw new Error(
+      `Uploadcare ${action} failed (${response.status}): the response is not a JSON object${text ? `: ${text}` : ''}`,
+    );
+  }
   return data;
 }
 
@@ -161,7 +165,6 @@ async function readJson(response: Response, action: string): Promise<unknown> {
 export class UploadcareApiClient {
   private readonly publicKey: string;
   private readonly baseUrl: string;
-  private readonly doFetch: typeof fetch;
   private readonly authToken: AuthToken | undefined;
 
   constructor(options: UploadcareApiClientOptions) {
@@ -170,7 +173,6 @@ export class UploadcareApiClient {
     }
     this.publicKey = options.publicKey;
     this.baseUrl = options.baseUrl ?? 'https://upload.uploadcare.com';
-    this.doFetch = options.fetch ?? globalThis.fetch.bind(globalThis);
     this.authToken = options.authToken;
   }
 
@@ -211,7 +213,7 @@ export class UploadcareApiClient {
     url.searchParams.set('pub_key', this.publicKey);
     url.searchParams.set('job_id', jobId);
 
-    const response = await this.doFetch(url.href, {
+    const response = await fetch(url.href, {
       method: 'GET',
       headers: { Accept: 'application/json', ...(await this.authHeaders()) },
       signal,
@@ -233,7 +235,7 @@ export class UploadcareApiClient {
     action: string,
     signal?: AbortSignal,
   ): Promise<UploadcareJobResponse> {
-    const response = await this.doFetch(endpoint.href, {
+    const response = await fetch(endpoint.href, {
       method: 'POST',
       headers: {
         'Content-Type': 'application/json',
diff --git a/packages/ai-image-editor/src/entities/provider/api/uploadcareDerivativeApi.test.ts b/packages/ai-image-editor/src/entities/provider/api/uploadcareDerivativeApi.test.ts
index b95932c..4ba402f 100644
--- a/packages/ai-image-editor/src/entities/provider/api/uploadcareDerivativeApi.test.ts
+++ b/packages/ai-image-editor/src/entities/provider/api/uploadcareDerivativeApi.test.ts
@@ -1,452 +1,470 @@
+import { DEMO_IMAGE_UUID, mintAuthToken } from '@uploadcare/api-emulator';
 import { getPrefixedCdnBaseAsync } from '@uploadcare/cname-prefix/async';
-import { isReadyPoll } from '@uploadcare/upload-client';
-import { afterEach, describe, expect, it, vi } from 'vitest';
+import type { UploadcareFile } from '@uploadcare/upload-client';
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { requestsTo, session } from '../../../../tests/specs/setup';
 import { AiProviderError } from '../model/types';
 import { UploadcareDerivativeApi } from './uploadcareDerivativeApi';
 
-// Keep the real UploadcareFile (used to wrap results) but stub the `isReadyPoll`
-// network call (used by getFileInfo) so it's exercised without the Upload API.
-vi.mock('@uploadcare/upload-client', async (importActual) => {
-  const actual = await importActual<typeof import('@uploadcare/upload-client')>();
-  return { ...actual, isReadyPoll: vi.fn() };
-});
-const mockIsReadyPoll = vi.mocked(isReadyPoll);
+const PUBLIC_KEY = 'demopublickey';
+const CDN = 'https://cdn.example.com';
+const NO_DELAY = { pollIntervalMs: 0 } as const;
+const GENERATE = 'POST /derivative/image/generate/';
+const EDIT = 'POST /derivative/image/edit/';
+const STATUS = 'GET /derivative/status/';
 
-function jsonResponse(body: unknown, init: ResponseInit = {}): Response {
-  return new Response(JSON.stringify(body), {
-    status: 200,
-    headers: { 'Content-Type': 'application/json' },
-    ...init,
-  });
-}
-
-function readSentBody(init: RequestInit | undefined): Record<string, unknown> {
-  return JSON.parse(init?.body as string) as Record<string, unknown>;
-}
-
-/**
- * A complete `derivative/status/` success frame minus `uuid` and `status` (which
- * every test sets). Merged under each success fixture so the strict dev-schema
- * validates them and the readiness poll ends — tests set only what they assert.
- */
-const SUCCESS_FRAME_DEFAULTS = {
-  file_id: '',
-  size: 0,
-  done: 0,
-  total: 0,
-  original_filename: '',
-  filename: '',
-  mime_type: 'image/png',
-  is_image: true,
-  is_stored: false,
-  is_ready: true,
-  image_info: null,
-  video_info: null,
-  content_info: null,
-  metadata: {},
-} as const;
-
-/**
- * Builds a fetch mock that answers the generate POST with `jobResponse` and
- * then walks through `statuses` on each successive status GET.
- */
-function routedFetch(jobResponse: unknown, statuses: unknown[]): ReturnType<typeof vi.fn<typeof fetch>> {
-  let statusIndex = 0;
-  return vi.fn<typeof fetch>().mockImplementation(async (url, init) => {
-    const method = (init?.method ?? 'GET').toUpperCase();
-    if (method === 'POST') return jsonResponse(jobResponse);
-    const body = statuses[Math.min(statusIndex, statuses.length - 1)];
-    statusIndex += 1;
-    void url;
-    const frame =
-      body && typeof body === 'object' && 'status' in body && body.status === 'success'
-        ? { ...SUCCESS_FRAME_DEFAULTS, ...body }
-        : body;
-    return jsonResponse(frame);
-  });
-}
+/** A result's width over its height. */
+const ratioOf = (file: UploadcareFile) =>
+  (file.imageInfo?.width ?? Number.NaN) / (file.imageInfo?.height ?? Number.NaN);
 
-const NO_DELAY = { pollIntervalMs: 0 } as const;
+/** Answers nothing, ever: a request to `route` stays in flight until its caller aborts it. */
+const hang = (route: string) => session.on(route, () => new Promise<never>(() => {}));
+
+/** A job that never finishes: every status poll answers `processing`. */
+const neverFinish = () => session.on(STATUS, () => Response.json({ type: 'job', status: 'processing' }));
 
 describe('UploadcareDerivativeApi', () => {
   it('throws when publicKey is missing', () => {
     expect(() => new UploadcareDerivativeApi({ publicKey: '' })).toThrow(/publicKey/);
   });
 
-  it('POSTs the prompt + aspect ratio + pub_key to the derivative endpoint', async () => {
-    const fetchImpl = routedFetch({ type: 'job', job_id: 'job-1' }, [{ status: 'success', uuid: 'abc-123' }]);
-    const provider = new UploadcareDerivativeApi({ publicKey: 'pk_test', fetch: fetchImpl, ...NO_DELAY });
-    await provider.generate({ prompt: 'a hat', mode: 'generate', aspectRatio: [16, 9] });
-
-    const [url, init] = fetchImpl.mock.calls[0]! as [string, RequestInit];
-    expect(url).toBe('https://upload.uploadcare.com/derivative/image/generate/');
-    expect(init.method).toBe('POST');
-    expect((init.headers as Record<string, string>)['Content-Type']).toBe('application/json');
-    expect(readSentBody(init)).toMatchObject({
-      pub_key: 'pk_test',
-      prompt: 'a hat',
-      aspect_ratio: [16, 9],
-      filename: 'generated.png',
-    });
+  it('generates an image at the requested aspect ratio', async () => {
+    const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, ...NO_DELAY });
+    const { file } = await provider.generate({ prompt: 'a hat', mode: 'generate', aspectRatio: [16, 9] });
+    expect(ratioOf(file)).toBe(16 / 9);
+  });
+
+  it('names the result generated.png when no filename is given', async () => {
+    const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, ...NO_DELAY });
+    const { file } = await provider.generate({ prompt: 'x', mode: 'generate' });
+    expect(file.originalFilename).toBe('generated.png');
   });
 
   it('forwards request metadata to the generate endpoint', async () => {
-    const fetchImpl = routedFetch({ type: 'job', job_id: 'job-1' }, [{ status: 'success', uuid: 'abc-123' }]);
-    const provider = new UploadcareDerivativeApi({ publicKey: 'pk', fetch: fetchImpl, ...NO_DELAY });
+    const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, ...NO_DELAY });
     await provider.generate({ prompt: 'x', mode: 'generate', metadata: { source: 'ai-image-editor' } });
-    const [, init] = fetchImpl.mock.calls[0]! as [string, RequestInit];
-    expect(readSentBody(init).metadata).toEqual({ source: 'ai-image-editor' });
+    expect((await requestsTo(GENERATE)[0].json()).metadata).toEqual({ source: 'ai-image-editor' });
   });
 
   it('forwards request metadata to the edit endpoint', async () => {
-    const fetchImpl = routedFetch({ type: 'job', job_id: 'job-e' }, [{ status: 'success', uuid: 'edited' }]);
-    const provider = new UploadcareDerivativeApi({ publicKey: 'pk', fetch: fetchImpl, ...NO_DELAY });
-    await provider.generate({ prompt: 'x', mode: 'edit', source: 'src', metadata: { source: 'ai-image-editor' } });
-    const [url, init] = fetchImpl.mock.calls[0]! as [string, RequestInit];
-    expect(url).toBe('https://upload.uploadcare.com/derivative/image/edit/');
-    expect(readSentBody(init).metadata).toEqual({ source: 'ai-image-editor' });
+    const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, ...NO_DELAY });
+    await provider.generate({
+      prompt: 'x',
+      mode: 'edit',
+      source: DEMO_IMAGE_UUID,
+      metadata: { source: 'ai-image-editor' },
+    });
+    expect((await requestsTo(EDIT)[0].json()).metadata).toEqual({ source: 'ai-image-editor' });
   });
 
-  it('uses 1:1 when aspectRatio is missing or invalid', async () => {
-    const fetchImpl = routedFetch({ type: 'job', job_id: 'job-1' }, [{ status: 'success', uuid: 'abc-123' }]);
-    const provider = new UploadcareDerivativeApi({ publicKey: 'pk', fetch: fetchImpl, ...NO_DELAY });
-    await provider.generate({ prompt: 'x', mode: 'generate' });
-    const [, init] = fetchImpl.mock.calls[0]! as [string, RequestInit];
-    expect(readSentBody(init).aspect_ratio).toEqual([1, 1]);
+  it.each([
+    ['missing', undefined],
+    ['not positive', [0, 1]],
+    ['wider than 10:1', [20, 1]],
+  ] as const)('generates a square image when aspectRatio is %s', async (_, aspectRatio) => {
+    const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, ...NO_DELAY });
+    const { file } = await provider.generate({
+      prompt: 'x',
+      mode: 'generate',
+      aspectRatio: aspectRatio && [...aspectRatio],
+    });
+    expect(ratioOf(file)).toBe(1);
   });
 
-  it('polls the status endpoint with pub_key + job_id until the job succeeds', async () => {
-    const fetchImpl = routedFetch({ type: 'job', job_id: 'job-42' }, [
-      { type: 'job', status: 'processing' },
-      { type: 'job', status: 'uploading' },
-      { status: 'success', uuid: 'final-uuid' },
-    ]);
-    const provider = new UploadcareDerivativeApi({
-      publicKey: 'pk',
-      cdnBaseUrl: 'https://cdn.example.com',
-      fetch: fetchImpl,
-      ...NO_DELAY,
+  it('keeps polling through processing, uploading and an unready success until is_ready', async () => {
+    // Oldest first: the emulator's own frames, walked straight to ready.
+    session.use('derivativesInstant');
+    session.on(STATUS, async ({ next }) => Response.json({ ...(await (await next())?.json()), is_ready: false }), {
+      times: 1,
     });
+    session.on(STATUS, () => Response.json({ type: 'job', status: 'uploading' }), { times: 1 });
+    session.on(STATUS, () => Response.json({ type: 'job', status: 'processing' }), { times: 1 });
+    const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, cdnBaseUrl: CDN, ...NO_DELAY });
 
     const result = await provider.generate({ prompt: 'x', mode: 'generate' });
 
-    expect(result.url).toBe('https://cdn.example.com/final-uuid/');
-    // 1 POST + 3 status polls
-    expect(fetchImpl).toHaveBeenCalledTimes(4);
-    const [statusUrl, statusInit] = fetchImpl.mock.calls[1]! as [string, RequestInit];
-    expect(statusUrl).toBe('https://upload.uploadcare.com/derivative/status/?pub_key=pk&job_id=job-42');
-    expect((statusInit?.method ?? 'GET').toUpperCase()).toBe('GET');
+    expect(result.url).toBe(`${CDN}/${result.uuid}/`);
+    // processing, uploading, unready success, ready success: one poll each, none after.
+    expect(requestsTo(STATUS)).toHaveLength(4);
   });
 
   it('throws when the job ends in an error status', async () => {
-    const fetchImpl = routedFetch({ type: 'job', job_id: 'job-err' }, [
-      { type: 'job', status: 'processing' },
-      { type: 'job', status: 'error', error_source: 'ai_gateway', error_code: 'content_policy', error: 'blocked' },
-    ]);
-    const provider = new UploadcareDerivativeApi({ publicKey: 'pk', fetch: fetchImpl, ...NO_DELAY });
-    await expect(provider.generate({ prompt: 'x', mode: 'generate' })).rejects.toThrow(/content_policy|blocked/);
+    session.use('derivativeFailure', { code: 'content_moderated' });
+    const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, ...NO_DELAY });
+    await expect(provider.generate({ prompt: 'x', mode: 'generate' })).rejects.toMatchObject({
+      name: 'AiProviderError',
+      errorCode: 'content_moderated',
+    });
   });
 
   it('wraps an internal poll timeout as a generation_timeout provider error', async () => {
-    // Never-successful status + a zero timeout: `poll` gives up on its own,
-    // without the caller's signal ever aborting.
-    const fetchImpl = routedFetch({ type: 'job', job_id: 'job-slow' }, [{ type: 'job', status: 'processing' }]);
+    // A zero timeout: `poll` gives up on its own, without the caller's signal ever aborting.
+    neverFinish();
+    let jobId: string | undefined;
+    session.on('POST /derivative/image/generate/', async ({ next }) => {
+      const answer = await next();
+      jobId = (await answer?.clone().json())?.job_id;
+      return answer;
+    });
     const provider = new UploadcareDerivativeApi({
-      publicKey: 'pk',
-      fetch: fetchImpl,
+      publicKey: PUBLIC_KEY,
       pollIntervalMs: 0,
       pollTimeoutMs: 0,
     });
-    const err = await provider.generate({ prompt: 'x', mode: 'generate' }).catch((e) => e);
-    expect(err).toBeInstanceOf(AiProviderError);
-    expect(err.errorCode).toBe('generation_timeout');
-    expect(err.message).toContain('job-slow');
+    const pending = provider.generate({ prompt: 'x', mode: 'generate' });
+    await expect(pending).rejects.toBeInstanceOf(AiProviderError);
+    await expect(pending).rejects.toMatchObject({ errorCode: 'generation_timeout' });
+    expect(jobId).toEqual(expect.any(String));
+    await expect(pending).rejects.toThrow(jobId);
+  });
+
+  describe('when a status poll fails mid-job', () => {
+    /** The job's status polls, in order. */
+    const statusPolls = () => requestsTo(STATUS);
+
+    /** The job's first poll answers `processing`; the next one answers `failure`. */
+    const failSecondPoll = (failure: () => Response) => {
+      session.on(STATUS, failure, { times: 1 });
+      session.on(STATUS, () => Response.json({ type: 'job', status: 'processing' }), { times: 1 });
+    };
+
+    it('rejects with the status of a 5xx, and polls no more', async () => {
+      failSecondPoll(() => new Response('upstream down', { status: 503, statusText: 'Service Unavailable' }));
+      const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, ...NO_DELAY });
+
+      await expect(provider.generate({ prompt: 'x', mode: 'generate' })).rejects.toThrow(/503 Service Unavailable/);
+      expect(statusPolls()).toHaveLength(2);
+    });
+
+    it('rejects with the network error of a dropped connection, and polls no more', async () => {
+      failSecondPoll(() => Response.error());
+      const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, ...NO_DELAY });
+
+      // fetch's own error, untouched: not a provider error and not a timeout.
+      await expect(provider.generate({ prompt: 'x', mode: 'generate' })).rejects.toThrow(/fetch/i);
+      expect(statusPolls()).toHaveLength(2);
+    });
+
+    it('rejects a status frame that is not a JSON object, and polls no more', async () => {
+      failSecondPoll(() => new Response('<html>Bad gateway</html>', { headers: { 'Content-Type': 'text/html' } }));
+      const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, ...NO_DELAY });
+
+      await expect(provider.generate({ prompt: 'x', mode: 'generate' })).rejects.toThrow(
+        'Uploadcare generate status failed (200): the response is not a JSON object: <html>Bad gateway</html>',
+      );
+      expect(statusPolls()).toHaveLength(2);
+    });
+  });
+
+  describe('with the default poll options', () => {
+    // The documented defaults: a poll every 1.5s, giving up after 1,000,000ms.
+    const INTERVAL = 1500;
+    const TIMEOUT = 1_000_000;
+
+    // Only the clock is fake: the emulator's requests still need real I/O turns to complete.
+    beforeEach(() => {
+      vi.useFakeTimers({ toFake: ['setTimeout', 'clearTimeout', 'Date'] });
+      return () => vi.useRealTimers();
+    });
+
+    /** Starts a generation and tracks whether it has settled. */
+    const start = () => {
+      const run = { settled: false, pending: Promise.resolve() as Promise<unknown> };
+      run.pending = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY })
+        .generate({ prompt: 'x', mode: 'generate' })
+        .finally(() => {
+          run.settled = true;
+        });
+      run.pending.catch(() => {});
+      return run;
+    };
+
+    /** Lets the in-flight request finish, without moving the clock, until the poll sleeps or `run` settles. */
+    const untilIdle = async (run: { settled: boolean }) => {
+      while (vi.getTimerCount() === 0 && !run.settled) {
+        await new Promise((resolve) => setImmediate(resolve));
+      }
+    };
+
+    it('waits the default interval between status polls', async () => {
+      const polledAt: number[] = [];
+      session.on(STATUS, () => {
+        polledAt.push(Date.now());
+        return Response.json({ type: 'job', status: 'processing' });
+      });
+      const run = start();
+
+      for (let sleeps = 0; sleeps < 3; sleeps++) {
+        await untilIdle(run);
+        await vi.advanceTimersToNextTimerAsync();
+      }
+      await untilIdle(run);
+
+      expect(polledAt.slice(1).map((at, i) => at - polledAt[i])).toEqual([INTERVAL, INTERVAL, INTERVAL]);
+    });
+
+    it('gives up at the default timeout', async () => {
+      neverFinish();
+      const startedAt = Date.now();
+      const run = start();
+
+      for (;;) {
+        await untilIdle(run);
+        if (run.settled) break;
+        await vi.advanceTimersToNextTimerAsync();
+      }
+
+      expect(Date.now() - startedAt).toBe(TIMEOUT);
+      await expect(run.pending).rejects.toMatchObject({ name: 'AiProviderError', errorCode: 'generation_timeout' });
+    });
   });
 
   it('honours baseUrl + cdnBaseUrl overrides for both generate and status', async () => {
-    const fetchImpl = routedFetch({ type: 'job', job_id: 'job-1' }, [{ status: 'success', uuid: 'xyz' }]);
     const provider = new UploadcareDerivativeApi({
-      publicKey: 'pk',
+      publicKey: PUBLIC_KEY,
       baseUrl: 'https://upload.example.com',
-      cdnBaseUrl: 'https://cdn.example.com',
-      fetch: fetchImpl,
+      cdnBaseUrl: CDN,
       ...NO_DELAY,
     });
     const result = await provider.generate({ prompt: 'x', mode: 'generate' });
-    const [genUrl] = fetchImpl.mock.calls[0]! as [string, RequestInit];
-    const [statusUrl] = fetchImpl.mock.calls[1]! as [string, RequestInit];
-    expect(genUrl).toBe('https://upload.example.com/derivative/image/generate/');
-    expect(statusUrl).toBe('https://upload.example.com/derivative/status/?pub_key=pk&job_id=job-1');
-    expect(result.url).toBe('https://cdn.example.com/xyz/');
+    expect(requestsTo(GENERATE)[0].url).toBe('https://upload.example.com/derivative/image/generate/');
+    expect(requestsTo(STATUS)[0].url).toMatch(
+      new RegExp(`^https://upload\\.example\\.com/derivative/status/\\?pub_key=${PUBLIC_KEY}&job_id=`),
+    );
+    expect(result.url).toBe(`${CDN}/${result.uuid}/`);
   });
 
   it('returns an UploadcareFile on the result (with camelized fields)', async () => {
-    const fetchImpl = routedFetch({ type: 'job', job_id: 'job-1' }, [
-      { status: 'success', uuid: 'final-uuid', original_filename: 'f.png', is_image: true },
-    ]);
     const provider = new UploadcareDerivativeApi({
-      publicKey: 'pk',
-      cdnBaseUrl: 'https://cdn.example.com',
-      fetch: fetchImpl,
+      publicKey: PUBLIC_KEY,
+      cdnBaseUrl: CDN,
       ...NO_DELAY,
     });
-    const result = await provider.generate({ prompt: 'x', mode: 'generate' });
-    expect(result.file.uuid).toBe('final-uuid');
-    expect(result.file.cdnUrl).toBe('https://cdn.example.com/final-uuid/');
+    const result = await provider.generate({ prompt: 'x', mode: 'generate', filename: 'f.png' });
+    expect(result.file.uuid).toBe(result.uuid);
+    expect(result.file.cdnUrl).toBe(`${CDN}/${result.uuid}/`);
     expect(result.file.originalFilename).toBe('f.png');
     expect(result.file.isImage).toBe(true);
-    expect(result.url).toBe('https://cdn.example.com/final-uuid/');
-  });
-
-  it('keeps polling the status until the success frame reports is_ready: true', async () => {
-    const fetchImpl = routedFetch({ type: 'job', job_id: 'job-1' }, [
-      { status: 'success', uuid: 'final-uuid', is_ready: false },
-      { status: 'success', uuid: 'final-uuid', is_ready: true, original_filename: 'ready.png' },
-    ]);
-    const provider = new UploadcareDerivativeApi({
-      publicKey: 'pk',
-      cdnBaseUrl: 'https://cdn.example.com',
-      fetch: fetchImpl,
-      ...NO_DELAY,
-    });
-
-    const result = await provider.generate({ prompt: 'x', mode: 'generate' });
-
-    // 1 POST + 2 status polls: the first `success` frame isn't CDN-ready yet.
-    expect(fetchImpl).toHaveBeenCalledTimes(3);
-    expect(result.file.originalFilename).toBe('ready.png');
-    expect(result.url).toBe('https://cdn.example.com/final-uuid/');
+    expect(result.file.imageInfo).toMatchObject({ width: expect.any(Number), height: expect.any(Number) });
+    expect(result.url).toBe(`${CDN}/${result.uuid}/`);
   });
 
   it('derives the CDN base from the public key when cdnBaseUrl is left at the default', async () => {
-    const fetchImpl = routedFetch({ type: 'job', job_id: 'job-1' }, [{ status: 'success', uuid: 'final-uuid' }]);
-    const provider = new UploadcareDerivativeApi({ publicKey: 'pk', fetch: fetchImpl, ...NO_DELAY });
+    const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, ...NO_DELAY });
     const result = await provider.generate({ prompt: 'x', mode: 'generate' });
-    const base = await getPrefixedCdnBaseAsync('pk', 'https://ucarecd.net');
-    expect(result.url).toBe(`${base}/final-uuid/`);
+    const base = await getPrefixedCdnBaseAsync(PUBLIC_KEY, 'https://ucarecd.net');
+    expect(result.url).toBe(`${base}/${result.uuid}/`);
   });
 
   it('surfaces non-2xx generate responses with status text', async () => {
-    const fetchImpl = vi.fn<typeof fetch>().mockResolvedValue(
-      new Response('bad ratio', {
-        status: 400,
-        statusText: 'Bad Request',
-        headers: { 'Content-Type': 'text/plain' },
-      }),
+    session.on(
+      'POST /derivative/image/generate/',
+      () => new Response('upstream failure', { status: 400, statusText: 'Bad Request' }),
     );
-    const provider = new UploadcareDerivativeApi({ publicKey: 'pk', fetch: fetchImpl, ...NO_DELAY });
-    await expect(provider.generate({ prompt: 'x', mode: 'generate' })).rejects.toThrow(/400/);
-  });
-
-  it('times out when the job never reaches a terminal state', async () => {
-    const fetchImpl = routedFetch({ type: 'job', job_id: 'job-1' }, [{ type: 'job', status: 'processing' }]);
     const provider = new UploadcareDerivativeApi({
-      publicKey: 'pk',
-      fetch: fetchImpl,
-      pollIntervalMs: 0,
-      pollTimeoutMs: 5,
+      publicKey: PUBLIC_KEY,
+      ...NO_DELAY,
     });
-    await expect(provider.generate({ prompt: 'x', mode: 'generate' })).rejects.toThrow(/time/i);
+    await expect(provider.generate({ prompt: 'x', mode: 'generate' })).rejects.toThrow(/400/);
   });
 
-  it('passes the abort signal to generate and status fetches', async () => {
-    const seen: (AbortSignal | undefined)[] = [];
-    const base = routedFetch({ type: 'job', job_id: 'job-1' }, [{ status: 'success', uuid: 'a' }]);
-    const fetchImpl = vi.fn<typeof fetch>().mockImplementation((url, init) => {
-      seen.push(init?.signal ?? undefined);
-      return base(url, init);
-    });
-    const provider = new UploadcareDerivativeApi({ publicKey: 'pk', fetch: fetchImpl, ...NO_DELAY });
+  it('cancels a job that is still starting when the caller aborts', async () => {
+    hang('POST /derivative/image/generate/');
+    const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, ...NO_DELAY });
     const controller = new AbortController();
-    await provider.generate({ prompt: 'x', mode: 'generate', signal: controller.signal });
-    expect(seen.length).toBeGreaterThanOrEqual(2);
-    expect(seen.every((s) => s === controller.signal)).toBe(true);
+
+    const pending = provider.generate({ prompt: 'x', mode: 'generate', signal: controller.signal });
+    await vi.waitFor(() => expect(requestsTo(GENERATE)).toHaveLength(1));
+    controller.abort();
+
+    await expect(pending).rejects.toMatchObject({ name: 'AbortError' });
   });
 
-  it('stops polling when the signal is aborted mid-flight', async () => {
+  it('cancels a status poll in flight when the caller aborts', async () => {
+    hang(STATUS);
+    const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, ...NO_DELAY });
     const controller = new AbortController();
-    const fetchImpl = vi.fn<typeof fetch>().mockImplementation(async (_url, init) => {
-      const method = (init?.method ?? 'GET').toUpperCase();
-      if (method === 'POST') return jsonResponse({ type: 'job', job_id: 'job-1' });
-      // Abort while "processing": the next poll must never happen.
-      controller.abort();
-      return jsonResponse({ type: 'job', status: 'processing' });
-    });
-    const provider = new UploadcareDerivativeApi({ publicKey: 'pk', fetch: fetchImpl, ...NO_DELAY });
 
-    await expect(provider.generate({ prompt: 'x', mode: 'generate', signal: controller.signal })).rejects.toThrow(
-      /cancel/i,
-    );
-    // 1 POST + exactly 1 status poll, then it bails — no further polling.
-    expect(fetchImpl).toHaveBeenCalledTimes(2);
+    const pending = provider.generate({ prompt: 'x', mode: 'generate', signal: controller.signal });
+    await vi.waitFor(() => expect(requestsTo(STATUS)).toHaveLength(1));
+    controller.abort();
+
+    await expect(pending).rejects.toThrow(/cancel/i);
   });
 
-  it('does not start polling when the signal is already aborted', async () => {
+  it('sends nothing when the signal is already aborted', async () => {
     const controller = new AbortController();
     controller.abort();
-    const fetchImpl = vi.fn<typeof fetch>().mockRejectedValue(new DOMException('Aborted', 'AbortError'));
-    const provider = new UploadcareDerivativeApi({ publicKey: 'pk', fetch: fetchImpl, ...NO_DELAY });
-    await expect(provider.generate({ prompt: 'x', mode: 'generate', signal: controller.signal })).rejects.toThrow();
+    const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, ...NO_DELAY });
+    await expect(provider.generate({ prompt: 'x', mode: 'generate', signal: controller.signal })).rejects.toMatchObject(
+      { name: 'AbortError' },
+    );
+    expect(session.requests).toHaveLength(0);
   });
 
   describe('edit mode', () => {
-    it('POSTs prompt + source uuid to the edit endpoint and resolves the result', async () => {
-      const fetchImpl = routedFetch({ type: 'job', job_id: 'job-e' }, [{ status: 'success', uuid: 'edited-uuid' }]);
+    it('edits the source into a new file at the requested aspect ratio', async () => {
       const provider = new UploadcareDerivativeApi({
-        publicKey: 'pk',
-        cdnBaseUrl: 'https://cdn.example.com',
-        fetch: fetchImpl,
+        publicKey: PUBLIC_KEY,
+        cdnBaseUrl: CDN,
         ...NO_DELAY,
       });
 
       const result = await provider.generate({
         prompt: 'remove the cat',
         mode: 'edit',
-        source: 'src-uuid',
+        source: DEMO_IMAGE_UUID,
         aspectRatio: [16, 9],
       });
 
-      const [url, init] = fetchImpl.mock.calls[0]! as [string, RequestInit];
-      expect(url).toBe('https://upload.uploadcare.com/derivative/image/edit/');
-      expect(readSentBody(init)).toMatchObject({
-        pub_key: 'pk',
-        prompt: 'remove the cat',
-        source: 'src-uuid',
-        aspect_ratio: [16, 9],
-      });
-      expect(result.url).toBe('https://cdn.example.com/edited-uuid/');
+      expect(requestsTo(EDIT)).toHaveLength(1);
+      expect(result.uuid).not.toBe(DEMO_IMAGE_UUID);
+      expect(ratioOf(result.file)).toBe(16 / 9);
+      expect(result.url).toBe(`${CDN}/${result.uuid}/`);
       expect(result.mode).toBe('edit');
     });
 
-    it('omits aspect_ratio when none is provided', async () => {
-      const fetchImpl = routedFetch({ type: 'job', job_id: 'job-e' }, [{ status: 'success', uuid: 'u' }]);
-      const provider = new UploadcareDerivativeApi({ publicKey: 'pk', fetch: fetchImpl, ...NO_DELAY });
-      await provider.generate({ prompt: 'x', mode: 'edit', source: 'src-uuid' });
-      expect(readSentBody(fetchImpl.mock.calls[0]![1] as RequestInit).aspect_ratio).toBeUndefined();
+    it("keeps the source's dimensions when no aspectRatio is given", async () => {
+      const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, ...NO_DELAY });
+      const source = await provider.getFileInfo(DEMO_IMAGE_UUID);
+      const { file } = await provider.generate({ prompt: 'x', mode: 'edit', source: DEMO_IMAGE_UUID });
+      expect(file.imageInfo).toMatchObject({ width: source.imageInfo?.width, height: source.imageInfo?.height });
+      // The seeded demo image is not square, so a 1:1 default would show here.
+      expect(ratioOf(file)).not.toBe(1);
     });
 
     it('throws (without any request) when an edit has no source uuid', async () => {
-      const fetchImpl = routedFetch({ type: 'job', job_id: 'j' }, [{ status: 'success', uuid: 'x' }]);
-      const provider = new UploadcareDerivativeApi({ publicKey: 'pk', fetch: fetchImpl, ...NO_DELAY });
+      const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, ...NO_DELAY });
       await expect(provider.generate({ prompt: 'x', mode: 'edit' })).rejects.toThrow(/source/i);
-      expect(fetchImpl).not.toHaveBeenCalled();
+      expect(session.requests).toHaveLength(0);
     });
 
     it('resolveCdnUrl maps a uuid to its CDN URL', async () => {
-      const provider = new UploadcareDerivativeApi({
-        publicKey: 'pk',
-        cdnBaseUrl: 'https://cdn.example.com',
-        fetch: vi.fn<typeof fetch>(),
-        ...NO_DELAY,
-      });
-      expect(await provider.resolveCdnUrl('some-uuid')).toBe('https://cdn.example.com/some-uuid/');
+      const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, cdnBaseUrl: CDN });
+      expect(await provider.resolveCdnUrl('some-uuid')).toBe(`${CDN}/some-uuid/`);
     });
   });
 
   describe('getFileInfo', () => {
-    afterEach(() => mockIsReadyPoll.mockReset());
-
-    const fileInfoFixture = {
-      uuid: 'file-uuid',
-      originalFilename: 'portrait.png',
-      isImage: true,
-      mimeType: 'image/png',
-      imageInfo: { width: 800, height: 1200, format: 'PNG' },
-    } as unknown as Awaited<ReturnType<typeof isReadyPoll>>;
-
-    it('polls isReadyPoll() and wraps the ready file as an UploadcareFile on the CDN base', async () => {
-      mockIsReadyPoll.mockResolvedValue(fileInfoFixture);
-      const provider = new UploadcareDerivativeApi({
-        publicKey: 'pk',
-        cdnBaseUrl: 'https://cdn.example.com',
-        fetch: vi.fn<typeof fetch>(),
-        ...NO_DELAY,
-      });
+    it('waits for the file to be ready and wraps it as an UploadcareFile on the CDN base', async () => {
+      const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, cdnBaseUrl: CDN });
 
-      const file = await provider.getFileInfo('file-uuid');
+      const file = await provider.getFileInfo(DEMO_IMAGE_UUID);
 
-      expect(mockIsReadyPoll).toHaveBeenCalledWith('file-uuid', expect.objectContaining({ publicKey: 'pk' }));
-      expect(file.uuid).toBe('file-uuid');
-      expect(file.originalFilename).toBe('portrait.png');
-      expect(file.cdnUrl).toBe('https://cdn.example.com/file-uuid/');
-      expect(file.imageInfo).toMatchObject({ width: 800, height: 1200 });
+      expect(file.uuid).toBe(DEMO_IMAGE_UUID);
+      expect(file.cdnUrl).toBe(`${CDN}/${DEMO_IMAGE_UUID}/`);
+      expect(file.imageInfo).toMatchObject({ width: expect.any(Number), height: expect.any(Number) });
     });
 
-    it('forwards baseUrl + abort signal to isReadyPoll()', async () => {
-      mockIsReadyPoll.mockResolvedValue(fileInfoFixture);
-      const provider = new UploadcareDerivativeApi({
-        publicKey: 'pk',
-        baseUrl: 'https://upload.example.com',
-        fetch: vi.fn<typeof fetch>(),
-        ...NO_DELAY,
-      });
+    it('honours the abort signal', async () => {
+      const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY });
       const controller = new AbortController();
-      await provider.getFileInfo('file-uuid', controller.signal);
-      expect(mockIsReadyPoll).toHaveBeenCalledWith(
-        'file-uuid',
-        expect.objectContaining({ baseURL: 'https://upload.example.com', signal: controller.signal }),
-      );
+      controller.abort();
+      await expect(provider.getFileInfo(DEMO_IMAGE_UUID, controller.signal)).rejects.toThrow(/cancel/i);
     });
 
-    it('propagates isReadyPoll() failures', async () => {
-      mockIsReadyPoll.mockRejectedValue(new Error('FileNotFound'));
-      const provider = new UploadcareDerivativeApi({ publicKey: 'pk', fetch: vi.fn<typeof fetch>(), ...NO_DELAY });
-      await expect(provider.getFileInfo('missing')).rejects.toThrow(/FileNotFound/);
+    it('propagates a lookup failure', async () => {
+      const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY });
+      // A well-formed uuid the session does not hold: a malformed id would be
+      // refused earlier, as invalid, and never reach the not-found lookup.
+      await expect(provider.getFileInfo('00000000-0000-4000-8000-000000000000')).rejects.toThrow(/not found/i);
     });
   });
 
   describe('authToken', () => {
-    afterEach(() => mockIsReadyPoll.mockReset());
+    // A signed-uploads project refuses every request without a valid Bearer
+    // token, so each call below succeeding is the proof the token got there.
+    beforeEach(() => {
+      session.use('signedUploads');
+    });
 
     it('carries the token on both network paths', async () => {
       // The two paths are independent: `generate`/`edit`/`status` go through
       // the client's own fetch, while `getFileInfo` hands options to
       // upload-client's isReadyPoll. Dropping either assignment would leave
       // half the provider unauthenticated.
-      mockIsReadyPoll.mockResolvedValue({ uuid: 'file-uuid' } as unknown as Awaited<ReturnType<typeof isReadyPoll>>);
-      const fetchImpl = routedFetch({ type: 'job', job_id: 'job-1' }, [{ status: 'success', uuid: 'abc-123' }]);
+      const token = await mintAuthToken();
       const provider = new UploadcareDerivativeApi({
-        publicKey: 'pk',
-        authToken: 'eyJ.first.sig',
-        fetch: fetchImpl,
+        publicKey: PUBLIC_KEY,
+        authToken: token,
         ...NO_DELAY,
       });
 
       await provider.generate({ prompt: 'x', mode: 'generate' });
-      const [, init] = fetchImpl.mock.calls[0]! as [string, RequestInit];
-      expect(new Headers(init.headers).get('Authorization')).toBe('Bearer eyJ.first.sig');
+      expect(requestsTo(GENERATE)[0].headers.get('Authorization')).toBe(`Bearer ${token}`);
 
-      await provider.getFileInfo('file-uuid');
-      expect(mockIsReadyPoll).toHaveBeenCalledWith(
-        'file-uuid',
-        expect.objectContaining({ authToken: 'eyJ.first.sig' }),
-      );
+      await expect(provider.getFileInfo(DEMO_IMAGE_UUID)).resolves.toMatchObject({ uuid: DEMO_IMAGE_UUID });
+    });
+
+    it('is refused on both network paths without one', async () => {
+      const provider = new UploadcareDerivativeApi({
+        publicKey: PUBLIC_KEY,
+        ...NO_DELAY,
+      });
+      await expect(provider.generate({ prompt: 'x', mode: 'generate' })).rejects.toThrow(/signature/i);
+      await expect(provider.getFileInfo(DEMO_IMAGE_UUID)).rejects.toThrow(/signature/i);
+    });
+
+    it('surfaces a token the API cannot read as AccessTokenInvalidError, without polling', async () => {
+      const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, authToken: 'not-a-jwt', ...NO_DELAY });
+
+      await expect(provider.generate({ prompt: 'x', mode: 'generate' })).rejects.toMatchObject({
+        name: 'AiProviderError',
+        errorCode: 'AccessTokenInvalidError',
+      });
+      expect(requestsTo(STATUS)).toHaveLength(0);
+    });
+
+    it('surfaces a token that expires mid-job as AccessTokenExpiredError on the next poll', async () => {
+      // Two minutes past `exp`, beyond the API's 30s clock leeway.
+      const [fresh, expired] = [await mintAuthToken(), await mintAuthToken({ lifetime: -120_000 })];
+      const authToken = vi.fn().mockResolvedValueOnce(fresh).mockResolvedValue(expired);
+      const provider = new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY, authToken, ...NO_DELAY });
+
+      await expect(provider.generate({ prompt: 'x', mode: 'generate' })).rejects.toMatchObject({
+        name: 'AiProviderError',
+        errorCode: 'AccessTokenExpiredError',
+      });
+      // The start went through on the fresh token; the first poll, on the expired one, ended the job.
+      expect(requestsTo(STATUS)).toHaveLength(1);
+    });
+
+    it("rejects with the token function's own error and sends nothing when it throws", async () => {
+      const provider = new UploadcareDerivativeApi({
+        publicKey: PUBLIC_KEY,
+        authToken: async () => {
+          throw new Error('token service down');
+        },
+        ...NO_DELAY,
+      });
+
+      await expect(provider.generate({ prompt: 'x', mode: 'generate' })).rejects.toThrow('token service down');
+      expect(session.requests).toHaveLength(0);
     });
 
     it('follows a token that changes, on both network paths', async () => {
       // The provider holds one resolver for its lifetime; whoever owns the
       // token changes what that resolver returns, and nothing is pushed in.
-      mockIsReadyPoll.mockResolvedValue({ uuid: 'file-uuid' } as unknown as Awaited<ReturnType<typeof isReadyPoll>>);
-      const fetchImpl = routedFetch({ type: 'job', job_id: 'job-1' }, [{ status: 'success', uuid: 'abc-123' }]);
-      let token = 'eyJ.first.sig';
+      const [first, second] = [await mintAuthToken({ tokenId: 'first' }), await mintAuthToken({ tokenId: 'second' })];
+      let token = first;
       const provider = new UploadcareDerivativeApi({
-        publicKey: 'pk',
+        publicKey: PUBLIC_KEY,
         authToken: () => token,
-        fetch: fetchImpl,
         ...NO_DELAY,
       });
+      const tokensSent = (requests: Request[]) =>
+        new Set(requests.map((request) => request.headers.get('Authorization')));
 
-      token = 'eyJ.second.sig';
+      await provider.generate({ prompt: 'x', mode: 'generate' });
+      await expect(provider.getFileInfo(DEMO_IMAGE_UUID)).resolves.toMatchObject({ uuid: DEMO_IMAGE_UUID });
+      const beforeRotation = session.requests.length;
 
+      token = second;
       await provider.generate({ prompt: 'x', mode: 'generate' });
-      const [, init] = fetchImpl.mock.calls[0]! as [string, RequestInit];
-      expect(new Headers(init.headers).get('Authorization')).toBe('Bearer eyJ.second.sig');
-
-      // upload-client is handed the resolver itself and calls it per request,
-      // so what matters is what it resolves to now.
-      await provider.getFileInfo('file-uuid');
-      const [, pollOptions] = mockIsReadyPoll.mock.calls[0]! as [string, { authToken: () => string }];
-      expect(pollOptions.authToken()).toBe('eyJ.second.sig');
+      await expect(provider.getFileInfo(DEMO_IMAGE_UUID)).resolves.toMatchObject({ uuid: DEMO_IMAGE_UUID });
+
+      expect(tokensSent(session.requests.slice(0, beforeRotation))).toEqual(new Set([`Bearer ${first}`]));
+      expect(tokensSent(session.requests.slice(beforeRotation))).toEqual(new Set([`Bearer ${second}`]));
     });
   });
 });
diff --git a/packages/ai-image-editor/src/entities/provider/api/uploadcareDerivativeApi.ts b/packages/ai-image-editor/src/entities/provider/api/uploadcareDerivativeApi.ts
index 16f6e57..0823792 100644
--- a/packages/ai-image-editor/src/entities/provider/api/uploadcareDerivativeApi.ts
+++ b/packages/ai-image-editor/src/entities/provider/api/uploadcareDerivativeApi.ts
@@ -33,8 +33,6 @@ export type UploadcareDerivativeApiOptions = {
   filename?: string;
   /** Whether to store the generated image. Defaults to "auto" (per server default). */
   store?: 'auto' | boolean;
-  /** Override the global fetch — useful for tests. */
-  fetch?: typeof fetch;
   /**
    * CDN cname for resolving `{uuid}` responses. When left at the default
    * `https://ucarecdn.com` (or already a prefixed base), the actual base is
@@ -91,7 +89,6 @@ export class UploadcareDerivativeApi implements AiProvider {
     this.api = new UploadcareApiClient({
       publicKey: options.publicKey,
       baseUrl: options.baseUrl,
-      fetch: options.fetch,
       authToken: options.authToken,
     });
     this.publicKey = options.publicKey;
diff --git a/packages/ai-image-editor/src/features/aspect-ratio-select/ui/UcAiAspectRatio.test.ts b/packages/ai-image-editor/src/features/aspect-ratio-select/ui/UcAiAspectRatio.test.ts
index 75cbf8f..ae5860c 100644
--- a/packages/ai-image-editor/src/features/aspect-ratio-select/ui/UcAiAspectRatio.test.ts
+++ b/packages/ai-image-editor/src/features/aspect-ratio-select/ui/UcAiAspectRatio.test.ts
@@ -34,9 +34,19 @@ describe('UcAiAspectRatio', () => {
     expect(selected[0]!.querySelector('.option-ratio')?.textContent).toBe('3:2');
   });
 
+  it('names the listbox after the picker', async () => {
+    const el = await mount({ labelText: 'Pick aspect ratio' });
+    expect(el.shadowRoot!.querySelector('[role="listbox"]')?.getAttribute('aria-label')).toBe('Pick aspect ratio');
+  });
+
+  it('announces the selected ratio in the trigger name', async () => {
+    const el = await mount({ labelText: 'Pick aspect ratio' });
+    expect(trigger(el).getAttribute('aria-label')).toBe('Pick aspect ratio: 3:2');
+  });
+
   it('disables the trigger while busy', async () => {
     const el = await mount({ busy: true });
-    expect(trigger(el).disabled).toBe(true);
+    expect(trigger(el)).toHaveProperty('disabled', true);
   });
 
   it('renders an Auto entry when one is provided (edit mode)', async () => {
diff --git a/packages/ai-image-editor/src/features/aspect-ratio-select/ui/UcAiAspectRatio.ts b/packages/ai-image-editor/src/features/aspect-ratio-select/ui/UcAiAspectRatio.ts
index 23521c8..db77719 100644
--- a/packages/ai-image-editor/src/features/aspect-ratio-select/ui/UcAiAspectRatio.ts
+++ b/packages/ai-image-editor/src/features/aspect-ratio-select/ui/UcAiAspectRatio.ts
@@ -31,7 +31,8 @@ export class UcAiAspectRatio extends LitElement {
   public busy = false;
 
   /**
-   * Accessible label for the trigger. A plain property (not the inherited
+   * Accessible label for the trigger (which appends the current selection) and
+   * the listbox. A plain property (not the inherited
    * `ariaLabel`) so it doesn't also stamp `aria-label` on the host element.
    */
   @property({ attribute: 'aria-label-text' })
@@ -93,6 +94,7 @@ export class UcAiAspectRatio extends LitElement {
 
   public override render(): TemplateResult {
     const triggerLabel = this._triggerLabel();
+    const label = this.labelText ?? 'Aspect ratio';
 
     return html`
       <button
@@ -100,14 +102,14 @@ export class UcAiAspectRatio extends LitElement {
         class="trigger"
         aria-haspopup="listbox"
         aria-expanded="${this.open ? 'true' : 'false'}"
-        aria-label="${this.labelText ?? 'Aspect ratio'}"
+        aria-label="${triggerLabel ? `${label}: ${triggerLabel}` : label}"
         ?disabled=${this.busy}
         @click=${this._toggle}
       >
         ${this.selected ? unsafeSVG(this._iconFor(this.selected)) : null}
         ${triggerLabel ? html`<span class="trigger-label">${triggerLabel}</span>` : null}
       </button>
-      <div class="popover" popover="auto" role="listbox" @toggle=${this._onToggle}>
+      <div class="popover" popover="auto" role="listbox" aria-label="${label}" @toggle=${this._onToggle}>
         <div class="popover-inner">
           ${this.options.map((option) => {
             const isSelected = this.selected ? aspectRatioValueEquals(option.value, this.selected) : false;
diff --git a/packages/ai-image-editor/src/features/aspect-ratio-select/ui/aspect-ratio.css b/packages/ai-image-editor/src/features/aspect-ratio-select/ui/aspect-ratio.css
index c8f89eb..3fe7303 100644
--- a/packages/ai-image-editor/src/features/aspect-ratio-select/ui/aspect-ratio.css
+++ b/packages/ai-image-editor/src/features/aspect-ratio-select/ui/aspect-ratio.css
@@ -22,7 +22,7 @@
 }
 
 .trigger:hover,
-.trigger[aria-expanded='true'] {
+.trigger[aria-expanded="true"] {
   background: var(--uc-ai-secondary-hover);
 }
 
@@ -123,7 +123,7 @@
   background: var(--uc-ai-secondary);
 }
 
-.option[aria-selected='true'] {
+.option[aria-selected="true"] {
   background: var(--uc-ai-secondary-hover);
 }
 
diff --git a/packages/ai-image-editor/src/features/generation/model/GenerationController.test.ts b/packages/ai-image-editor/src/features/generation/model/GenerationController.test.ts
index 44a12f6..aaa8af7 100644
--- a/packages/ai-image-editor/src/features/generation/model/GenerationController.test.ts
+++ b/packages/ai-image-editor/src/features/generation/model/GenerationController.test.ts
@@ -16,8 +16,17 @@ const okResult = (url: string, prompt: string, mode: AiEditorMode = 'generate'):
 class FakeHost implements ReactiveControllerHost {
   public requestUpdate = vi.fn();
   public updateComplete = Promise.resolve(true);
-  public addController = vi.fn<(controller: ReactiveController) => void>();
   public removeController = vi.fn();
+  private readonly controllers: ReactiveController[] = [];
+
+  public addController(controller: ReactiveController): void {
+    this.controllers.push(controller);
+  }
+
+  /** What a Lit element does when it leaves the DOM. */
+  public disconnect(): void {
+    for (const controller of this.controllers) controller.hostDisconnected?.();
+  }
 }
 
 /** Provider whose generate() resolves with the next value supplied via setNext(). */
@@ -58,11 +67,6 @@ describe('GenerationController', () => {
     host = new FakeHost();
   });
 
-  it('registers itself with the host on construction', () => {
-    const ctrl = new GenerationController(host);
-    expect(host.addController).toHaveBeenCalledWith(ctrl);
-  });
-
   it('starts with busy=false, no result, no error, empty history', () => {
     const ctrl = new GenerationController(host);
     expect(ctrl.busy).toBe(false);
@@ -176,23 +180,24 @@ describe('GenerationController', () => {
     expect(host.requestUpdate).toHaveBeenCalled();
   });
 
-  it('hostDisconnected aborts the in-flight request', () => {
+  it('aborts the in-flight request when its host disconnects', () => {
     const ctrl = new GenerationController(host);
     const { provider, observeSignal } = createDeferredProvider();
     void ctrl.run({ provider, prompt: 'x', mode: 'generate' });
-    ctrl.hostDisconnected();
+    host.disconnect();
     expect(observeSignal()?.aborted).toBe(true);
   });
 
-  it('requests an update on each significant transition', async () => {
+  it('asks the host to re-render when a run starts and again when it settles', async () => {
     const ctrl = new GenerationController(host);
-    const provider: AiProvider = {
-      id: 'fake',
-      generate: async ({ prompt, mode }) => okResult('https://example.com/x.jpg', prompt, mode),
-    };
+    const { provider, setNext } = createDeferredProvider();
+
+    const run = ctrl.run({ provider, prompt: 'x', mode: 'generate' });
+    expect(host.requestUpdate).toHaveBeenCalled();
+
     host.requestUpdate.mockClear();
-    await ctrl.run({ provider, prompt: 'x', mode: 'generate' });
-    // One on enter-busy + one on finally.
-    expect(host.requestUpdate).toHaveBeenCalledTimes(2);
+    setNext(okResult('https://example.com/x.jpg', 'x'));
+    await run;
+    expect(host.requestUpdate).toHaveBeenCalled();
   });
 });
diff --git a/packages/ai-image-editor/src/features/preset-chips/ui/UcAiChips.test.ts b/packages/ai-image-editor/src/features/preset-chips/ui/UcAiChips.test.ts
index 10cf5c3..1244a57 100644
--- a/packages/ai-image-editor/src/features/preset-chips/ui/UcAiChips.test.ts
+++ b/packages/ai-image-editor/src/features/preset-chips/ui/UcAiChips.test.ts
@@ -28,7 +28,8 @@ describe('UcAiChips', () => {
 
   it('renders chips as plain buttons (no sticky pressed state)', async () => {
     const el = await mount({ mode: 'generate' });
-    expect(chips(el).some((c) => c.hasAttribute('aria-pressed'))).toBe(false);
+    expect(chips(el)).not.toHaveLength(0);
+    expect(chips(el).filter((c) => c.hasAttribute('aria-pressed'))).toEqual([]);
   });
 
   it('emits uc:select with the preset when a chip is clicked', async () => {
@@ -44,6 +45,6 @@ describe('UcAiChips', () => {
 
   it('disables the chips while busy', async () => {
     const el = await mount({ mode: 'generate', busy: true });
-    expect(chips(el).every((c) => c.disabled)).toBe(true);
+    expect(chips(el).map((c) => c.disabled)).toEqual(MODES.generate.presets.map(() => true));
   });
 });
diff --git a/packages/ai-image-editor/src/features/prompt-history/ui/UcAiHistory.test.ts b/packages/ai-image-editor/src/features/prompt-history/ui/UcAiHistory.test.ts
index 5fd091c..bc3c14b 100644
--- a/packages/ai-image-editor/src/features/prompt-history/ui/UcAiHistory.test.ts
+++ b/packages/ai-image-editor/src/features/prompt-history/ui/UcAiHistory.test.ts
@@ -37,7 +37,6 @@ async function mount(overrides: Partial<UcAiHistory> = {}): Promise<UcAiHistory>
 }
 
 const chips = (el: UcAiHistory) => [...el.shadowRoot!.querySelectorAll<HTMLButtonElement>('.chip')];
-const startOver = (el: UcAiHistory) => el.shadowRoot!.querySelector<HTMLButtonElement>('.startover__btn');
 const prev = (el: UcAiHistory) => el.shadowRoot!.querySelector<HTMLButtonElement>('.nav--prev');
 const next = (el: UcAiHistory) => el.shadowRoot!.querySelector<HTMLButtonElement>('.nav--next');
 
@@ -53,7 +52,6 @@ describe('UcAiHistory', () => {
   it('renders nothing in generate mode with no results', async () => {
     const el = await mount({ entries: [], showStartOver: false });
     expect(chips(el)).toHaveLength(0);
-    expect(startOver(el)).toBeNull();
     expect(el.shadowRoot!.querySelector('.strip')).toBeNull();
   });
 
@@ -104,8 +102,8 @@ describe('UcAiHistory', () => {
     const el = await mount({ entries: series(7), selectedUuid: 'e6' });
     // ordered oldest→newest is e0…e6; the newest window is e2…e6.
     expect(labelsOf(el)).toEqual(['e2', 'e3', 'e4', 'e5', 'e6']);
-    expect(prev(el)!.disabled).toBe(false); // an older result exists
-    expect(next(el)!.disabled).toBe(true); // already at the newest
+    expect(prev(el)).toHaveProperty('disabled', false); // an older result exists
+    expect(next(el)).toHaveProperty('disabled', true); // already at the newest
   });
 
   it('prev/next step the active result and emit uc:select', async () => {
@@ -114,6 +112,7 @@ describe('UcAiHistory', () => {
     el.addEventListener('uc:select', onSelect);
 
     prev(el)!.click(); // one older than e6
+    expect(onSelect).toHaveBeenCalledOnce();
     expect((onSelect.mock.calls[0]![0] as CustomEvent).detail.entry.id).toBe('e5');
 
     // The parent restores that result, handing the selection back down.
@@ -155,12 +154,12 @@ describe('UcAiHistory', () => {
 
   it('disables prev at the oldest result and next at the newest', async () => {
     const oldest = await mount({ entries: series(7), selectedUuid: 'e0' });
-    expect(prev(oldest)!.disabled).toBe(true);
-    expect(next(oldest)!.disabled).toBe(false);
+    expect(prev(oldest)).toHaveProperty('disabled', true);
+    expect(next(oldest)).toHaveProperty('disabled', false);
 
     const newest = await mount({ entries: series(7), selectedUuid: 'e6' });
-    expect(prev(newest)!.disabled).toBe(false);
-    expect(next(newest)!.disabled).toBe(true);
+    expect(prev(newest)).toHaveProperty('disabled', false);
+    expect(next(newest)).toHaveProperty('disabled', true);
   });
 
   it('keeps the window steady across unrelated re-renders (fresh array, same selection)', async () => {
@@ -226,7 +225,7 @@ describe('UcAiHistory', () => {
       expect(chips(el)).toHaveLength(9);
       expect(prev(el)).toBeNull();
       expect(next(el)).toBeNull();
-      expect(el.shadowRoot!.querySelector('.chips--carousel')).toBeTruthy();
+      expect(el.shadowRoot!.querySelector('.chips--carousel')).not.toBeNull();
     });
 
     it('selects the chip whose uuid is tapped and emits uc:select', async () => {
@@ -236,6 +235,7 @@ describe('UcAiHistory', () => {
       el.addEventListener('uc:select', onSelect);
 
       chips(el)[0]!.click(); // oldest (e0)
+      expect(onSelect).toHaveBeenCalledOnce();
       expect((onSelect.mock.calls[0]![0] as CustomEvent).detail.entry.id).toBe('e0');
     });
 
@@ -243,19 +243,8 @@ describe('UcAiHistory', () => {
       mockCoarse(false);
       const el = await mount({ entries: series(9), selectedUuid: 'e8' });
       expect(chips(el)).toHaveLength(5);
-      expect(next(el)).toBeTruthy();
+      expect(next(el)).not.toBeNull();
       expect(el.shadowRoot!.querySelector('.chips--carousel')).toBeNull();
     });
   });
-
-  it.skip('shows a Start over control in edit mode and emits uc:start-over', async () => {
-    const el = await mount({ entries: [], showStartOver: true, startOverLabel: 'Start over' });
-    expect(el.shadowRoot!.querySelector('.strip')).toBeTruthy();
-    expect(startOver(el)?.textContent).toContain('Start over');
-
-    const onStartOver = vi.fn();
-    el.addEventListener('uc:start-over', onStartOver);
-    startOver(el)!.click();
-    expect(onStartOver).toHaveBeenCalledOnce();
-  });
 });
diff --git a/packages/ai-image-editor/src/features/prompt-input/ui/UcAiPromptRow.test.ts b/packages/ai-image-editor/src/features/prompt-input/ui/UcAiPromptRow.test.ts
index b14d1cb..53aba22 100644
--- a/packages/ai-image-editor/src/features/prompt-input/ui/UcAiPromptRow.test.ts
+++ b/packages/ai-image-editor/src/features/prompt-input/ui/UcAiPromptRow.test.ts
@@ -19,16 +19,17 @@ const keydown = (el: UcAiPromptRow, init: KeyboardEventInit) =>
 describe('UcAiPromptRow', () => {
   it('renders a multiline textarea inside the composer card', async () => {
     const el = await mount({ placeholder: 'Describe your image' });
-    expect(textarea(el)).toBeTruthy();
+    expect(textarea(el)).toBeInstanceOf(HTMLTextAreaElement);
     expect(el.shadowRoot!.querySelector('input')).toBeNull();
-    expect(el.shadowRoot!.querySelector('.card')).toBeTruthy();
+    // The textarea sits inside the composer card.
+    expect(el.shadowRoot!.querySelector('.card')).toContain(textarea(el));
     expect(textarea(el).placeholder).toBe('Describe your image');
   });
 
   it('exposes slots for chips and the aspect-ratio picker', async () => {
     const el = await mount();
-    expect(el.shadowRoot!.querySelector('slot[name="chips"]')).toBeTruthy();
-    expect(el.shadowRoot!.querySelector('slot[name="aspect-ratio"]')).toBeTruthy();
+    expect(el.shadowRoot!.querySelector('slot[name="chips"]')).not.toBeNull();
+    expect(el.shadowRoot!.querySelector('slot[name="aspect-ratio"]')).not.toBeNull();
   });
 
   it('emits uc:send on Enter when the value is non-empty', async () => {
@@ -100,18 +101,18 @@ describe('UcAiPromptRow', () => {
 
   it('disables the textarea and send button while busy', async () => {
     const el = await mount({ value: 'hi', busy: true });
-    expect(textarea(el).disabled).toBe(true);
-    expect(sendBtn(el)!.disabled).toBe(true);
-    expect(sendBtn(el)!.classList.contains('send--busy')).toBe(true);
+    expect(textarea(el)).toHaveProperty('disabled', true);
+    expect(sendBtn(el)).toHaveProperty('disabled', true);
+    expect(sendBtn(el)!.classList).toContain('send--busy');
   });
 
   it('hides (collapses) the send button when empty and reveals it otherwise', async () => {
     const el = await mount();
-    expect(sendBtn(el)!.hidden).toBe(true);
+    expect(sendBtn(el)).toHaveProperty('hidden', true);
 
     el.value = 'hi';
     await el.updateComplete;
-    expect(sendBtn(el)!.hidden).toBe(false);
+    expect(sendBtn(el)).toHaveProperty('hidden', false);
   });
 
   it('emits uc:send when the send button is clicked', async () => {
diff --git a/packages/ai-image-editor/src/shared/lib/cdn.test.ts b/packages/ai-image-editor/src/shared/lib/cdn.test.ts
index 2a3a1b0..4bb9573 100644
--- a/packages/ai-image-editor/src/shared/lib/cdn.test.ts
+++ b/packages/ai-image-editor/src/shared/lib/cdn.test.ts
@@ -1,3 +1,4 @@
+import fc from 'fast-check';
 import { describe, expect, it, vi } from 'vitest';
 
 import { CDN_MAX_OUTPUT_DIMENSION, cdnPreviewUrl, cdnSquareThumbUrl } from './cdn';
@@ -13,31 +14,63 @@ describe('cdn helpers', () => {
 
   it('builds a dpr-scaled preview url capped at the CDN limit (resize directive only)', () => {
     vi.stubGlobal('devicePixelRatio', 2);
-    try {
-      // Only the resize directive — the CDN applies format/auto + quality itself.
-      expect(cdnPreviewUrl(UC_URL, 800)).toBe(`${UC_URL}-/preview/1600x1600/`);
-      expect(cdnPreviewUrl(UC_URL, 2000)).toContain(`preview/${CDN_MAX_OUTPUT_DIMENSION}x${CDN_MAX_OUTPUT_DIMENSION}`);
-    } finally {
-      vi.unstubAllGlobals();
-    }
+    // Only the resize directive — the CDN applies format/auto + quality itself.
+    expect(cdnPreviewUrl(UC_URL, 800)).toBe(`${UC_URL}-/preview/1600x1600/`);
+    expect(cdnPreviewUrl(UC_URL, 2000)).toContain(`preview/${CDN_MAX_OUTPUT_DIMENSION}x${CDN_MAX_OUTPUT_DIMENSION}`);
   });
 
   it('scales the preview by devicePixelRatio', () => {
     vi.stubGlobal('devicePixelRatio', 1);
-    try {
-      expect(cdnPreviewUrl(UC_URL, 800)).toBe(`${UC_URL}-/preview/800x800/`);
-    } finally {
-      vi.unstubAllGlobals();
-    }
+    expect(cdnPreviewUrl(UC_URL, 800)).toBe(`${UC_URL}-/preview/800x800/`);
   });
 
   it('builds a dpr-scaled centered square crop-to-fill thumbnail', () => {
     vi.stubGlobal('devicePixelRatio', 2);
-    try {
-      // scale_crop (not preview) so a non-square source fills the square tile sharply.
-      expect(cdnSquareThumbUrl(UC_URL, 48)).toBe(`${UC_URL}-/scale_crop/96x96/center/`);
-    } finally {
-      vi.unstubAllGlobals();
-    }
+    // scale_crop (not preview) so a non-square source fills the square tile sharply.
+    expect(cdnSquareThumbUrl(UC_URL, 48)).toBe(`${UC_URL}-/scale_crop/96x96/center/`);
+  });
+
+  describe('for any file, box size and devicePixelRatio', () => {
+    const fileUrl = fc
+      .tuple(
+        fc.constantFrom('https://ucarecdn.com', 'https://1a2b3c4d5e.ucarecd.net', 'https://cdn.example.com'),
+        fc.uuid(),
+      )
+      .map(([origin, uuid]) => `${origin}/${uuid}/`);
+    const cssSize = fc.double({ min: 1, max: 5000, noNaN: true });
+    const dpr = fc.double({ min: 0.25, max: 4, noNaN: true });
+
+    /**
+     * Holds `side` (the n of an n×n directive) to the box: never past the CDN limit, never short of the box's device
+     * pixels (counting a dpr below 1 as 1) unless the limit stops it, and never a whole pixel more.
+     */
+    const expectSideToFit = (side: number, css: number, ratio: number) => {
+      const needed = css * Math.max(ratio, 1);
+      expect(side).toBeLessThanOrEqual(CDN_MAX_OUTPUT_DIMENSION);
+      expect(side).toBeGreaterThanOrEqual(Math.min(needed, CDN_MAX_OUTPUT_DIMENSION));
+      expect(side - 1).toBeLessThan(needed);
+    };
+
+    it('appends one square preview sized to the box', () => {
+      fc.assert(
+        fc.property(fileUrl, cssSize, dpr, (url, css, ratio) => {
+          vi.stubGlobal('devicePixelRatio', ratio);
+          const [, w] = cdnPreviewUrl(url, css).match(/\/-\/preview\/(\d+)x/) ?? [];
+          expect(cdnPreviewUrl(url, css)).toBe(`${url}-/preview/${w}x${w}/`);
+          expectSideToFit(Number(w), css, ratio);
+        }),
+      );
+    });
+
+    it('appends one centred square crop sized to the box', () => {
+      fc.assert(
+        fc.property(fileUrl, cssSize, dpr, (url, css, ratio) => {
+          vi.stubGlobal('devicePixelRatio', ratio);
+          const [, w] = cdnSquareThumbUrl(url, css).match(/\/-\/scale_crop\/(\d+)x/) ?? [];
+          expect(cdnSquareThumbUrl(url, css)).toBe(`${url}-/scale_crop/${w}x${w}/center/`);
+          expectSideToFit(Number(w), css, ratio);
+        }),
+      );
+    });
   });
 });
diff --git a/packages/ai-image-editor/src/shared/ui/canvas/UcAiCanvas.test.ts b/packages/ai-image-editor/src/shared/ui/canvas/UcAiCanvas.test.ts
index 2cad2ca..6a5eee8 100644
--- a/packages/ai-image-editor/src/shared/ui/canvas/UcAiCanvas.test.ts
+++ b/packages/ai-image-editor/src/shared/ui/canvas/UcAiCanvas.test.ts
@@ -1,4 +1,4 @@
-import { describe, expect, it, vi } from 'vitest';
+import { afterEach, describe, expect, it, vi } from 'vitest';
 import './UcAiCanvas';
 import type { UcAiCanvas } from './UcAiCanvas';
 
@@ -15,23 +15,22 @@ const preloadImg = (el: UcAiCanvas) => el.shadowRoot!.querySelector('img.preload
 const shownImg = (el: UcAiCanvas) => el.shadowRoot!.querySelector('img.canvas__image');
 const errorState = (el: UcAiCanvas) => el.shadowRoot!.querySelector('.error-state');
 const canvasEl = (el: UcAiCanvas) => el.shadowRoot!.querySelector('.canvas')!;
-const isEmpty = (el: UcAiCanvas) => canvasEl(el).classList.contains('is-empty');
-const isLoading = (el: UcAiCanvas) => canvasEl(el).classList.contains('is-loading');
+const canvasClasses = (el: UcAiCanvas) => canvasEl(el).classList;
 
 describe('UcAiCanvas', () => {
   it('preloads the new url before displaying it', async () => {
     const el = await mount('https://example.com/a.png');
     // Before load: empty state (dot grid shown), nothing displayed, preloader present.
-    expect(isEmpty(el)).toBe(true);
+    expect(canvasClasses(el)).toContain('is-empty');
     expect(shownImg(el)).toBeNull();
-    expect(preloadImg(el)).toBeTruthy();
+    expect(preloadImg(el)).not.toBeNull();
 
     preloadImg(el)!.dispatchEvent(new Event('load'));
     await el.updateComplete;
 
     // After load: the image is displayed, empty state cleared, preloader gone.
     expect(shownImg(el)?.getAttribute('src')).toBe('https://example.com/a.png');
-    expect(isEmpty(el)).toBe(false);
+    expect(canvasClasses(el)).not.toContain('is-empty');
     expect(preloadImg(el)).toBeNull();
   });
 
@@ -57,7 +56,7 @@ describe('UcAiCanvas', () => {
     el.ratio = 16 / 9;
     await el.updateComplete;
     // The frame element exists and is the box the image is cropped into.
-    expect(el.shadowRoot!.querySelector('.canvas__frame')).toBeTruthy();
+    expect(el.shadowRoot!.querySelector('.canvas__frame')).not.toBeNull();
   });
 
   describe('frame sizing', () => {
@@ -199,7 +198,7 @@ describe('UcAiCanvas', () => {
     const el = await mount('https://example.com/broken.png');
     preloadImg(el)!.dispatchEvent(new Event('error'));
     await el.updateComplete;
-    expect(errorState(el)).toBeTruthy();
+    expect(errorState(el)).not.toBeNull();
 
     el.url = 'https://example.com/fresh.png';
     await el.updateComplete;
@@ -210,11 +209,11 @@ describe('UcAiCanvas', () => {
 
   it('marks the canvas as loading while busy', async () => {
     const el = await mount(null);
-    expect(isLoading(el)).toBe(false);
+    expect(canvasClasses(el)).not.toContain('is-loading');
     el.busy = true;
     await el.updateComplete;
-    expect(isLoading(el)).toBe(true);
-    expect(isEmpty(el)).toBe(true);
+    expect(canvasClasses(el)).toContain('is-loading');
+    expect(canvasClasses(el)).toContain('is-empty');
   });
 
   describe('fullscreen button', () => {
@@ -228,6 +227,13 @@ describe('UcAiCanvas', () => {
       return requestFullscreen;
     }
 
+    // happy-dom has none of these, so removing them restores it; a stub left behind would show the button in a later test.
+    afterEach(() => {
+      Reflect.deleteProperty(document, 'fullscreenEnabled');
+      Reflect.deleteProperty(document, 'fullscreenElement');
+      Reflect.deleteProperty(HTMLElement.prototype, 'requestFullscreen');
+    });
+
     async function mountWithImage(): Promise<UcAiCanvas> {
       const el = await mount('https://example.com/a.png');
       el.fullscreenLabel = 'View fullscreen';
@@ -249,7 +255,7 @@ describe('UcAiCanvas', () => {
 
       preloadImg(el)!.dispatchEvent(new Event('load'));
       await el.updateComplete;
-      expect(fullscreenBtn(el)).toBeTruthy();
+      expect(fullscreenBtn(el)).not.toBeNull();
     });
 
     it('requests fullscreen on the canvas when clicked', async () => {
@@ -273,20 +279,16 @@ describe('UcAiCanvas', () => {
           }
         },
       );
-      try {
-        const el = await mountWithImage();
-        el.fullsizeUrl = 'https://example.com/full.png';
-        await el.updateComplete;
-
-        fullscreenBtn(el)!.dispatchEvent(new Event('mouseenter'));
-        expect(created).toEqual(['https://example.com/full.png']);
-
-        // Hovering again must not refetch the same url.
-        fullscreenBtn(el)!.dispatchEvent(new Event('mouseenter'));
-        expect(created).toHaveLength(1);
-      } finally {
-        vi.unstubAllGlobals();
-      }
+      const el = await mountWithImage();
+      el.fullsizeUrl = 'https://example.com/full.png';
+      await el.updateComplete;
+
+      fullscreenBtn(el)!.dispatchEvent(new Event('mouseenter'));
+      expect(created).toEqual(['https://example.com/full.png']);
+
+      // Hovering again must not refetch the same url.
+      fullscreenBtn(el)!.dispatchEvent(new Event('mouseenter'));
+      expect(created).toHaveLength(1);
     });
 
     it('overlays the fullsize rendition only while fullscreen', async () => {
diff --git a/packages/ai-image-editor/src/shared/ui/footer/UcAiFooter.test.ts b/packages/ai-image-editor/src/shared/ui/footer/UcAiFooter.test.ts
index e267c40..62665df 100644
--- a/packages/ai-image-editor/src/shared/ui/footer/UcAiFooter.test.ts
+++ b/packages/ai-image-editor/src/shared/ui/footer/UcAiFooter.test.ts
@@ -40,6 +40,6 @@ describe('UcAiFooter', () => {
 
   it('disables Done when primaryDisabled is set', async () => {
     const el = await mount({ primaryDisabled: true });
-    expect(primaryBtn(el)!.disabled).toBe(true);
+    expect(primaryBtn(el)).toHaveProperty('disabled', true);
   });
 });
diff --git a/packages/ai-image-editor/src/widgets/ai-image-editor-plugin/ui/AiImageEditorPlugin.test.ts b/packages/ai-image-editor/src/widgets/ai-image-editor-plugin/ui/AiImageEditorPlugin.test.ts
index 140722f..7b648ee 100644
--- a/packages/ai-image-editor/src/widgets/ai-image-editor-plugin/ui/AiImageEditorPlugin.test.ts
+++ b/packages/ai-image-editor/src/widgets/ai-image-editor-plugin/ui/AiImageEditorPlugin.test.ts
@@ -21,7 +21,6 @@ describe('aspectRatiosFromCropPreset', () => {
       [1, 1],
     ]);
     expect(warn).toHaveBeenCalled();
-    warn.mockRestore();
   });
 
   it('falls back to the popular set when only "free" is configured', () => {
diff --git a/packages/ai-image-editor/tests/contract/derivative.contract.test.ts b/packages/ai-image-editor/tests/contract/derivative.contract.test.ts
new file mode 100644
index 0000000..1286014
--- /dev/null
+++ b/packages/ai-image-editor/tests/contract/derivative.contract.test.ts
@@ -0,0 +1,58 @@
+import { assert, expect, it } from 'vitest';
+import { UploadcareApiClient, type UploadcareJobStatus } from '../../src/entities/provider/api/uploadcareApiClient';
+import { UploadcareDerivativeApi } from '../../src/entities/provider/api/uploadcareDerivativeApi';
+import { PRODUCTION_STATUS_SUCCESS, shapeOf } from '../fixtures/production-status-success';
+import { POLL_INTERVAL_MS, PUBLIC_KEY } from './setup';
+
+/** A well-formed uuid no project holds. */
+const ABSENT_UUID = '00000000-0000-4000-8000-000000000000';
+
+/** Polls `jobId` until it errors or its result is ready, for at most two minutes. */
+async function pollToEnd(client: UploadcareApiClient, jobId: string): Promise<UploadcareJobStatus> {
+  const deadline = Date.now() + 120_000;
+  for (;;) {
+    const status = await client.getJobStatus(jobId);
+    if ((status.status === 'success' && status.is_ready) || status.status === 'error' || Date.now() > deadline)
+      return status;
+    await new Promise((resolve) => setTimeout(resolve, POLL_INTERVAL_MS));
+  }
+}
+
+/**
+ * The one scenario that spends a generation: start it, poll it to a ready result, then read the file's info. Every
+ * request and response also passes the client's dev schemas (see `tests/schema-drift.ts`).
+ */
+it("generates an image at the requested ratio, ready in a success frame shaped like production's", async () => {
+  const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
+
+  const { job_id } = await client.generate({
+    prompt: 'a red apple on a white table',
+    aspectRatio: [3, 2],
+    filename: 'generated.png',
+    store: false,
+  });
+  const done = await pollToEnd(client, job_id!);
+
+  expect(shapeOf(done)).toEqual(shapeOf(PRODUCTION_STATUS_SUCCESS));
+  assert(done.status === 'success');
+  // Live sizes are the model's own (production drew 1248x832 for one request), so allow a pixel of rounding.
+  expect(done.image_info!.width / done.image_info!.height).toBeCloseTo(3 / 2, 2);
+
+  const info = await new UploadcareDerivativeApi({ publicKey: PUBLIC_KEY }).getFileInfo(done.uuid);
+  expect(info.imageInfo).toMatchObject({ width: done.image_info!.width, height: done.image_info!.height });
+});
+
+it('refuses the status of a job nobody started with job_not_found', async () => {
+  const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
+  await expect(client.getJobStatus(ABSENT_UUID)).rejects.toMatchObject({
+    name: 'AiProviderError',
+    errorCode: 'job_not_found',
+  });
+});
+
+it('refuses an edit of a file the project does not hold with source_not_found', async () => {
+  const client = new UploadcareApiClient({ publicKey: PUBLIC_KEY });
+  await expect(
+    client.edit({ prompt: 'add a hat', source: ABSENT_UUID, filename: 'edited.png', store: false }),
+  ).rejects.toMatchObject({ name: 'AiProviderError', errorCode: 'source_not_found' });
+});
diff --git a/packages/ai-image-editor/tests/contract/setup.ts b/packages/ai-image-editor/tests/contract/setup.ts
new file mode 100644
index 0000000..14e7138
--- /dev/null
+++ b/packages/ai-image-editor/tests/contract/setup.ts
@@ -0,0 +1,32 @@
+import { setupEmulator } from '@uploadcare/api-emulator/node';
+import { afterAll, beforeEach } from 'vitest';
+import { failOnSchemaDrift } from '../schema-drift';
+
+/**
+ * The contract tests run the same assertions against one of two targets: by default the emulator (part of
+ * `npm test`), or with `UC_CONTRACT_TARGET=live` the real `upload.uploadcare.com`, so a difference between the two
+ * fails one of them. A live run needs `UC_CONTRACT_PUBLIC_KEY`, a project with AI derivatives enabled and signed
+ * uploads off; without it the run fails rather than skipping, so missing credentials never look like a pass.
+ */
+export const LIVE = process.env.UC_CONTRACT_TARGET === 'live';
+
+function livePublicKey(): string {
+  const key = process.env.UC_CONTRACT_PUBLIC_KEY;
+  if (!key) throw new Error('UC_CONTRACT_TARGET=live needs UC_CONTRACT_PUBLIC_KEY');
+  return key;
+}
+
+export const PUBLIC_KEY = LIVE ? livePublicKey() : 'demopublickey';
+
+/** Live, a job takes seconds to finish; the emulator walks it in four instant polls. */
+export const POLL_INTERVAL_MS = LIVE ? 1500 : 0;
+
+if (!LIVE) {
+  const emulator = setupEmulator();
+  beforeEach(async () => {
+    await emulator.reset();
+  });
+  afterAll(() => emulator.stop());
+}
+
+failOnSchemaDrift();
diff --git a/packages/ai-image-editor/tests/editor/aspect-ratio.e2e.test.tsx b/packages/ai-image-editor/tests/editor/aspect-ratio.e2e.test.tsx
index c7cb9f0..c565d34 100644
--- a/packages/ai-image-editor/tests/editor/aspect-ratio.e2e.test.tsx
+++ b/packages/ai-image-editor/tests/editor/aspect-ratio.e2e.test.tsx
@@ -1,125 +1,124 @@
+import type { UploadcareFile } from '@uploadcare/upload-client';
 import { describe, expect, it, vi } from 'vitest';
-import { clickSend, editorMode, mount, SAMPLE_UUID, STAGING, stubFetch, typePrompt } from './harness';
-
-/** The ratio picker: what it offers per mode, what it sends, what it restores. */
+import { page, userEvent } from 'vitest/browser';
+import { session } from '../emulator';
+import {
+  clickDone,
+  editorRegion,
+  expectCanvasToShow,
+  generatedUuid,
+  historyChips,
+  mount,
+  SAMPLE_UUID,
+  STAGING,
+  sendPrompt,
+  type UcAiImageEditorType,
+} from './harness';
+
+/** The picker's trigger, named "Pick aspect ratio: <selection>". */
+const ratioTrigger = () => page.getByRole('button', { name: /^Pick aspect ratio/ });
+const ratioOptions = () => page.getByRole('listbox', { name: 'Pick aspect ratio' }).getByRole('option');
+
+/** Opens the picker and picks the option named `name`. */
+async function pickRatio(name: string): Promise<void> {
+  await userEvent.click(ratioTrigger());
+  await userEvent.click(ratioOptions().filter({ hasText: name }));
+}
+
+/**
+ * Waits for the run's result on the canvas, commits it, and returns the image info of the file `uc:done` hands the
+ * host. The emulator draws a result at the requested ratio (or keeps the source's size when none is sent), so the
+ * dimensions show which ratio the editor asked for.
+ */
+async function committedImage(el: UcAiImageEditorType): Promise<UploadcareFile['imageInfo']> {
+  await expectCanvasToShow(await generatedUuid());
+  const onDone = vi.fn();
+  el.addEventListener('uc:done', onDone);
+  await clickDone();
+  expect(onDone).toHaveBeenCalledOnce();
+  return (onDone.mock.calls[0]![0] as CustomEvent<{ file: UploadcareFile }>).detail.file.imageInfo;
+}
+
+/** A result's width over its height. */
+const ratioOf = (image: UploadcareFile['imageInfo']) => (image?.width ?? Number.NaN) / (image?.height ?? Number.NaN);
+
+/** The ratio picker: what it offers per mode, the shape of the image it produces, what it restores. */
 describe('<uc-ai-image-editor> aspect ratio', () => {
-  it('renders the aspect-ratio picker in generate mode (no Auto) and sends the selected ratio', async () => {
-    const stub = stubFetch();
-    const el = mount({ ...STAGING, 'aspect-ratios': '16:9 1:1' });
-    await el.updateComplete;
-
-    const ratio = el.shadowRoot!.querySelector('uc-ai-aspect-ratio')!;
-    expect(ratio).toBeTruthy();
+  it('renders the aspect-ratio picker in generate mode (no Auto) and generates at the selected ratio', async () => {
+    // 16:9: neither the generate default (3:2) nor the provider's fallback (1:1).
+    const el = mount({ ...STAGING, 'aspect-ratios': '3:2 16:9' });
 
     // Generate mode offers only the standard ratios — no "Auto".
-    (ratio.shadowRoot!.querySelector('.trigger') as HTMLButtonElement).click();
-    await el.updateComplete;
-    const options = Array.from(ratio.shadowRoot!.querySelectorAll('.option')) as HTMLButtonElement[];
-    expect(options.length).toBe(2);
-
-    // Pick the second option (1:1) before the only generate — sending flips to edit.
-    options[1]!.click();
-    await el.updateComplete;
-    typePrompt(el, 'mountain');
-    await el.updateComplete;
-    clickSend(el);
-    await vi.waitFor(() => expect(stub.generateBodies.length).toBe(1));
-    expect(stub.generateBodies[0]!.aspect_ratio).toEqual([1, 1]);
+    await userEvent.click(ratioTrigger());
+    await expect.poll(() => ratioOptions().elements()).toHaveLength(2);
+    await expect.element(ratioOptions().first()).toHaveTextContent('3:2');
+    await expect.element(ratioOptions().last()).toHaveTextContent('16:9');
+
+    // Pick 16:9 before the only generate — sending flips to edit.
+    await userEvent.click(ratioOptions().last());
+    await expect.element(ratioTrigger()).toHaveAccessibleName('Pick aspect ratio: 16:9');
+    await sendPrompt('mountain');
+    expect(ratioOf(await committedImage(el))).toBeCloseTo(16 / 9, 2);
   });
 
-  it('defaults edit mode to "Auto" and omits aspect_ratio (preserving the source AR)', async () => {
-    const stub = stubFetch({ uuid: 'edited' });
+  it('defaults edit mode to "Auto", which keeps the dimensions of the source image', async () => {
     const el = mount(STAGING);
     el.sourceUuid = SAMPLE_UUID;
-    await el.updateComplete;
-    expect(editorMode(el)).toBe('edit');
-
-    // The picker leads with an "Auto" entry (square icon, no w:h numbers).
-    const ratio = el.shadowRoot!.querySelector('uc-ai-aspect-ratio')!;
-    (ratio.shadowRoot!.querySelector('.trigger') as HTMLButtonElement).click();
-    await el.updateComplete;
-    const options = Array.from(ratio.shadowRoot!.querySelectorAll('.option')) as HTMLButtonElement[];
-    expect(options[0]!.textContent).toContain('Auto');
-    // "Auto" reserves the ratio column but shows no "w:h" numbers.
-    expect(options[0]!.querySelector('.option-ratio')?.textContent).toBe('');
-
-    typePrompt(el, 'add a hat');
-    await el.updateComplete;
-    clickSend(el);
-    await vi.waitFor(() => expect(stub.generateBodies.length).toBe(1));
-    // Auto is the default → no aspect_ratio on the wire; backend preserves it.
-    expect(stub.generateBodies[0]!.aspect_ratio).toBeUndefined();
-    expect(stub.generateBodies[0]!.source).toBe(SAMPLE_UUID);
+    await expect.element(editorRegion('edit')).toBeVisible();
+    await expect.element(ratioTrigger()).toHaveAccessibleName('Pick aspect ratio: Auto');
+
+    // The picker leads with an "Auto" entry, named without any w:h numbers.
+    await userEvent.click(ratioTrigger());
+    await expect.element(ratioOptions().first()).toHaveAccessibleName('Auto');
+    await expect.element(ratioOptions().first()).toHaveAttribute('aria-selected', 'true');
+    await userEvent.keyboard('{Escape}');
+
+    await sendPrompt('add a hat');
+    // Auto is the default → no aspect_ratio is sent, so the result keeps the source's size.
+    const source = session.files.get(SAMPLE_UUID)!.image!;
+    expect(await committedImage(el)).toMatchObject({ width: source.width, height: source.height });
   });
 
   it('renders the aspect-ratio picker in edit mode too', async () => {
     const el = mount(STAGING);
     el.sourceUuid = SAMPLE_UUID;
-    await el.updateComplete;
-    expect(editorMode(el)).toBe('edit');
-    expect(el.shadowRoot!.querySelector('uc-ai-aspect-ratio')).toBeTruthy();
+    await expect.element(editorRegion('edit')).toBeVisible();
+    await expect.element(ratioTrigger()).toBeVisible();
   });
 
-  it('sends an explicit ratio when the user reshapes in edit mode', async () => {
-    const stub = stubFetch({ uuid: 'edited' });
+  it('reshapes the result to a ratio the user picks in edit mode', async () => {
     const el = mount({ ...STAGING, 'aspect-ratios': '1:1' });
     el.sourceUuid = SAMPLE_UUID;
-    await el.updateComplete;
+    await expect.element(editorRegion('edit')).toBeVisible();
 
-    const ratio = el.shadowRoot!.querySelector('uc-ai-aspect-ratio')!;
-    (ratio.shadowRoot!.querySelector('.trigger') as HTMLButtonElement).click();
-    await el.updateComplete;
     // [Auto, 1:1] in edit mode — pick the concrete ratio to reshape.
-    const options = Array.from(ratio.shadowRoot!.querySelectorAll('.option')) as HTMLButtonElement[];
-    expect(options.length).toBe(2);
-    options[1]!.click();
-    await el.updateComplete;
-
-    typePrompt(el, 'make it square');
-    await el.updateComplete;
-    clickSend(el);
-    await vi.waitFor(() => expect(stub.generateBodies.length).toBe(1));
-    expect(stub.generateBodies[0]!.aspect_ratio).toEqual([1, 1]);
+    await userEvent.click(ratioTrigger());
+    await expect.poll(() => ratioOptions().elements()).toHaveLength(2);
+    await userEvent.click(ratioOptions().filter({ hasText: '1:1' }));
+    await expect.element(ratioTrigger()).toHaveAccessibleName('Pick aspect ratio: 1:1');
+
+    await sendPrompt('make it square');
+    // The source is not square, so a square result means the 1:1 was sent rather than Auto.
+    expect(ratioOf(await committedImage(el))).toBe(1);
   });
 
   it('records the aspect ratio on a history entry and restores it when re-selected', async () => {
-    stubFetch({ uuid: 'r1' });
     const el = mount({ ...STAGING, 'aspect-ratios': '16:9 1:1' });
-    await el.updateComplete;
-
-    const ratioEl = () => el.shadowRoot!.querySelector('uc-ai-aspect-ratio')!;
-    const selected = () => (ratioEl() as unknown as { selected: unknown }).selected;
-    const pickOption = async (i: number) => {
-      (ratioEl().shadowRoot!.querySelector('.trigger') as HTMLButtonElement).click();
-      await el.updateComplete;
-      (ratioEl().shadowRoot!.querySelectorAll('.option')[i] as HTMLButtonElement).click();
-      await el.updateComplete;
-    };
 
     // Generate with 1:1 (generate options are [16:9, 1:1]).
-    await pickOption(1);
-    expect(selected()).toEqual([1, 1]);
-    typePrompt(el, 'a cat');
-    await el.updateComplete;
-    clickSend(el);
-    await vi.waitFor(() => expect(editorMode(el)).toBe('edit'));
-    await el.updateComplete;
-
-    const history = el.shadowRoot!.querySelector('uc-ai-history') as unknown as {
-      entries: Array<{ ratio: unknown }>;
-    };
-    expect(history.entries[0]!.ratio).toEqual([1, 1]);
+    await pickRatio('1:1');
+    await expect.element(ratioTrigger()).toHaveAccessibleName('Pick aspect ratio: 1:1');
+    await sendPrompt('a cat');
+    await expect.element(editorRegion('edit')).toBeVisible();
+    await expect.element(historyChips().first()).toHaveAccessibleName('a cat');
+    expect(ratioOf(await committedImage(el))).toBe(1);
 
     // Change the ratio after the fact (edit options are [Auto, 16:9, 1:1]).
-    await pickOption(1);
-    expect(selected()).toEqual([16, 9]);
+    await pickRatio('16:9');
+    await expect.element(ratioTrigger()).toHaveAccessibleName('Pick aspect ratio: 16:9');
 
     // Re-selecting the history entry restores the 1:1 ratio it was made with.
-    const entry = history.entries[0];
-    el.shadowRoot!.querySelector('uc-ai-history')!.dispatchEvent(
-      new CustomEvent('uc:select', { detail: { entry }, bubbles: true, composed: true }),
-    );
-    await el.updateComplete;
-    expect(selected()).toEqual([1, 1]);
+    await userEvent.click(historyChips().first());
+    await expect.element(ratioTrigger()).toHaveAccessibleName('Pick aspect ratio: 1:1');
   });
 });
diff --git a/packages/ai-image-editor/tests/editor/auth-token.e2e.test.tsx b/packages/ai-image-editor/tests/editor/auth-token.e2e.test.tsx
index d53239e..548a359 100644
--- a/packages/ai-image-editor/tests/editor/auth-token.e2e.test.tsx
+++ b/packages/ai-image-editor/tests/editor/auth-token.e2e.test.tsx
@@ -1,128 +1,115 @@
-import { describe, expect, it, vi } from 'vitest';
+import { mintAuthToken } from '@uploadcare/api-emulator';
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { session } from '../emulator';
 import type { UcAiImageEditorType } from './harness';
-import { clickSend, installFetch, jsonResponse, mount, STAGING, successFrame, typePrompt } from './harness';
-
+import { historyChip, mount, STAGING, sendPrompt } from './harness';
+
+/**
+ * The project here has Signed Uploads on, so the emulator refuses every
+ * derivative request (the POST and each status poll) that carries no valid
+ * Bearer token: a run that finishes is itself proof every request was signed.
+ * What the header looks like is pinned by the `uploadcareApiClient` and
+ * `uploadcareDerivativeApi` specs.
+ */
 describe('<uc-ai-image-editor> authToken', () => {
-  /** Like `stubFetch`, but records the Authorization header of every request. */
-  function stubFetchCapturingAuth(): { auth: Array<string | null> } {
-    const auth: Array<string | null> = [];
-    installFetch((async (_input: RequestInfo | URL, init?: RequestInit) => {
-      auth.push(new Headers(init?.headers).get('Authorization'));
-      if ((init?.method ?? 'GET').toUpperCase() === 'POST') {
-        return jsonResponse({ type: 'job', job_id: 'job-1' });
-      }
-      return jsonResponse(successFrame('result'));
-    }) as typeof fetch);
-    return { auth };
-  }
+  beforeEach(() => {
+    session.use('signedUploads');
+  });
 
   /**
-   * Runs one generation and waits for its requests, counted rather than
-   * observed through the canvas: after the first run the canvas already holds
-   * the result URL, so waiting on it would return immediately and the second
-   * generation would never be awaited.
+   * Runs one generation and waits for its chip, named after the prompt, in the
+   * history: after the first run the canvas already holds a result, so waiting
+   * on it would return immediately and the second generation would never be
+   * awaited.
    */
-  const generate = async (el: UcAiImageEditorType, prompt: string, auth: Array<string | null>) => {
-    const before = auth.length;
-    typePrompt(el, prompt);
-    await el.updateComplete;
-    clickSend(el);
-    // The POST that starts the job, then at least one status GET.
-    await vi.waitFor(() => {
-      expect(auth.length).toBeGreaterThanOrEqual(before + 2);
-    });
-    await el.updateComplete;
+  const generate = async (prompt: string) => {
+    await sendPrompt(prompt);
+    await expect.element(historyChip(prompt)).toBeVisible();
   };
 
-  it.each([undefined, null, ''])('sends no Authorization header when authToken is %p', async (value) => {
-    // The common case: a project without signing. The provider gets no token
-    // function, so nothing has to stand in for a missing token.
-    const { auth } = stubFetchCapturingAuth();
+  /** Runs one generation and answers the `uc:error` the signing gate's refusal raises. */
+  const generateRefused = async (el: UcAiImageEditorType, prompt: string) => {
+    const onError = vi.fn();
+    el.addEventListener('uc:error', onError);
+    await sendPrompt(prompt);
+    await vi.waitFor(() => expect(onError).toHaveBeenCalledOnce());
+    el.removeEventListener('uc:error', onError);
+    return onError.mock.calls[0]![0].detail.error;
+  };
+
+  it.each([undefined, null, ''])('signs nothing when authToken is %p', async (value) => {
+    // No token function reaches the provider, so no header is sent at all: a
+    // missing header is SignatureRequiredError, while an empty 'Bearer ' would
+    // be AccessTokenInvalidError.
     const el = mount(STAGING);
     el.authToken = value as unknown as undefined;
     await el.updateComplete;
 
-    await generate(el, 'a tiger', auth);
-
-    expect(auth.length).toBeGreaterThan(1);
-    expect(auth.every((value) => value === null)).toBe(true);
+    expect((await generateRefused(el, 'a tiger')).code).toBe('SignatureRequiredError');
   });
 
   it('signs once authToken is set and stops once it is unset', async () => {
-    const { auth } = stubFetchCapturingAuth();
     const el = mount(STAGING);
-    el.authToken = 'eyJ.plain.sig';
     await el.updateComplete;
-    await generate(el, 'a tiger', auth);
-    const signed = auth.length;
+    expect((await generateRefused(el, 'a tiger')).code).toBe('SignatureRequiredError');
 
-    el.authToken = undefined;
+    el.authToken = await mintAuthToken({ tokenId: 'plain' });
     await el.updateComplete;
-    await generate(el, 'a lion', auth);
+    await generate('a lion');
 
-    expect(auth.slice(0, signed).every((value) => value === 'Bearer eyJ.plain.sig')).toBe(true);
-    expect(auth.slice(signed).every((value) => value === null)).toBe(true);
-  });
-
-  it('sends a plain token on every request', async () => {
-    const { auth } = stubFetchCapturingAuth();
-    const el = mount(STAGING);
-    el.authToken = 'eyJ.plain.sig';
+    el.authToken = undefined;
     await el.updateComplete;
-
-    await generate(el, 'a tiger', auth);
-
-    expect(auth.length).toBeGreaterThan(1);
-    expect(auth.every((value) => value === 'Bearer eyJ.plain.sig')).toBe(true);
+    expect((await generateRefused(el, 'a bear')).code).toBe('SignatureRequiredError');
   });
 
   it('calls an authToken function once and reuses the token across requests', async () => {
     // Standalone, the editor owns the cache: a generate makes several
     // authenticated requests and must not ask the app for a token each time.
-    const { auth } = stubFetchCapturingAuth();
-    const fetchToken = vi.fn(async () => 'eyJ.fetched.sig');
+    const token = await mintAuthToken({ tokenId: 'fetched' });
+    const fetchToken = vi.fn(async () => token);
     const el = mount(STAGING);
     el.authToken = fetchToken;
     await el.updateComplete;
 
-    await generate(el, 'a tiger', auth);
+    await generate('a tiger');
 
-    expect(auth.length).toBeGreaterThan(1);
-    expect(auth.every((value) => value === 'Bearer eyJ.fetched.sig')).toBe(true);
-    expect(fetchToken).toHaveBeenCalledTimes(1);
+    expect(fetchToken).toHaveBeenCalledOnce();
   });
 
   it('keeps the cached token when the function identity changes', async () => {
     // A React parent hands over a new closure on every render.
-    const { auth } = stubFetchCapturingAuth();
-    const first = vi.fn(async () => 'eyJ.first.sig');
+    const [firstToken, secondToken] = [
+      await mintAuthToken({ tokenId: 'first' }),
+      await mintAuthToken({ tokenId: 'second' }),
+    ];
+    const first = vi.fn(async () => firstToken);
     const el = mount(STAGING);
     el.authToken = first;
     await el.updateComplete;
-    await generate(el, 'a tiger', auth);
+    await generate('a tiger');
 
-    const second = vi.fn(async () => 'eyJ.second.sig');
+    const second = vi.fn(async () => secondToken);
     el.authToken = second;
     await el.updateComplete;
-    await generate(el, 'a lion', auth);
+    await generate('a lion');
 
+    expect(first).toHaveBeenCalledOnce();
     expect(second).not.toHaveBeenCalled();
-    expect(auth.every((value) => value === 'Bearer eyJ.first.sig')).toBe(true);
   });
 
   it('refetches after invalidateAuthToken()', async () => {
     // The escape hatch for a sign-out, and the only recovery when a token's
     // `exp` cannot be read and so never goes stale on its own.
-    const { auth } = stubFetchCapturingAuth();
-    const fetchToken = vi.fn(async () => 'eyJ.fetched.sig');
+    const token = await mintAuthToken({ tokenId: 'fetched' });
+    const fetchToken = vi.fn(async () => token);
     const el = mount(STAGING);
     el.authToken = fetchToken;
     await el.updateComplete;
-    await generate(el, 'a tiger', auth);
-    expect(fetchToken).toHaveBeenCalledTimes(1);
+    await generate('a tiger');
+    expect(fetchToken).toHaveBeenCalledOnce();
 
     el.invalidateAuthToken();
-    await generate(el, 'a lion', auth);
+    await generate('a lion');
 
     expect(fetchToken).toHaveBeenCalledTimes(2);
   });
@@ -130,14 +117,14 @@ describe('<uc-ai-image-editor> authToken', () => {
   it('does not cache when cacheAuthToken is false', async () => {
     // What the file-uploader plugin sets: the uploader already caches, so the
     // editor must resolve through to it rather than hold its own copy.
-    const { auth } = stubFetchCapturingAuth();
-    const fetchToken = vi.fn(async () => 'eyJ.fetched.sig');
+    const token = await mintAuthToken({ tokenId: 'fetched' });
+    const fetchToken = vi.fn(async () => token);
     const el = mount(STAGING);
     el.cacheAuthToken = false;
     el.authToken = fetchToken;
     await el.updateComplete;
 
-    await generate(el, 'a tiger', auth);
+    await generate('a tiger');
 
     expect(fetchToken.mock.calls.length).toBeGreaterThan(1);
   });
@@ -145,16 +132,15 @@ describe('<uc-ai-image-editor> authToken', () => {
   it('accepts a provider and lets it own the caching', async () => {
     // What the File Uploader plugin hands over: the uploader's cache, which
     // the editor must use rather than wrap in a second one.
-    const { auth } = stubFetchCapturingAuth();
-    const getToken = vi.fn(async () => 'eyJ.from.provider');
+    const token = await mintAuthToken({ tokenId: 'provider' });
+    const getToken = vi.fn(async () => token);
     const invalidate = vi.fn();
     const el = mount(STAGING);
     el.authToken = { getToken, invalidate };
     await el.updateComplete;
 
-    await generate(el, 'a tiger', auth);
+    await generate('a tiger');
 
-    expect(auth.every((value) => value === 'Bearer eyJ.from.provider')).toBe(true);
     // Called per request: the provider decides what to cache, not the editor.
     expect(getToken.mock.calls.length).toBeGreaterThan(1);
   });
@@ -168,6 +154,6 @@ describe('<uc-ai-image-editor> authToken', () => {
 
     el.invalidateAuthToken();
 
-    expect(invalidate).toHaveBeenCalledTimes(1);
+    expect(invalidate).toHaveBeenCalledOnce();
   });
 });
diff --git a/packages/ai-image-editor/tests/editor/filename.e2e.test.tsx b/packages/ai-image-editor/tests/editor/filename.e2e.test.tsx
index 99bdaca..15c1f99 100644
--- a/packages/ai-image-editor/tests/editor/filename.e2e.test.tsx
+++ b/packages/ai-image-editor/tests/editor/filename.e2e.test.tsx
@@ -1,11 +1,27 @@
 import type { UploadcareFile } from '@uploadcare/upload-client';
 import { describe, expect, it, vi } from 'vitest';
-import { clickSend, editorMode, mount, SAMPLE_UUID, STAGING, stubFetch, typePrompt } from './harness';
+import type { UcAiImageEditorType } from './harness';
+import { clickDone, doneButton, editorRegion, mount, SAMPLE_UUID, STAGING, sendPrompt } from './harness';
 
-/** What the result is named: the source's name, a resolver, or a fixed string. */
+/**
+ * What the result is named: the source's name, a resolver, or a fixed string.
+ * The emulator stores a result under the name the editor asked for, so the
+ * committed file's `originalFilename` is the name the run produced.
+ */
 describe('<uc-ai-image-editor> result filename', () => {
+  /** Runs the test's one generation, commits it, and answers the committed file's name. */
+  const producedFilename = async (el: UcAiImageEditorType, prompt: string) => {
+    await sendPrompt(prompt);
+    // The primary commits a result, so it is enabled once the run has one.
+    await expect.element(doneButton()).toBeEnabled();
+    const onDone = vi.fn();
+    el.addEventListener('uc:done', onDone);
+    await clickDone();
+    expect(onDone).toHaveBeenCalledOnce();
+    return (onDone.mock.calls[0]![0].detail.file as UploadcareFile).originalFilename;
+  };
+
   it('names the result after the source file in edit mode (preserves the original name)', async () => {
-    const stub = stubFetch({ uuid: 'edited' });
     const el = mount(STAGING);
     // Inject the source's file info (as the plugin does) — it carries the uuid
     // (→ edit mode) and its originalFilename is the default output name.
@@ -14,23 +30,17 @@ describe('<uc-ai-image-editor> result filename', () => {
       originalFilename: 'holiday-photo.jpg',
       imageInfo: null,
     } as unknown as UploadcareFile;
-    await el.updateComplete;
-    expect(editorMode(el)).toBe('edit');
+    await expect.element(editorRegion('edit')).toBeVisible();
 
-    typePrompt(el, 'add a hat');
-    await el.updateComplete;
-    clickSend(el);
-    await vi.waitFor(() => expect(stub.generateBodies.length).toBe(1));
     // The edit result is named after the source, not the provider's default.
-    expect(stub.generateBodies[0]!.filename).toBe('holiday-photo.jpg');
+    expect(await producedFilename(el, 'add a hat')).toBe('holiday-photo.jpg');
   });
 
   it('names the result via the outputFilename resolver (original + counter)', async () => {
-    const stub = stubFetch({ uuid: 'r1' });
     const el = mount(STAGING);
-    // A fresh uuid with no persisted lineage → counter starts at 1.
+    // History is cleared after every test, so the source has no persisted lineage → counter starts at 1.
     el.sourceFileInfo = {
-      uuid: 'resolver-test-uuid-0001',
+      uuid: SAMPLE_UUID,
       originalFilename: 'cat.png',
       imageInfo: null,
     } as unknown as UploadcareFile;
@@ -38,23 +48,14 @@ describe('<uc-ai-image-editor> result filename', () => {
     el.outputFilename = (original, counter) => `${original ?? 'ai'}-edit-${counter}`;
     await el.updateComplete;
 
-    typePrompt(el, 'add a hat');
-    await el.updateComplete;
-    clickSend(el);
-    await vi.waitFor(() => expect(stub.generateBodies.length).toBe(1));
-    expect(stub.generateBodies[0]!.filename).toBe('cat.png-edit-1');
+    expect(await producedFilename(el, 'add a hat')).toBe('cat.png-edit-1');
   });
 
   it('uses a static outputFilename string verbatim', async () => {
-    const stub = stubFetch({ uuid: 'r1' });
     const el = mount(STAGING);
     el.outputFilename = 'my-art.png';
     await el.updateComplete;
 
-    typePrompt(el, 'a sunset');
-    await el.updateComplete;
-    clickSend(el);
-    await vi.waitFor(() => expect(stub.generateBodies.length).toBe(1));
-    expect(stub.generateBodies[0]!.filename).toBe('my-art.png');
+    expect(await producedFilename(el, 'a sunset')).toBe('my-art.png');
   });
 });
diff --git a/packages/ai-image-editor/tests/editor/generation.e2e.test.tsx b/packages/ai-image-editor/tests/editor/generation.e2e.test.tsx
index cb4296c..ae757ae 100644
--- a/packages/ai-image-editor/tests/editor/generation.e2e.test.tsx
+++ b/packages/ai-image-editor/tests/editor/generation.e2e.test.tsx
@@ -1,15 +1,19 @@
 import { describe, expect, it, vi } from 'vitest';
+import { page, userEvent } from 'vitest/browser';
+import { session } from '../emulator';
 import {
-  canvasUrl,
-  clickPrimary,
-  clickSend,
-  editorMode,
+  canvasImage,
+  clickDone,
+  doneButton,
+  editorRegion,
+  expectCanvasToShow,
+  generatedUuid,
   mount,
-  primaryBtn,
+  promptBox,
   SAMPLE_UUID,
+  SECOND_SAMPLE_UUID,
   STAGING,
-  stubFetch,
-  typePrompt,
+  sendPrompt,
 } from './harness';
 
 /**
@@ -18,104 +22,77 @@ import {
  */
 describe('<uc-ai-image-editor> generation', () => {
   it('auto-enters edit mode after the first successful generation', async () => {
-    stubFetch({ uuid: 'result' });
-    const el = mount(STAGING);
-    await el.updateComplete;
-    expect(editorMode(el)).toBe('generate');
-    typePrompt(el, 'a tiger');
-    await el.updateComplete;
-    clickSend(el);
-    await vi.waitFor(() => expect(canvasUrl(el)).toBe('https://cdn.example.com/result/'));
-    await el.updateComplete;
-    expect(editorMode(el)).toBe('edit');
+    mount(STAGING);
+    await expect.element(editorRegion('generate')).toBeVisible();
+    await sendPrompt('a tiger');
+    await expectCanvasToShow(await generatedUuid());
+    await expect.element(editorRegion('edit')).toBeVisible();
   });
 
   it('clears the prompt after a successful generation', async () => {
-    stubFetch({ uuid: 'result' });
-    const el = mount(STAGING);
-    await el.updateComplete;
-    const input = el.shadowRoot!.querySelector('uc-ai-prompt-row')!.shadowRoot!.querySelector('textarea')!;
-    typePrompt(el, 'a tiger');
-    await el.updateComplete;
-    clickSend(el);
-    await vi.waitFor(() => expect(canvasUrl(el)).toBe('https://cdn.example.com/result/'));
-    await el.updateComplete;
-    expect(input.value).toBe('');
+    mount(STAGING);
+    await sendPrompt('a tiger');
+    await expectCanvasToShow(await generatedUuid());
+    await expect.element(promptBox()).toHaveValue('');
   });
 
-  it('generates via the send button, then the primary commits the result with uc:done', async () => {
-    stubFetch({ uuid: 'result' });
+  it('commits the generated result with uc:done, carrying its url, uuid and UploadcareFile', async () => {
     const el = mount(STAGING);
-    await el.updateComplete;
-
-    // Primary is disabled until there is a result to commit.
-    expect(primaryBtn(el).disabled).toBe(true);
-
-    typePrompt(el, 'a tiger');
-    await el.updateComplete;
-    clickSend(el);
-    await vi.waitFor(() => {
-      expect(canvasUrl(el)).toBe('https://cdn.example.com/result/');
-    });
-    await el.updateComplete;
-
-    // Now the primary commits the generated result (it never generates).
-    expect(primaryBtn(el).disabled).toBe(false);
     const onDone = vi.fn();
     el.addEventListener('uc:done', onDone);
-    clickPrimary(el);
-    expect(onDone).toHaveBeenCalledTimes(1);
-    const detail = onDone.mock.calls[0]![0].detail;
-    expect(detail.url).toBe('https://cdn.example.com/result/');
-    expect(detail.file.uuid).toBe('result');
-    expect(detail.file.cdnUrl).toBe('https://cdn.example.com/result/');
+
+    await sendPrompt('a tiger');
+    const uuid = await generatedUuid();
+    await expectCanvasToShow(uuid);
+    // The primary commits the result; it never generates.
+    await clickDone();
+
+    expect(onDone).toHaveBeenCalledOnce();
+    expect(onDone.mock.calls[0]![0].detail).toMatchObject({
+      url: `https://cdn.example.com/${uuid}/`,
+      uuid,
+      file: { uuid, cdnUrl: `https://cdn.example.com/${uuid}/` },
+    });
   });
 
-  it('includes the UploadcareFile and its uuid in uc:done after a generation', async () => {
-    stubFetch({ uuid: 'result-123' });
+  it('reports a refused run with uc:error and its message, and keeps the prompt', async () => {
+    // derivativesInstant again, so it wraps the failure and the error comes on the first poll.
+    session.use('derivativeFailure', { code: 'content_moderated' }).use('derivativesInstant');
     const el = mount(STAGING);
-    await el.updateComplete;
-    const onDone = vi.fn();
-    el.addEventListener('uc:done', onDone);
-
-    typePrompt(el, 'make it pop');
-    await el.updateComplete;
-    clickSend(el);
-    await vi.waitFor(() => expect(canvasUrl(el)).toBe('https://cdn.example.com/result-123/'));
-    await el.updateComplete;
-
-    clickPrimary(el);
-    expect(onDone).toHaveBeenCalledTimes(1);
-    expect(onDone.mock.calls[0]![0].detail.file.uuid).toBe('result-123');
-    expect(onDone.mock.calls[0]![0].detail.uuid).toBe('result-123');
+    const onError = vi.fn();
+    el.addEventListener('uc:error', onError);
+
+    await sendPrompt('a tiger');
+    await expect
+      .element(page.getByRole('alert'))
+      .toHaveTextContent("That prompt isn't allowed. Try describing it differently.");
+
+    expect(onError).toHaveBeenCalledOnce();
+    expect(onError.mock.calls[0]![0].detail.error.code).toBe('content_moderated');
+    await expect.element(canvasImage()).not.toBeInTheDocument();
+    await expect.element(editorRegion('generate')).toBeVisible();
+    await expect.element(promptBox()).toHaveValue('a tiger');
   });
 
-  it.skip('fires uc:change as the current result appears and clears', async () => {
-    stubFetch({ uuid: 'result' });
+  it('fires uc:change with the result when a run lands, and with null when a new source clears it', async () => {
     const el = mount(STAGING);
-    await el.updateComplete;
     const onChange = vi.fn();
     el.addEventListener('uc:change', onChange);
 
-    typePrompt(el, 'a tiger');
-    await el.updateComplete;
-    clickSend(el);
-    await vi.waitFor(() => {
-      expect(onChange).toHaveBeenCalledTimes(1);
+    await sendPrompt('a tiger');
+    const uuid = await generatedUuid();
+    await expectCanvasToShow(uuid);
+    expect(onChange).toHaveBeenCalledOnce();
+    expect(onChange.mock.calls[0]![0].detail.result).toMatchObject({
+      url: `https://cdn.example.com/${uuid}/`,
+      file: { uuid },
     });
-    const first = onChange.mock.calls[0]![0].detail;
-    expect(first.result.url).toBe('https://cdn.example.com/result/');
-    expect(first.result.file.uuid).toBe('result');
 
-    // Start over clears the current result -> uc:change with null.
-    await el.updateComplete;
-    const history = el.shadowRoot!.querySelector('uc-ai-history')!;
-    const startOver = history.shadowRoot!.querySelector('.startover__btn') as HTMLButtonElement;
-    startOver.click();
-    await vi.waitFor(() => {
-      expect(onChange).toHaveBeenCalledTimes(2);
-    });
-    expect(onChange.mock.calls[1]![0].detail.result).toBeNull();
+    // A host handing over another image drops the result: that source has no history to resume.
+    el.sourceUuid = SAMPLE_UUID;
+    await expectCanvasToShow(SAMPLE_UUID);
+    expect(onChange).toHaveBeenCalledTimes(2);
+    expect(onChange.mock.calls[1]![0].detail).toEqual({ result: null });
   });
 
   it('dispatches uc:cancel when the cancel button is clicked', async () => {
@@ -123,70 +100,59 @@ describe('<uc-ai-image-editor> generation', () => {
     await el.updateComplete;
     const onCancel = vi.fn();
     el.addEventListener('uc:cancel', onCancel);
-    const footer = el.shadowRoot!.querySelector('uc-ai-footer')!;
-    (footer.shadowRoot!.querySelector('.btn--ghost') as HTMLButtonElement).click();
-    expect(onCancel).toHaveBeenCalledTimes(1);
+    await userEvent.click(page.getByRole('button', { name: 'Cancel', exact: true }));
+    expect(onCancel).toHaveBeenCalledOnce();
   });
 
   it('keeps the primary disabled and fires no uc:done until a result exists (edit mode with a source)', async () => {
     const el = mount(STAGING);
     el.sourceUuid = SAMPLE_UUID;
-    await el.updateComplete;
-    expect(editorMode(el)).toBe('edit');
+    await expect.element(editorRegion('edit')).toBeVisible();
+    await expectCanvasToShow(SAMPLE_UUID);
     const onDone = vi.fn();
     el.addEventListener('uc:done', onDone);
     // A source image alone is not a result — the primary commits results only.
-    expect(primaryBtn(el).disabled).toBe(true);
-    clickPrimary(el);
+    await expect.element(doneButton()).toBeDisabled();
+    await userEvent.click(doneButton(), { force: true });
     expect(onDone).not.toHaveBeenCalled();
   });
 
   it('does not dispatch uc:done when there is no result (generate mode)', async () => {
     const el = mount();
-    await el.updateComplete;
     const onDone = vi.fn();
     el.addEventListener('uc:done', onDone);
-    expect(primaryBtn(el).disabled).toBe(true);
-    primaryBtn(el).click();
+    await expect.element(doneButton()).toBeDisabled();
+    await userEvent.click(doneButton(), { force: true });
     expect(onDone).not.toHaveBeenCalled();
   });
 
   it('applies an async secure-delivery resolver to the canvas preview', async () => {
-    stubFetch({ uuid: 'result' });
     const el = mount(STAGING);
-    el.secureDeliveryProxyUrlResolver = async (url: string) => `https://signed.example/${encodeURIComponent(url)}`;
-    await el.updateComplete;
-    typePrompt(el, 'a tiger');
-    await el.updateComplete;
-    clickSend(el);
-    const raw = 'https://cdn.example.com/result/';
-    await vi.waitFor(() => expect(canvasUrl(el)).toBe(`https://signed.example/${encodeURIComponent(raw)}`));
+    // The signed URL stays on the emulated CDN, so the preview loads instead of reaching for a proxy that doesn't exist.
+    el.secureDeliveryProxyUrlResolver = async (url: string) => `${url}?token=signed`;
+    await sendPrompt('a tiger');
+    const uuid = await generatedUuid();
+    await expect
+      .element(canvasImage())
+      .toHaveAttribute(
+        'src',
+        expect.stringMatching(new RegExp(`^https://cdn\\.example\\.com/${uuid}/.*\\?token=signed$`)),
+      );
   });
 
   it('aborts in-flight generation and shows the new source when source changes', async () => {
-    // Status hangs until the request is aborted.
-    stubFetch({
-      status: (signal) =>
-        new Promise((_res, rej) => {
-          signal?.addEventListener('abort', () => rej(new DOMException('Aborted', 'AbortError')), { once: true });
-        }),
-    });
-    // Non-UUID-shaped ids keep the CDN preview helper from rewriting the URL,
-    // so the canvas URL is the bare resolved source.
-    const el = mount({ ...STAGING, 'source-uuid': 'first-uuid' });
-    await el.updateComplete;
-
-    typePrompt(el, 'try');
-    await el.updateComplete;
-    clickSend(el);
+    // The status poll never answers, so the job is still running when the source changes.
+    session.on('GET /derivative/status/', () => new Promise<never>(() => {}));
+    const el = mount({ ...STAGING, 'source-uuid': SAMPLE_UUID });
+    await sendPrompt('try');
+    // The prompt box locks while the run is in flight.
+    await expect.element(promptBox()).toBeDisabled();
 
     // Change source mid-flight — this aborts the in-flight generation.
-    el.sourceUuid = 'second-uuid';
-    await el.updateComplete;
+    el.sourceUuid = SECOND_SAMPLE_UUID;
 
     // After the abort, the displayed image should be the new source (no result override).
-    await vi.waitFor(() => {
-      expect(canvasUrl(el)).toBe('https://cdn.example.com/second-uuid/');
-    });
+    await expectCanvasToShow(SECOND_SAMPLE_UUID);
+    await expect.element(promptBox()).toBeEnabled();
   });
 });
diff --git a/packages/ai-image-editor/tests/editor/harness.ts b/packages/ai-image-editor/tests/editor/harness.ts
index fc8f358..2297890 100644
--- a/packages/ai-image-editor/tests/editor/harness.ts
+++ b/packages/ai-image-editor/tests/editor/harness.ts
@@ -1,90 +1,39 @@
-import { afterEach } from 'vitest';
-import { page } from 'vitest/browser';
+import { ADAPTIVE_IMAGE_UUID, DEMO_FILES, DEMO_IMAGE_UUID } from '@uploadcare/api-emulator';
+import { afterEach, beforeEach, expect } from 'vitest';
+import { page, userEvent } from 'vitest/browser';
 import type { UcAiImageEditor as UcAiImageEditorType } from '../../src/index';
 import { UcAiImageEditor } from '../../src/index';
+import { session } from '../emulator';
 import { cleanup } from '../test-renderer';
 
 /**
  * Shared setup for the `<uc-ai-image-editor>` browser tests, which are split by
  * subject (mounting, generation, history, layout, …) and all need the same
- * three things: the elements registered, a stubbed Upload API, and a mounted
- * editor. Importing this module registers the custom elements and the teardown
- * for whichever test file pulls it in.
+ * three things: the elements registered, the Upload API (the emulator, see
+ * `tests/emulator.ts`), and a mounted editor. Importing this module registers
+ * the custom elements and the teardown for whichever test file pulls it in.
  */
 export { UcAiImageEditor };
 export type { UcAiImageEditorType };
 
-let restoreFetch: (() => void) | null = null;
+/**
+ * Generations finish on their first status poll, so a test doesn't sit through the editor's 1.5s interval.
+ *
+ * Order matters: a preset or `session.on` answers before the ones registered earlier, and derivativesInstant only
+ * speeds up the scenarios registered *before* it (see the emulator README's preset table). A test that adds its own
+ * status scenario, `derivativeFailure` say, applies derivativesInstant again after it to keep instant answers.
+ */
+beforeEach(() => {
+  session.use('derivativesInstant');
+});
 
 afterEach(() => {
-  restoreFetch?.();
-  restoreFetch = null;
   // Persisted history is namespaced by pubkey in localStorage; clear it so a
   // seeded/recorded lineage in one test can't leak into the next.
   localStorage.clear();
   cleanup();
 });
 
-export const jsonResponse = (body: unknown): Response =>
-  new Response(JSON.stringify(body), { status: 200, headers: { 'Content-Type': 'application/json' } });
-
-/** A finished job frame, as `derivative/status/` returns it. */
-export const successFrame = (uuid: string): Record<string, unknown> => ({
-  status: 'success',
-  uuid,
-  file_id: uuid,
-  size: 1,
-  done: 1,
-  total: 1,
-  original_filename: 'generated.png',
-  filename: 'generated.png',
-  mime_type: 'image/png',
-  is_image: true,
-  is_stored: false,
-  is_ready: true,
-  image_info: null,
-  video_info: null,
-  content_info: null,
-  metadata: {},
-});
-
-/**
- * Swap `globalThis.fetch` for the rest of the test. The provider binds
- * `globalThis.fetch` at construction, so install a stub BEFORE setting `pubkey`.
- */
-export function installFetch(handler: typeof fetch): void {
-  // Put back a stub this test already installed, so `real` is always the real
-  // one — otherwise teardown would restore a stub and every later test in the
-  // file would run against it.
-  restoreFetch?.();
-  const real = globalThis.fetch;
-  globalThis.fetch = handler;
-  restoreFetch = () => {
-    globalThis.fetch = real;
-  };
-}
-
-/**
- * Drive the internal UploadcareDerivativeApi: the generate POST returns a job,
- * the status GET returns success (or a custom handler). Captures the POST
- * bodies for assertions.
- */
-export function stubFetch(opts: { uuid?: string; status?: (signal?: AbortSignal) => Promise<Response> } = {}): {
-  generateBodies: Array<Record<string, unknown>>;
-} {
-  const generateBodies: Array<Record<string, unknown>> = [];
-  installFetch((async (_input: RequestInfo | URL, init?: RequestInit) => {
-    const method = (init?.method ?? 'GET').toUpperCase();
-    if (method === 'POST') {
-      generateBodies.push(JSON.parse((init?.body as string) ?? '{}'));
-      return jsonResponse({ type: 'job', job_id: 'job-1' });
-    }
-    if (opts.status) return opts.status(init?.signal ?? undefined);
-    return jsonResponse(successFrame(opts.uuid ?? 'result'));
-  }) as typeof fetch);
-  return { generateBodies };
-}
-
 export function mount(attrs: Record<string, string> = {}): UcAiImageEditorType {
   const el = document.createElement('uc-ai-image-editor') as UcAiImageEditorType;
   for (const [k, v] of Object.entries(attrs)) el.setAttribute(k, v);
@@ -100,35 +49,58 @@ export function mount(attrs: Record<string, string> = {}): UcAiImageEditorType {
 
 export const STAGING = { pubkey: 'demopublickey', 'cdn-cname': 'https://cdn.example.com' };
 
-export const SAMPLE_UUID = '11111111-2222-3333-4444-555555555555';
+/** An image every fresh emulator session already holds: a stored 136×150 JPEG (not square). */
+export const SAMPLE_UUID = DEMO_IMAGE_UUID;
 
-export function typePrompt(el: UcAiImageEditorType, value: string): void {
-  const input = el.shadowRoot!.querySelector('uc-ai-prompt-row')!.shadowRoot!.querySelector('textarea')!;
-  input.value = value;
-  input.dispatchEvent(new Event('input', { bubbles: true }));
-}
+/** A second seeded image, for a test that switches sources: the same bytes as `SAMPLE_UUID` under another uuid. */
+export const SECOND_SAMPLE_UUID = ADAPTIVE_IMAGE_UUID;
 
-export function primaryBtn(el: UcAiImageEditorType): HTMLButtonElement {
-  return el.shadowRoot!.querySelector('uc-ai-footer')!.shadowRoot!.querySelector('.btn--primary') as HTMLButtonElement;
-}
+/** The file the test's run produced: the one in the session that isn't a seeded `DEMO_FILES` image. */
+export const resultUuid = (): string | undefined =>
+  [...session.files.keys()].find((uuid) => !DEMO_FILES.includes(uuid));
 
-/** Footer primary commits the result (fires uc:done). */
-export function clickPrimary(el: UcAiImageEditorType): void {
-  primaryBtn(el).click();
-}
+/*
+ * The editor as a user finds it: by role and accessible name, through its shadow roots (locators pierce open ones).
+ * The names are the English strings, written out so a changed label fails here rather than following the source.
+ */
 
-/** The prompt row's send button triggers generation. */
-export function clickSend(el: UcAiImageEditorType): void {
-  const promptRow = el.shadowRoot!.querySelector('uc-ai-prompt-row')!;
-  (promptRow.shadowRoot!.querySelector('.send') as HTMLButtonElement).click();
-}
+/** The prompt box, named after the mode's placeholder. */
+export const promptBox = () => page.getByRole('textbox');
+
+/** The prompt row's send button. It is hidden until the prompt holds text. */
+export const sendButton = () => page.getByRole('button', { name: 'Generate', exact: true });
+
+/** The footer's primary, which commits the result (fires `uc:done`). */
+export const doneButton = () => page.getByRole('button', { name: 'Done', exact: true });
+
+/** The editor's region, named after its mode. */
+export const editorRegion = (mode: 'generate' | 'edit') =>
+  page.getByRole('region', { name: mode === 'edit' ? 'Edit image' : 'Generate image', exact: true });
 
-export const historyEl = (el: UcAiImageEditorType) =>
-  el.shadowRoot!.querySelector('uc-ai-history') as (HTMLElement & { entries: unknown[] }) | null;
+/** The canvas's picture. Thumbnails and preloads are hidden from the accessibility tree, so it is the only image. */
+export const canvasImage = () => page.getByRole('img');
 
-export const canvasUrl = (el: UcAiImageEditorType): string | null =>
-  (el.shadowRoot!.querySelector('uc-ai-canvas') as unknown as { url: string | null }).url;
+/** The result chips in the history strip, each named after the prompt that made it. */
+export const historyChips = () => page.getByRole('toolbar', { name: 'Recent prompts' }).getByRole('button');
+
+/** The history chip of the run that `prompt` made. */
+export const historyChip = (prompt: string) =>
+  page.getByRole('toolbar', { name: 'Recent prompts' }).getByRole('button', { name: prompt, exact: true });
+
+export const clickDone = () => userEvent.click(doneButton());
+
+/** Types the prompt and sends it. */
+export async function sendPrompt(value: string): Promise<void> {
+  await userEvent.fill(promptBox(), value);
+  await userEvent.click(sendButton());
+}
+
+/** Waits for the run's result to land in the session and answers its uuid. */
+export async function generatedUuid(): Promise<string> {
+  await expect.poll(resultUuid).toBeDefined();
+  return resultUuid()!;
+}
 
-/** The derived editor mode, read off the prompt-row child the editor feeds. */
-export const editorMode = (el: UcAiImageEditorType): string =>
-  (el.shadowRoot!.querySelector('uc-ai-prompt-row') as unknown as { mode: string }).mode;
+/** Waits for the canvas to show the CDN rendition of `uuid`. */
+export const expectCanvasToShow = (uuid: string) =>
+  expect.element(canvasImage()).toHaveAttribute('src', expect.stringContaining(`https://cdn.example.com/${uuid}/`));
diff --git a/packages/ai-image-editor/tests/editor/history.e2e.test.tsx b/packages/ai-image-editor/tests/editor/history.e2e.test.tsx
index b0fe7d4..6634eae 100644
--- a/packages/ai-image-editor/tests/editor/history.e2e.test.tsx
+++ b/packages/ai-image-editor/tests/editor/history.e2e.test.tsx
@@ -1,15 +1,15 @@
 import type { UploadcareFile } from '@uploadcare/upload-client';
-import { describe, expect, it, vi } from 'vitest';
+import { describe, expect, it } from 'vitest';
 import {
-  canvasUrl,
-  clickSend,
-  editorMode,
-  historyEl,
+  canvasImage,
+  editorRegion,
+  expectCanvasToShow,
+  historyChips,
   mount,
   SAMPLE_UUID,
+  SECOND_SAMPLE_UUID,
   STAGING,
-  stubFetch,
-  typePrompt,
+  sendPrompt,
 } from './harness';
 
 /**
@@ -18,32 +18,17 @@ import {
  */
 describe('<uc-ai-image-editor> history', () => {
   it('populates the history strip after a successful generation', async () => {
-    stubFetch();
-    const el = mount(STAGING);
-    await el.updateComplete;
-    typePrompt(el, 'a tiger');
-    await el.updateComplete;
-    clickSend(el);
-    await vi.waitFor(() => {
-      expect(historyEl(el)?.entries.length).toBe(1);
-    });
+    mount(STAGING);
+    await sendPrompt('a tiger');
+    await expect.poll(() => historyChips().elements()).toHaveLength(1);
   });
 
-  it('shows the generated result as a selectable history chip', async () => {
-    stubFetch();
-    const el = mount(STAGING);
-    await el.updateComplete;
-    typePrompt(el, 'a tiger');
-    await el.updateComplete;
-    clickSend(el);
-    await vi.waitFor(() => expect(historyEl(el)?.entries.length).toBe(1));
-    await el.updateComplete;
-
-    const history = historyEl(el)!;
-    const chips = history.shadowRoot!.querySelectorAll('.chip');
-    expect(chips.length).toBe(1);
+  it('shows the generated result as a selected history chip named after its prompt', async () => {
+    mount(STAGING);
+    await sendPrompt('a tiger');
     // The current result's chip is marked selected.
-    expect(history.shadowRoot!.querySelector('.chip--selected')).toBeTruthy();
+    await expect.element(historyChips().first()).toHaveAccessibleName('a tiger');
+    await expect.element(historyChips().first()).toHaveAttribute('aria-pressed', 'true');
   });
 
   it('shows and persists the original image in the history strip when editing (plugin path)', async () => {
@@ -51,16 +36,14 @@ describe('<uc-ai-image-editor> history', () => {
     const el = mount(STAGING);
     // The plugin hands the editor the source's file info directly.
     el.sourceFileInfo = { uuid: SAMPLE_UUID } as UploadcareFile;
-    await el.updateComplete;
-    await vi.waitFor(() => expect(editorMode(el)).toBe('edit'));
+    await expect.element(editorRegion('edit')).toBeVisible();
 
     // The strip mounts with the original as its base entry — the starting point
-    // you can revert to — once the source's display url has resolved.
-    await vi.waitFor(() => {
-      const strip = historyEl(el) as (HTMLElement & { entries: Array<{ file: { uuid: string } }> }) | null;
-      expect(strip).not.toBeNull();
-      expect(strip!.entries.some((entry) => entry.file.uuid === SAMPLE_UUID)).toBe(true);
-    });
+    // you can revert to — once the source's display url has resolved: one
+    // selected chip showing the source's thumbnail.
+    await expect.poll(() => historyChips().elements()).toHaveLength(1);
+    await expect.element(historyChips().first()).toHaveAttribute('aria-pressed', 'true');
+    await expect.poll(() => historyChips().element().querySelector('img')?.src).toContain(`/${SAMPLE_UUID}/`);
 
     // …and the original is persisted as a root node so it survives a reload.
     const stored = JSON.parse(localStorage.getItem(`uc-ai-image-editor/history/${STAGING.pubkey}`) ?? '{}');
@@ -68,7 +51,8 @@ describe('<uc-ai-image-editor> history', () => {
   });
 
   it('resumes on the latest result (not the original) when reopening a lineage', async () => {
-    const LATEST = 'aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee';
+    // A seeded image, so the CDN serves it and the canvas can show it.
+    const LATEST = SECOND_SAMPLE_UUID;
     const key = `uc-ai-image-editor/history/${STAGING.pubkey}`;
     // Seed a prior edit of SAMPLE_UUID into storage (a result whose parent is it).
     localStorage.setItem(
@@ -89,45 +73,10 @@ describe('<uc-ai-image-editor> history', () => {
 
     const el = mount(STAGING);
     el.sourceFileInfo = { uuid: SAMPLE_UUID } as UploadcareFile;
-    await el.updateComplete;
-    await vi.waitFor(() => expect(editorMode(el)).toBe('edit'));
+    await expect.element(editorRegion('edit')).toBeVisible();
 
     // The canvas (and shimmer) resume on the latest result, not the original.
-    await vi.waitFor(() => expect(canvasUrl(el)).toContain(LATEST));
-    expect(canvasUrl(el)).not.toContain(SAMPLE_UUID);
-  });
-
-  it('does not render Start over in edit mode opened with a source (uploader AI-edit)', async () => {
-    const el = mount(STAGING);
-    el.sourceUuid = SAMPLE_UUID;
-    await el.updateComplete;
-    await vi.waitFor(() => expect(editorMode(el)).toBe('edit'));
-    await el.updateComplete;
-
-    // Editing an existing image has nothing to "start over" to — the affordance
-    // is absent (and, with no generation history yet, the strip isn't mounted).
-    const history = historyEl(el);
-    const startOver = history?.shadowRoot?.querySelector('.startover__btn') ?? null;
-    expect(startOver).toBeNull();
-  });
-
-  it.skip('returns to generate mode after Start over (from the history strip)', async () => {
-    stubFetch({ uuid: 'result' });
-    const el = mount(STAGING);
-    await el.updateComplete;
-    typePrompt(el, 'a tiger');
-    await el.updateComplete;
-    clickSend(el);
-    await vi.waitFor(() => expect(editorMode(el)).toBe('edit'));
-    await el.updateComplete;
-
-    const history = historyEl(el)!;
-    const startOver = history.shadowRoot!.querySelector('.startover__btn') as HTMLButtonElement;
-    startOver.click();
-    await el.updateComplete;
-    expect(editorMode(el)).toBe('generate');
-    expect(canvasUrl(el)).toBeNull();
-    // Start over also clears the prompt history (the strip unmounts).
-    await vi.waitFor(() => expect(historyEl(el)).toBeNull());
+    await expectCanvasToShow(LATEST);
+    await expect.element(canvasImage()).not.toHaveAttribute('src', expect.stringContaining(SAMPLE_UUID));
   });
 });
diff --git a/packages/ai-image-editor/tests/editor/layout.e2e.test.tsx b/packages/ai-image-editor/tests/editor/layout.e2e.test.tsx
index a605d01..75d1e30 100644
--- a/packages/ai-image-editor/tests/editor/layout.e2e.test.tsx
+++ b/packages/ai-image-editor/tests/editor/layout.e2e.test.tsx
@@ -1,210 +1,204 @@
-import { describe, expect, it, vi } from 'vitest';
-import { canvasUrl, clickSend, editorMode, mount, SAMPLE_UUID, STAGING, stubFetch, typePrompt } from './harness';
+import { describe, expect, it } from 'vitest';
+import { type Locator, page, userEvent } from 'vitest/browser';
+import type { UcAiImageEditorType } from './harness';
+import {
+  doneButton,
+  editorRegion,
+  expectCanvasToShow,
+  mount,
+  promptBox,
+  SAMPLE_UUID,
+  STAGING,
+  sendPrompt,
+} from './harness';
+
+const historyStrip = () => page.getByRole('toolbar', { name: 'Recent prompts' });
+
+const rectOf = (locator: Locator) => locator.element().getBoundingClientRect();
+
+/** The canvas fills the stage, so its box is the image area the composer and history float over or dock beside. */
+const canvasRect = (el: UcAiImageEditorType) => el.shadowRoot!.querySelector('uc-ai-canvas')!.getBoundingClientRect();
+
+/** Where `target` sits against the canvas: wholly above or below it, or over its top or bottom half. */
+function sideOfCanvas(el: UcAiImageEditorType, target: Locator): 'above' | 'below' | 'over-top' | 'over-bottom' {
+  const box = rectOf(target);
+  const canvas = canvasRect(el);
+  if (box.bottom <= canvas.top + 1) return 'above';
+  if (box.top >= canvas.bottom - 1) return 'below';
+  return (box.top + box.bottom) / 2 < (canvas.top + canvas.bottom) / 2 ? 'over-top' : 'over-bottom';
+}
+
+/** Where `target` sits against the prompt box: wholly above or below it, or overlapping it. */
+function sideOfPrompt(target: Locator): 'above' | 'below' | 'overlapping' {
+  const box = rectOf(target);
+  const prompt = rectOf(promptBox());
+  if (box.bottom <= prompt.top) return 'above';
+  if (box.top >= prompt.bottom) return 'below';
+  return 'overlapping';
+}
+
+/** Runs one generation so the history strip mounts. */
+async function generateOnce(): Promise<void> {
+  await sendPrompt('a tiger');
+  await expect.element(editorRegion('edit')).toBeVisible();
+  await expect.element(historyStrip()).toBeVisible();
+}
+
+/** Parks the pointer in the canvas's top-left corner, away from the composer and the bottom edge. */
+const parkPointer = (el: UcAiImageEditorType) =>
+  userEvent.hover(page.elementLocator(el.shadowRoot!.querySelector('uc-ai-canvas')!), {
+    position: { x: 2, y: 2 },
+    force: true,
+  });
+
+/** How far the prompt box's top sits below the canvas's bottom edge: about 20px docked and shown, about 110px hidden. */
+const promptDrop = (el: UcAiImageEditorType) => rectOf(promptBox()).top - canvasRect(el).bottom;
+
+/**
+ * Waits for the editor's CSS transitions to finish: two frames for a style change to start its transition, then every
+ * running animation in the editor's shadow root. A negative layout check made before then could pass on the old frame.
+ */
+async function transitionsDone(el: UcAiImageEditorType): Promise<void> {
+  await new Promise(requestAnimationFrame);
+  await new Promise(requestAnimationFrame);
+  await Promise.all(el.shadowRoot!.getAnimations().map((animation) => animation.finished));
+}
 
 /**
  * Where the composer, history strip and toolbar sit for a given placement, and
- * how auto-hide docking changes that.
+ * how auto-hide docking changes that, measured on the rendered boxes.
  */
 describe('<uc-ai-image-editor> layout', () => {
-  it('places the composer per composer-placement + canvas-fit', async () => {
-    const el = mount(STAGING);
-    el.canvasFit = 'full';
-    el.composerPlacement = 'bottom';
-    await el.updateComplete;
-    const shell = el.shadowRoot!.querySelector('.shell')!;
-    const stage = () => shell.querySelector('.stage')!;
-    const composer = () => shell.querySelector('.composer')!;
-
-    // canvas-fit full → composer floats over the full canvas (inside the stage).
-    expect(composer().classList.contains('composer--overlay-bottom')).toBe(true);
-    expect(stage().contains(composer())).toBe(true);
-
-    el.composerPlacement = 'top';
-    await el.updateComplete;
-    expect(composer().classList.contains('composer--overlay-top')).toBe(true);
-    expect(stage().contains(composer())).toBe(true);
-
-    // canvas-fit available → composer docked outside the stage so the canvas
-    // shrinks. `top` sits before the stage…
-    el.canvasFit = 'available';
-    el.composerPlacement = 'top';
-    await el.updateComplete;
-    expect(composer().classList.contains('composer--docked')).toBe(true);
-    expect(stage().contains(composer())).toBe(false);
-    let kids = [...shell.children];
-    expect(kids.indexOf(composer())).toBeLessThan(kids.indexOf(stage()));
-
-    // …`bottom` after it.
-    el.composerPlacement = 'bottom';
-    await el.updateComplete;
-    kids = [...shell.children];
-    expect(kids.indexOf(composer())).toBeGreaterThan(kids.indexOf(stage()));
-  });
-
-  it('defaults to a docked composer at the bottom', async () => {
+  // canvas-fit full floats the composer over the canvas; available docks it outside, so the canvas shrinks.
+  it.each([
+    ['full', 'bottom', 'over-bottom'],
+    ['full', 'top', 'over-top'],
+    ['available', 'top', 'above'],
+    ['available', 'bottom', 'below'],
+  ] as const)(
+    'with canvas-fit %s and composer-placement %s, puts the composer %s the canvas',
+    async (fit, placement, side) => {
+      const el = mount(STAGING);
+      el.canvasFit = fit;
+      el.composerPlacement = placement;
+      await expect.poll(() => sideOfCanvas(el, promptBox())).toBe(side);
+    },
+  );
+
+  it('defaults to a docked composer and a toolbar, both below the canvas', async () => {
     const el = mount(STAGING);
-    await el.updateComplete;
-    const composer = el.shadowRoot!.querySelector('.composer')!;
     expect(el.composerPlacement).toBe('bottom');
     expect(el.canvasFit).toBe('available');
-    expect(composer.classList.contains('composer--docked-bottom')).toBe(true);
+    await expect.poll(() => sideOfCanvas(el, promptBox())).toBe('below');
+    await expect.poll(() => sideOfCanvas(el, doneButton())).toBe('below');
   });
 
-  it('places the toolbar per toolbar-placement', async () => {
+  // An unknown value falls back to the default (bottom), like the other placement enums.
+  it.each([
+    ['bottom', 'below'],
+    ['top', 'above'],
+    ['junk', 'below'],
+  ] as const)('with toolbar-placement %s, puts the toolbar %s the canvas', async (placement, side) => {
     const el = mount(STAGING);
-    await el.updateComplete;
-    const shell = el.shadowRoot!.querySelector('.shell')!;
-    const footer = () => shell.querySelector('uc-ai-footer')!;
-    const stage = () => shell.querySelector('.stage')!;
-
-    // Default: toolbar at the bottom (after the stage).
-    let kids = [...shell.children];
-    expect(kids.indexOf(footer())).toBeGreaterThan(kids.indexOf(stage()));
-
-    // Top: toolbar before the stage.
-    el.toolbarPlacement = 'top';
-    await el.updateComplete;
-    kids = [...shell.children];
-    expect(kids.indexOf(footer())).toBeLessThan(kids.indexOf(stage()));
-
-    // None: no toolbar at all; the stage still renders.
-    el.toolbarPlacement = 'none';
-    await el.updateComplete;
-    expect(shell.querySelector('uc-ai-footer')).toBeNull();
-    expect(stage()).not.toBeNull();
-
-    // An unknown value falls back to the default (bottom), like the other
-    // placement enums.
-    el.toolbarPlacement = 'junk' as never;
-    await el.updateComplete;
-    kids = [...shell.children];
-    expect(kids.indexOf(footer())).toBeGreaterThan(kids.indexOf(stage()));
+    el.toolbarPlacement = placement as UcAiImageEditorType['toolbarPlacement'];
+    await expect.poll(() => sideOfCanvas(el, doneButton())).toBe(side);
   });
 
-  it('places the history strip per history-placement (overlay composer)', async () => {
-    stubFetch({ uuid: 'r' });
+  it('renders no toolbar with toolbar-placement none, and still renders the canvas', async () => {
     const el = mount(STAGING);
-    el.canvasFit = 'full'; // relative history rides an overlay composer
-    await el.updateComplete;
-    typePrompt(el, 'a tiger');
-    await el.updateComplete;
-    clickSend(el);
-    await vi.waitFor(() => expect(editorMode(el)).toBe('edit')); // a result mounts the strip
-    await el.updateComplete;
-
-    const shell = el.shadowRoot!.querySelector('.shell')!;
-    const history = () => shell.querySelector('uc-ai-history')!;
-    const composer = () => shell.querySelector('.composer')!;
-    const stage = () => shell.querySelector('.stage')!;
-    const promptRow = () => composer().querySelector('uc-ai-prompt-row')!;
-    const content = () => composer().querySelector('.composer__content')!;
-
-    // composer-above (default): inside the composer, before the prompt row.
-    expect(composer().contains(history())).toBe(true);
-    let kids = [...content().children];
-    expect(kids.indexOf(history())).toBeLessThan(kids.indexOf(promptRow()));
-
-    // composer-below: inside the composer, after the prompt row.
-    el.historyPlacement = 'composer-below';
-    await el.updateComplete;
-    kids = [...content().children];
-    expect(kids.indexOf(history())).toBeGreaterThan(kids.indexOf(promptRow()));
-
-    // canvas-top: pinned in the stage, not inside the composer.
-    el.historyPlacement = 'canvas-top';
-    await el.updateComplete;
-    expect(composer().contains(history())).toBe(false);
-    const pinned = stage().querySelector('.history-pinned')!;
-    expect(pinned.classList.contains('history-pinned--canvas-top')).toBe(true);
-    expect(pinned.contains(history())).toBe(true);
+    el.toolbarPlacement = 'none';
+    await expect.element(doneButton()).not.toBeInTheDocument();
+    expect(canvasRect(el).height).toBeGreaterThan(0);
   });
 
+  // An overlay composer (canvas-fit full), which relative history placements ride.
+  it.each([
+    ['composer-above', 'over-bottom', 'above'],
+    ['composer-below', 'over-bottom', 'below'],
+    ['canvas-top', 'over-top', 'above'],
+  ] as const)(
+    'with history-placement %s, puts the history strip %s the canvas and %s the prompt',
+    async (placement, canvasSide, promptSide) => {
+      const el = mount(STAGING);
+      el.canvasFit = 'full';
+      el.historyPlacement = placement;
+      await generateOnce();
+      await expect.poll(() => sideOfCanvas(el, historyStrip())).toBe(canvasSide);
+      await expect.poll(() => sideOfPrompt(historyStrip())).toBe(promptSide);
+    },
+  );
+
   it('pins the history over the canvas when the composer is docked-out', async () => {
-    stubFetch({ uuid: 'r' });
     const el = mount(STAGING); // docked at the bottom by default
-    await el.updateComplete;
-    typePrompt(el, 'a tiger');
-    await el.updateComplete;
-    clickSend(el);
-    await vi.waitFor(() => expect(editorMode(el)).toBe('edit'));
-    await el.updateComplete;
-
-    const shell = el.shadowRoot!.querySelector('.shell')!;
-    const stage = shell.querySelector('.stage')!;
-    const composer = shell.querySelector('.composer')!;
-    const history = shell.querySelector('uc-ai-history')!;
-
-    // The composer (prompt) is docked outside the canvas; the history chips
-    // float over the canvas (pinned), not inside the docked composer.
-    expect(stage.contains(composer)).toBe(false);
-    expect(composer.contains(history)).toBe(false);
-    const pinned = stage.querySelector('.history-pinned')!;
-    expect(pinned.contains(history)).toBe(true);
-    expect(pinned.classList.contains('history-pinned--canvas-bottom')).toBe(true);
+    await generateOnce();
+
+    // The composer (prompt) is docked below the canvas; the history chips
+    // float over the canvas's bottom edge, not inside the docked composer.
+    await expect.poll(() => sideOfCanvas(el, promptBox())).toBe('below');
+    await expect.poll(() => sideOfCanvas(el, historyStrip())).toBe('over-bottom');
   });
 
-  it('docks the overlay composer (renders the dock-hotzone) when composer-auto-hide is on', async () => {
+  it('slides an overlay composer off the canvas under composer-auto-hide and raises it at the edge', async () => {
     const el = mount(STAGING);
     el.canvasFit = 'full'; // an overlay (floating) composer
     el.composerAutoHide = true;
     el.sourceUuid = SAMPLE_UUID; // edit mode + an image to dock against
-    await el.updateComplete;
-    await vi.waitFor(() => expect(canvasUrl(el)).toBeTruthy());
-    await el.updateComplete;
+    await expectCanvasToShow(SAMPLE_UUID);
 
     // The CSS docking keys off this reflected host attribute.
-    expect(el.hasAttribute('composer-auto-hide')).toBe(true);
-
-    // A pointer catch-strip is rendered on the composer's edge (bottom by default).
-    const hotzone = el.shadowRoot!.querySelector('.dock-hotzone');
-    expect(hotzone).toBeTruthy();
-    expect(hotzone!.classList.contains('dock-hotzone--bottom')).toBe(true);
+    await expect.element(el).toHaveAttribute('composer-auto-hide');
+
+    // Docked: the prompt slides past the canvas's bottom edge, leaving a peek.
+    await parkPointer(el);
+    await expect.poll(() => -promptDrop(el)).toBeLessThan(40);
+
+    // The pointer nearing the bottom edge (beside the composer, not on it) raises it wholly back over the canvas.
+    const canvas = canvasRect(el);
+    await userEvent.hover(page.elementLocator(el.shadowRoot!.querySelector('uc-ai-canvas')!), {
+      position: { x: 2, y: canvas.height - 10 },
+      force: true,
+    });
+    await expect.poll(() => rectOf(promptBox()).bottom - canvasRect(el).bottom).toBeLessThan(0);
   });
 
-  it('does not dock (no hotzone) when auto-hide is disabled', async () => {
+  it('does not dock when auto-hide is disabled', async () => {
     const el = mount(STAGING);
     el.sourceUuid = SAMPLE_UUID;
-    await el.updateComplete;
-    await vi.waitFor(() => expect(canvasUrl(el)).toBeTruthy());
+    await expectCanvasToShow(SAMPLE_UUID);
+    await parkPointer(el);
+
+    // Disabled (default): the docked prompt stays shown right below the canvas…
+    await expect.element(el).not.toHaveAttribute('composer-auto-hide');
+    await transitionsDone(el);
+    expect(sideOfCanvas(el, promptBox())).toBe('below');
+    expect(promptDrop(el)).toBeLessThan(40);
 
-    // Disabled (default): no dock-hotzone, no reserved space.
-    expect(el.shadowRoot!.querySelector('.dock-hotzone')).toBeNull();
-    expect(el.hasAttribute('composer-auto-hide')).toBe(false);
+    // …and an overlay one stays wholly over it.
+    el.canvasFit = 'full';
+    await expect.poll(() => sideOfCanvas(el, promptBox())).toBe('over-bottom');
+    await transitionsDone(el);
+    expect(rectOf(promptBox()).bottom - canvasRect(el).bottom).toBeLessThan(0);
   });
 
-  it('keeps a docked composer docked under auto-hide (no overlay, no hotzone), independent of canvas-fit', async () => {
+  it('keeps a docked composer docked under auto-hide, independent of canvas-fit', async () => {
     const el = mount(STAGING);
     el.sourceUuid = SAMPLE_UUID;
     el.composerAutoHide = true;
     el.composerPlacement = 'bottom';
     el.canvasFit = 'available';
-    await el.updateComplete;
-    await vi.waitFor(() => expect(canvasUrl(el)).toBeTruthy());
-    await el.updateComplete;
+    await expectCanvasToShow(SAMPLE_UUID);
+    await parkPointer(el);
 
     // Auto-hide is orthogonal to canvas-fit: it does NOT force `full`. A docked
-    // composer stays docked and hides by collapsing in place (so no overlay
-    // positioning and no dock-hotzone — that chrome is overlay-only).
+    // composer stays below the canvas and hides by collapsing in place: the
+    // prompt slides down inside its reserved slot instead of over the canvas…
     expect(el.canvasFit).toBe('available');
-    const composer = el.shadowRoot!.querySelector('.composer')!;
-    expect(composer.classList.contains('composer--docked')).toBe(true);
-    expect(composer.classList.contains('composer--overlay')).toBe(false);
-    expect(el.shadowRoot!.querySelector('.dock-hotzone')).toBeNull();
-  });
+    await expect.poll(() => promptDrop(el)).toBeGreaterThan(60);
+    const canvasHeight = canvasRect(el).height;
 
-  it('docks an overlay composer with a hotzone when auto-hide is on', async () => {
-    const el = mount(STAGING);
-    el.sourceUuid = SAMPLE_UUID;
-    el.composerAutoHide = true;
-    el.canvasFit = 'full'; // floating composer
-    await el.updateComplete;
-    await vi.waitFor(() => expect(canvasUrl(el)).toBeTruthy());
-    await el.updateComplete;
-
-    const composer = el.shadowRoot!.querySelector('.composer')!;
-    expect(composer.classList.contains('composer--overlay')).toBe(true);
-    const hotzone = el.shadowRoot!.querySelector('.dock-hotzone');
-    expect(hotzone).toBeTruthy();
-    expect(hotzone!.classList.contains('dock-hotzone--bottom')).toBe(true);
+    // …and hovering it raises it in the same slot, so the canvas keeps its size.
+    await userEvent.hover(promptBox(), { force: true });
+    await expect.poll(() => promptDrop(el)).toBeLessThan(40);
+    expect(canvasRect(el).height).toBe(canvasHeight);
   });
 });
diff --git a/packages/ai-image-editor/tests/editor/mounting.e2e.test.tsx b/packages/ai-image-editor/tests/editor/mounting.e2e.test.tsx
index fb1d4bd..f99c88e 100644
--- a/packages/ai-image-editor/tests/editor/mounting.e2e.test.tsx
+++ b/packages/ai-image-editor/tests/editor/mounting.e2e.test.tsx
@@ -1,6 +1,13 @@
-import { describe, expect, it, vi } from 'vitest';
-import { MODES } from '../../src/internal';
-import { editorMode, mount, SAMPLE_UUID, STAGING, UcAiImageEditor } from './harness';
+import { describe, expect, it } from 'vitest';
+import { page } from 'vitest/browser';
+import { doneButton, editorRegion, mount, promptBox, SAMPLE_UUID, STAGING, UcAiImageEditor } from './harness';
+
+/** The quick-prompt chips, by their labels. */
+const quickPrompts = () => page.getByRole('toolbar', { name: 'Quick prompts' }).getByRole('button');
+const quickPromptLabels = () =>
+  quickPrompts()
+    .elements()
+    .map((chip) => chip.textContent!.trim());
 
 /**
  * What the element renders when it mounts, and the configuration that decides
@@ -11,36 +18,23 @@ describe('<uc-ai-image-editor> mounting and configuration', () => {
     expect(customElements.get('uc-ai-image-editor')).toBe(UcAiImageEditor);
   });
 
-  it('mounts in generate mode and renders the canvas + prompt + chips + footer (no history strip yet)', async () => {
-    const el = mount();
-    await el.updateComplete;
-    const root = el.shadowRoot;
-    expect(root?.querySelector('uc-ai-canvas')).toBeTruthy();
-    expect(root?.querySelector('uc-ai-prompt-row')).toBeTruthy();
-    expect(root?.querySelector('uc-ai-chips')).toBeTruthy();
-    expect(root?.querySelector('uc-ai-footer')).toBeTruthy();
+  it('mounts in generate mode with the prompt, quick prompts and footer (no history strip yet)', async () => {
+    mount();
+    await expect.element(editorRegion('generate')).toBeVisible();
+    await expect.element(promptBox()).toHaveAccessibleName('Create image...');
+    await expect.element(page.getByRole('toolbar', { name: 'Quick prompts' })).toBeVisible();
+    await expect.element(page.getByRole('button', { name: 'Cancel', exact: true })).toBeVisible();
+    await expect.element(doneButton()).toBeVisible();
     // The history strip only mounts once there are results (or in edit mode).
-    expect(root?.querySelector('uc-ai-history')).toBeNull();
-    expect(editorMode(el)).toBe('generate');
+    await expect.element(page.getByRole('toolbar', { name: 'Recent prompts' })).not.toBeInTheDocument();
   });
 
   it('derives edit mode from a source uuid, generate mode without one', async () => {
     const el = mount();
-    await el.updateComplete;
-    expect(editorMode(el)).toBe('generate');
+    await expect.element(editorRegion('generate')).toBeVisible();
     el.sourceUuid = SAMPLE_UUID;
-    await el.updateComplete;
-    expect(editorMode(el)).toBe('edit');
-  });
-
-  it('updates internal prompt state when the user types in the prompt input', async () => {
-    const el = mount();
-    await el.updateComplete;
-    const input = el.shadowRoot!.querySelector('uc-ai-prompt-row')!.shadowRoot!.querySelector('textarea')!;
-    input.value = 'a tiger';
-    input.dispatchEvent(new Event('input', { bubbles: true }));
-    await el.updateComplete;
-    expect(input.value).toBe('a tiger');
+    await expect.element(editorRegion('edit')).toBeVisible();
+    await expect.element(promptBox()).toHaveAccessibleName('Edit image...');
   });
 
   it('renders configurable prompt presets per mode', async () => {
@@ -52,52 +46,39 @@ describe('<uc-ai-image-editor> mounting and configuration', () => {
       ],
       edit: [{ label: 'Enhance', prompt: 'Enhance it' }],
     };
-    await el.updateComplete;
-
-    const chipLabels = async (): Promise<string[]> => {
-      const chips = el.shadowRoot!.querySelector('uc-ai-chips') as unknown as {
-        updateComplete: Promise<unknown>;
-        shadowRoot: ShadowRoot;
-      } | null;
-      await chips?.updateComplete;
-      return [...(chips?.shadowRoot.querySelectorAll('.chip') ?? [])].map((c) => c.textContent!.trim());
-    };
 
     // generate mode uses presets.generate…
-    expect(await chipLabels()).toEqual(['Logo', 'Sticker']);
+    await expect.poll(quickPromptLabels).toEqual(['Logo', 'Sticker']);
 
     // …and edit mode uses presets.edit.
     el.sourceUuid = SAMPLE_UUID;
-    await el.updateComplete;
-    expect(await chipLabels()).toEqual(['Enhance']);
+    await expect.poll(quickPromptLabels).toEqual(['Enhance']);
   });
 
   it('falls back to built-in presets for modes left out of the presets map', async () => {
     const el = mount();
     el.presets = { edit: [{ label: 'Enhance', prompt: 'Enhance it' }] }; // generate omitted
-    await el.updateComplete;
-    const chips = el.shadowRoot!.querySelector('uc-ai-chips') as unknown as { shadowRoot: ShadowRoot };
-    expect(chips.shadowRoot.querySelectorAll('.chip').length).toBe(MODES.generate.presets.length);
+    await expect
+      .poll(quickPromptLabels)
+      .toEqual(['Portrait', 'Cinematic', 'Product', 'Landscape', 'Illustration', '3D character']);
   });
 
   it('hides the chips toolbar when a mode preset set is empty', async () => {
     const el = mount();
+    await expect.element(page.getByRole('toolbar', { name: 'Quick prompts' })).toBeVisible();
     el.presets = { generate: [] };
-    await el.updateComplete;
-    expect(el.shadowRoot!.querySelector('uc-ai-chips')).toBeNull();
+    await expect.element(page.getByRole('toolbar', { name: 'Quick prompts' })).not.toBeInTheDocument();
   });
 
   it('resolves locale strings from localeName + locale-keyed localeDefinitionOverride', async () => {
     const el = mount(STAGING);
-    const cancelLabel = () => el.shadowRoot!.querySelector('uc-ai-footer')!.getAttribute('cancel-label');
 
     // Override is keyed by locale name (same shape as the uploader's config).
     el.localeDefinitionOverride = { en: { 'ai-image-editor-cancel': 'Dismiss' } };
-    await el.updateComplete;
-    await vi.waitFor(() => expect(cancelLabel()).toBe('Dismiss'));
+    await expect.element(page.getByRole('button', { name: 'Dismiss', exact: true })).toBeVisible();
 
     // Switching the active locale lazy-loads that locale's built-in strings.
     el.localeName = 'de';
-    await vi.waitFor(() => expect(cancelLabel()).toBe('Abbrechen'));
+    await expect.element(page.getByRole('button', { name: 'Abbrechen', exact: true })).toBeVisible();
   });
 });
diff --git a/packages/ai-image-editor/tests/editor/sizing.e2e.test.tsx b/packages/ai-image-editor/tests/editor/sizing.e2e.test.tsx
index 7b21ec1..1ebe0c6 100644
--- a/packages/ai-image-editor/tests/editor/sizing.e2e.test.tsx
+++ b/packages/ai-image-editor/tests/editor/sizing.e2e.test.tsx
@@ -1,35 +1,47 @@
 import { describe, expect, it, vi } from 'vitest';
-import { delay } from '../test-renderer';
 import type { UcAiImageEditorType } from './harness';
-import { canvasUrl, clickSend, mount, SAMPLE_UUID, STAGING, stubFetch, typePrompt } from './harness';
+import { canvasImage, editorRegion, mount, STAGING, sendPrompt } from './harness';
+
+/**
+ * Resolves once a ResizeObserver created now has reported `target`'s current size. Observers are notified in creation
+ * order, so every older one (the host's own) has already handled that layout.
+ */
+const afterResizeObservers = (target: Element) =>
+  new Promise<void>((resolve) => {
+    const observer = new ResizeObserver(() => {
+      observer.disconnect();
+      resolve();
+    });
+    observer.observe(target);
+  });
 
 /** How the host sizes itself: fill vs content, the clamp, and the CDN rendition it picks. */
 describe('<uc-ai-image-editor> sizing', () => {
-  const stageEl = (el: UcAiImageEditorType) => el.shadowRoot!.querySelector('.stage') as HTMLElement;
+  /** The canvas fills the stage, so its box is the stage's. */
+  const canvasEl = (el: UcAiImageEditorType) =>
+    el.shadowRoot!.querySelector('uc-ai-canvas') as HTMLElement & {
+      updateComplete: Promise<boolean>;
+    };
 
   it('defaults to fill and reflects the property to the attribute', async () => {
     const el = mount(STAGING);
-    await el.updateComplete;
     expect(el.sizing).toBe('fill');
     el.sizing = 'content';
-    await el.updateComplete;
-    expect(el.getAttribute('sizing')).toBe('content');
+    await expect.element(el).toHaveAttribute('sizing', 'content');
   });
 
   it('keeps an unsized fill host from collapsing (min-height fallback)', async () => {
     const el = mount(STAGING);
-    await el.updateComplete;
-    expect(getComputedStyle(el).minHeight).toBe('480px');
+    await expect.element(el).toHaveStyle({ minHeight: '480px' });
 
     // The mode is CSS-driven, so an unknown value behaves as fill too.
     el.sizing = 'junk' as never;
-    await el.updateComplete;
-    expect(getComputedStyle(el).minHeight).toBe('480px');
+    await expect.element(el).toHaveAttribute('sizing', 'junk');
+    expect(el).toHaveStyle({ minHeight: '480px' });
 
     // Content mode derives its own height instead of guarding a given one.
     el.sizing = 'content';
-    await el.updateComplete;
-    expect(getComputedStyle(el).minHeight).not.toBe('480px');
+    await expect.element(el).not.toHaveStyle({ minHeight: '480px' });
 
     // Plain consumer CSS always beats the :host fallback (shadow-cascade
     // rule: outer-tree declarations win over :host, specificity aside).
@@ -38,8 +50,7 @@ describe('<uc-ai-image-editor> sizing', () => {
     consumerCss.textContent = 'uc-ai-image-editor { min-height: 100px; }';
     document.head.append(consumerCss);
     try {
-      await el.updateComplete;
-      expect(getComputedStyle(el).minHeight).toBe('100px');
+      await expect.element(el).toHaveStyle({ minHeight: '100px' });
     } finally {
       consumerCss.remove();
     }
@@ -47,20 +58,18 @@ describe('<uc-ai-image-editor> sizing', () => {
 
   it('derives its height from the selected ratio at the given width in content mode', async () => {
     const el = mount({ ...STAGING, sizing: 'content', 'aspect-ratios': '1:1', style: 'width: 640px' });
-    await el.updateComplete;
 
     // The stage expresses the frame fit exactly: (640 - 40) / 1 + 40 = 640.
-    await vi.waitFor(() => expect(stageEl(el).getBoundingClientRect().height).toBeCloseTo(640, 0));
+    await expect.poll(() => canvasEl(el).getBoundingClientRect().height).toBeCloseTo(640, 0);
 
     // The host wraps its content — stage plus composer/toolbar chrome.
-    const shell = el.shadowRoot!.querySelector('.shell') as HTMLElement;
+    const shell = editorRegion('generate').element();
     expect(shell.getBoundingClientRect().height).toBeGreaterThan(640);
     expect(el.getBoundingClientRect().height).toBeCloseTo(shell.getBoundingClientRect().height, 0);
 
     // Picking a different ratio re-derives it: (640 - 40) / 2 + 40 = 340.
     el.setAttribute('aspect-ratios', '2:1');
-    await el.updateComplete;
-    await vi.waitFor(() => expect(stageEl(el).getBoundingClientRect().height).toBeCloseTo(340, 0));
+    await expect.poll(() => canvasEl(el).getBoundingClientRect().height).toBeCloseTo(340, 0);
   });
 
   it('clamps to the consumer max-height and letterboxes the canvas', async () => {
@@ -71,15 +80,13 @@ describe('<uc-ai-image-editor> sizing', () => {
       'aspect-ratios': '1:2',
       style: 'width: 640px; max-height: 600px',
     });
-    await el.updateComplete;
 
-    await vi.waitFor(() => expect(el.getBoundingClientRect().height).toBeCloseTo(600, 0));
-    expect(stageEl(el).getBoundingClientRect().height).toBeLessThan(600);
+    await expect.poll(() => el.getBoundingClientRect().height).toBeCloseTo(600, 0);
+    expect(canvasEl(el).getBoundingClientRect().height).toBeLessThan(600);
 
     // The frame letterboxes inside the clamped stage: it keeps the 1:2
     // ratio instead of stretching to the full width.
-    const canvas = el.shadowRoot!.querySelector('uc-ai-canvas')!;
-    const frame = canvas.shadowRoot!.querySelector('.canvas__frame') as HTMLElement;
+    const frame = canvasEl(el).shadowRoot!.querySelector('.canvas__frame') as HTMLElement;
     await vi.waitFor(() => {
       const rect = frame.getBoundingClientRect();
       expect(rect.height).toBeGreaterThan(0);
@@ -89,26 +96,32 @@ describe('<uc-ai-image-editor> sizing', () => {
   });
 
   it('re-picks a sharper CDN preview when the host grows, keeping it when it shrinks', async () => {
-    stubFetch({ uuid: SAMPLE_UUID });
     const el = mount({ ...STAGING, style: 'width: 500px; height: 480px' });
-    await el.updateComplete;
-    typePrompt(el, 'a tiger');
-    await el.updateComplete;
-    clickSend(el);
+    await sendPrompt('a tiger');
 
     const dpr = Math.max(window.devicePixelRatio, 1);
-    const size = (bucket: number) => Math.min(Math.ceil(bucket * dpr), 3000);
+    const rendition = (bucket: number) =>
+      expect.stringContaining(
+        `/preview/${Math.min(Math.ceil(bucket * dpr), 3000)}x${Math.min(Math.ceil(bucket * dpr), 3000)}/`,
+      );
+    /** Every image the canvas renders: the one shown, plus a preload of the next rendition or the one fading out. */
+    const canvasImageSources = () =>
+      [...canvasEl(el).shadowRoot!.querySelectorAll('img')].map((img) => img.getAttribute('src'));
 
     // A 500px-wide host lands in the 600px rendition bucket.
-    await vi.waitFor(() => expect(canvasUrl(el)).toContain(`/preview/${size(600)}x${size(600)}/`));
+    await expect.element(canvasImage()).toHaveAttribute('src', rendition(600));
 
     // Growing past the bucket steps the rendition up…
     el.style.width = '900px';
-    await vi.waitFor(() => expect(canvasUrl(el)).toContain(`/preview/${size(1000)}x${size(1000)}/`));
+    await expect.element(canvasImage()).toHaveAttribute('src', rendition(1000));
+    // (once the 600px one has faded out, so the canvas renders that image alone)
+    await expect.poll(canvasImageSources).toEqual([expect.stringContaining('/preview/')]);
 
-    // …while shrinking keeps the sharper, already-cached one.
+    // …while shrinking keeps the sharper, already-cached one: no preload of a smaller rendition starts.
     el.style.width = '300px';
-    await delay(120);
-    expect(canvasUrl(el)).toContain(`/preview/${size(1000)}x${size(1000)}/`);
+    await afterResizeObservers(el);
+    await el.updateComplete;
+    await canvasEl(el).updateComplete;
+    expect(canvasImageSources()).toEqual([rendition(1000)]);
   });
 });
diff --git a/packages/ai-image-editor/tests/emulator.ts b/packages/ai-image-editor/tests/emulator.ts
new file mode 100644
index 0000000..62ea52c
--- /dev/null
+++ b/packages/ai-image-editor/tests/emulator.ts
@@ -0,0 +1,21 @@
+import type { EmulatorSession } from '@uploadcare/api-emulator';
+import { setupEmulator } from '@uploadcare/api-emulator/browser';
+import { beforeEach } from 'vitest';
+import { failOnSchemaDrift } from './schema-drift';
+
+/**
+ * The Uploadcare emulator, running in the page, for Uploadcare's hosts and `cdn.example.com` (the CDN cname the
+ * editor tests configure). Every other origin except the page's own fails, so nothing reaches the real network. The
+ * uploader tests import an Unsplash image from a URL; the emulator's `from_url` answers for it without fetching it.
+ */
+const emulator = setupEmulator({ cdnHosts: ['cdn.example.com'], unhandled: 'error' });
+
+/** The current test's emulator session, for a test that registers a scenario or preset on it. */
+export let session: EmulatorSession;
+
+/** Every test starts against an empty session. */
+beforeEach(async () => {
+  session = await emulator.reset();
+});
+
+failOnSchemaDrift();
diff --git a/packages/ai-image-editor/tests/fixtures/production-status-success.ts b/packages/ai-image-editor/tests/fixtures/production-status-success.ts
new file mode 100644
index 0000000..c75a695
--- /dev/null
+++ b/packages/ai-image-editor/tests/fixtures/production-status-success.ts
@@ -0,0 +1,54 @@
+/**
+ * A `derivative/status/` success frame production sent, verbatim: no `type` on success, and for an image file
+ * `image_info` and `content_info.image` present, `video_info` null. The only frame of the derivative API recorded
+ * from the real API, so the one fixture the emulator's derivative routes can be held to.
+ */
+export const PRODUCTION_STATUS_SUCCESS = {
+  size: 1620930,
+  total: 1620930,
+  done: 1620930,
+  uuid: '2e0c4294-32e0-4999-aed1-e78221224339',
+  file_id: '2e0c4294-32e0-4999-aed1-e78221224339',
+  original_filename: 'generated.png',
+  is_image: true,
+  is_stored: false,
+  image_info: {
+    dpi: null,
+    width: 1248,
+    format: 'PNG',
+    height: 832,
+    sequence: false,
+    color_mode: 'RGB',
+    orientation: null,
+    geo_location: null,
+    datetime_original: null,
+  },
+  video_info: null,
+  content_info: {
+    mime: { mime: 'image/png', type: 'image', subtype: 'png' },
+    image: {
+      dpi: null,
+      width: 1248,
+      format: 'PNG',
+      height: 832,
+      sequence: false,
+      color_mode: 'RGB',
+      orientation: null,
+      geo_location: null,
+      datetime_original: null,
+    },
+  },
+  is_ready: true,
+  filename: 'generated.png',
+  mime_type: 'image/png',
+  metadata: {},
+  status: 'success',
+};
+
+/** `value` with every leaf replaced by its JSON type (`'null'` and `'array'` kept apart), so two frames compare by shape. */
+export const shapeOf = (value: unknown): unknown => {
+  if (value === null) return 'null';
+  if (Array.isArray(value)) return 'array';
+  if (typeof value !== 'object') return typeof value;
+  return Object.fromEntries(Object.entries(value).map(([key, inner]) => [key, shapeOf(inner)]));
+};
diff --git a/packages/ai-image-editor/tests/plugin.e2e.test.ts b/packages/ai-image-editor/tests/plugin.e2e.test.ts
index 10c16b9..79f6689 100644
--- a/packages/ai-image-editor/tests/plugin.e2e.test.ts
+++ b/packages/ai-image-editor/tests/plugin.e2e.test.ts
@@ -1,6 +1,8 @@
-import { beforeAll, describe, expect, it, vi } from 'vitest';
-import { page } from 'vitest/browser';
-import { cleanup, delay, getCtxName } from './test-renderer';
+import { beforeAll, beforeEach, describe, expect, it, vi } from 'vitest';
+import { page, userEvent } from 'vitest/browser';
+import type { UcAiImageEditor } from '../src/index';
+import { session } from './emulator';
+import { cleanup, getCtxName } from './test-renderer';
 
 const TEST_IMAGE_URL =
   'https://images.unsplash.com/photo-1699102241946-45c5e1937d69?ixlib=rb-4.0.3&q=85&fm=jpg&crop=entropy&cs=srgb&w=640';
@@ -13,6 +15,7 @@ type UploadCtxProvider = HTMLElement & {
     initFlow: () => void;
     removeAllFiles: () => void;
     getOutputCollectionState: () => { allEntries: OutputEntry[] };
+    l10n: (key: string) => string;
   };
 };
 
@@ -23,7 +26,7 @@ async function renderUploader(plugins: unknown[] = []) {
      <uc-config ctx-name="${ctxName}" pubkey="demopublickey" test-mode debug></uc-config>
      <uc-upload-ctx-provider ctx-name="${ctxName}"></uc-upload-ctx-provider>`,
   );
-  await delay(0);
+  await customElements.whenDefined('uc-config');
   const config = document.querySelector(`uc-config[ctx-name="${ctxName}"]`) as Config;
   config.plugins = plugins;
   return { ctxName, config };
@@ -38,6 +41,16 @@ function addSource(config: Config, sourceId: string) {
   config.sourceList += `,${sourceId}`;
 }
 
+/** Waits for the plugin's editor to open in `mode` (its region is named after the mode) and answers the element. */
+async function openedEditor(mode: 'generate' | 'edit'): Promise<UcAiImageEditor> {
+  const name = mode === 'edit' ? 'Edit image' : 'Generate image';
+  await expect.element(page.getByRole('region', { name, exact: true })).toBeVisible();
+  return document.querySelector('uc-ai-image-editor') as UcAiImageEditor;
+}
+
+/** The plugin's editor, for locators scoped to it (the uploader around it has its own Cancel). */
+const editorLocator = () => page.elementLocator(document.querySelector('uc-ai-image-editor')!);
+
 async function openModal() {
   await page.getByText('Upload files', { exact: true }).click();
 }
@@ -52,6 +65,23 @@ beforeAll(async () => {
   await import('../src/index');
 });
 
+/*
+ * The editor harness forces the dot grid's 2D path with `shimmerConfig = { useWebgl: false }`, but the plugin creates
+ * its own editor, and the canvas picks its backend before a test can reach it. Headless Chromium's WebGL is software
+ * (swiftshader): the generating shimmer's per-frame GL work starves the main thread, which is also where the emulator
+ * answers, so a single edit took ~5s instead of ~0.3s and, under a loaded suite, ran the test past its timeout. With no
+ * webgl2 context on offer the grid falls back to 2D, as it does in a browser without WebGL. Restored after each test.
+ */
+beforeEach(() => {
+  const getContext = HTMLCanvasElement.prototype.getContext;
+  vi.spyOn(HTMLCanvasElement.prototype, 'getContext').mockImplementation(function (
+    this: HTMLCanvasElement,
+    ...args: Parameters<HTMLCanvasElement['getContext']>
+  ) {
+    return args[0] === 'webgl2' ? null : getContext.apply(this, args);
+  } as HTMLCanvasElement['getContext']);
+});
+
 describe('AiImageEditorPlugin', () => {
   it('registers "Generate image" as an upload source', async () => {
     const { AiImageEditorPlugin } = await import('../src/plugin');
@@ -74,13 +104,7 @@ describe('AiImageEditorPlugin', () => {
     await openModal();
     await page.getByText('Generate image').click();
 
-    await vi.waitFor(() => {
-      expect(document.querySelector('uc-ai-image-editor')).toBeTruthy();
-    });
-    const editor = document.querySelector('uc-ai-image-editor') as Element & {
-      authToken?: unknown;
-      cacheAuthToken?: boolean;
-    };
+    const editor = await openedEditor('generate');
 
     expect(editor.cacheAuthToken).toBe(false);
     expect(typeof editor.authToken).toBe('function');
@@ -90,7 +114,7 @@ describe('AiImageEditorPlugin', () => {
     const resolve = editor.authToken as () => Promise<string>;
     await expect(resolve()).resolves.toBe('eyJ.uploader.sig');
     await expect(resolve()).resolves.toBe('eyJ.uploader.sig');
-    expect(fetchToken).toHaveBeenCalledTimes(1);
+    expect(fetchToken).toHaveBeenCalledOnce();
     cleanup();
   });
 
@@ -100,29 +124,14 @@ describe('AiImageEditorPlugin', () => {
     addSource(config, 'ai-image-editor');
     await openModal();
     await page.getByText('Generate image').click();
-    await vi.waitFor(() => {
-      const editor = document.querySelector('uc-ai-image-editor') as (Element & { sourceFileInfo?: unknown }) | null;
-      expect(editor).toBeTruthy();
-      // No source → derived generate mode (read off the prompt-row child).
-      const promptRow = editor?.shadowRoot?.querySelector('uc-ai-prompt-row') as (Element & { mode?: string }) | null;
-      expect(promptRow?.mode).toBe('generate');
-      expect(editor?.sourceFileInfo).toBeFalsy();
-    });
+    // No source → derived generate mode.
+    const editor = await openedEditor('generate');
+    expect(editor.sourceFileInfo).toBeUndefined();
     cleanup();
   });
 
-  // The editor renders the active locale's generate-button label as the prompt
-  // row's `send-aria-label`, and the cancel label as the footer's `cancel-label`.
-  const generateLabel = () =>
-    document
-      .querySelector('uc-ai-image-editor')
-      ?.shadowRoot?.querySelector('uc-ai-prompt-row')
-      ?.getAttribute('send-aria-label');
-  const cancelLabel = () =>
-    document
-      .querySelector('uc-ai-image-editor')
-      ?.shadowRoot?.querySelector('uc-ai-footer')
-      ?.getAttribute('cancel-label');
+  /** The editor's button named `name`. */
+  const editorButton = (name: string) => editorLocator().getByRole('button', { name, exact: true });
 
   it('feeds editor locale overrides from the uploader config (localeDefinitionOverride)', async () => {
     const { AiImageEditorPlugin } = await import('../src/plugin');
@@ -134,14 +143,16 @@ describe('AiImageEditorPlugin', () => {
     addSource(config, 'ai-image-editor');
     await openModal();
     await page.getByText('Generate image').click();
+    // The send button shows once the prompt holds text.
+    await userEvent.fill(editorLocator().getByRole('textbox'), 'a tiger');
 
-    await vi.waitFor(() => expect(generateLabel()).toBe('Make it!'));
+    await expect.element(editorButton('Make it!')).toBeVisible();
 
     // Reactive: changing the override after the editor is open updates it.
     (config as unknown as L10nConfig).localeDefinitionOverride = {
       en: { 'ai-image-editor-generate-btn': 'Generate now' },
     };
-    await vi.waitFor(() => expect(generateLabel()).toBe('Generate now'));
+    await expect.element(editorButton('Generate now')).toBeVisible();
     cleanup();
   });
 
@@ -153,11 +164,16 @@ describe('AiImageEditorPlugin', () => {
     await page.getByText('Generate image').click();
 
     // Defaults to English.
-    await vi.waitFor(() => expect(cancelLabel()).toBe('Cancel'));
+    await openedEditor('generate');
+    await expect.element(editorButton('Cancel')).toBeVisible();
 
     // Switching localeName lazy-loads and applies the German strings.
     (config as unknown as { localeName: string }).localeName = 'de';
-    await vi.waitFor(() => expect(cancelLabel()).toBe('Abbrechen'));
+    await expect.element(editorButton('Abbrechen')).toBeVisible();
+    // The editor loads its own strings; the uploader loads its locale separately
+    // and may still be resolving. Tearing it down mid-load is a file-uploader bug
+    // (fixed upstream, not yet released), so let the uploader finish switching too.
+    await vi.waitFor(() => expect(getApi().l10n('cancel')).toBe('Abbrechen'));
     cleanup();
   });
 
@@ -166,18 +182,14 @@ describe('AiImageEditorPlugin', () => {
     await renderUploader([AiImageEditorPlugin]);
     const api = getApi();
     api.addFileFromUrl(TEST_IMAGE_URL);
-    (api as unknown as { initFlow?: () => void }).initFlow?.();
+    api.initFlow();
 
     await expect.element(page.getByRole('button', { name: 'AI Edit' })).toBeVisible();
     await page.getByRole('button', { name: 'AI Edit' }).click();
 
-    await vi.waitFor(() => {
-      const editor = document.querySelector('uc-ai-image-editor') as (Element & { sourceFileInfo?: unknown }) | null;
-      expect(editor?.sourceFileInfo).toBeTruthy();
-      // A source file → derived edit mode (read off the prompt-row child).
-      const promptRow = editor?.shadowRoot?.querySelector('uc-ai-prompt-row') as (Element & { mode?: string }) | null;
-      expect(promptRow?.mode).toBe('edit');
-    });
+    // A source file → derived edit mode, on the uploaded file.
+    const editor = await openedEditor('edit');
+    expect(editor.sourceFileInfo).toMatchObject({ uuid: api.getOutputCollectionState().allEntries[0]!.uuid });
     cleanup();
   });
 
@@ -186,7 +198,7 @@ describe('AiImageEditorPlugin', () => {
     await renderUploader([AiImageEditorPlugin]);
     const api = getApi();
     api.addFileFromUrl(TEST_IMAGE_URL);
-    (api as unknown as { initFlow?: () => void }).initFlow?.();
+    api.initFlow();
 
     // Wait until the source file finished uploading (the AI Edit action only
     // renders once the entry has a uuid).
@@ -196,45 +208,34 @@ describe('AiImageEditorPlugin', () => {
     const originalUuid = before[0]!.uuid;
     const originalInternalId = before[0]!.internalId;
     const originalName = before[0]!.name;
-    expect(originalName).toBeTruthy();
+    expect(originalName).toMatch(/.+/);
 
     await page.getByRole('button', { name: 'AI Edit' }).click();
-    const editor = (await vi.waitFor(() => {
-      const el = document.querySelector('uc-ai-image-editor');
-      expect(el).toBeTruthy();
-      return el!;
-    })) as Element & { sourceFileInfo?: { uuid?: string; originalFilename?: string } };
+    const editor = await openedEditor('edit');
 
     // The plugin hands the source entry's file info to the editor (so it can
     // frame the canvas and name the result after the original) — verify it's the
     // source file's info that was wired through.
     expect(editor.sourceFileInfo?.uuid).toBe(originalUuid);
 
-    // The edit produced this already-uploaded result. Drive uc:done directly so
-    // the test doesn't depend on the generation backend.
-    const resultFile = {
-      uuid: 'edited-result',
-      cdnUrl: 'https://cdn.example.com/edited-result/',
-      originalFilename: originalName,
-      size: 4242,
-      isImage: true,
-      mimeType: 'image/png',
-      contentInfo: { mime: { mime: 'image/png' } },
-    };
-    editor.dispatchEvent(
-      new CustomEvent('uc:done', {
-        detail: { url: resultFile.cdnUrl, file: resultFile },
-        bubbles: true,
-        composed: true,
-      }),
-    );
+    // Run the edit against the emulator and commit its result.
+    session.use('derivativesInstant');
+    await userEvent.fill(editorLocator().getByRole('textbox'), 'add a hat');
+    await userEvent.click(editorButton('Generate'));
+    await expect.element(editorButton('Done')).toBeEnabled();
+    const onDone = vi.fn();
+    editor.addEventListener('uc:done', onDone);
+    await userEvent.click(editorButton('Done'));
+    expect(onDone).toHaveBeenCalledOnce();
+    const resultUuid: string = onDone.mock.calls[0]![0].detail.file.uuid;
+    expect(resultUuid).not.toBe(originalUuid);
+    expect(session.files.get(resultUuid)).toBeDefined();
 
     await vi.waitFor(() => {
       const after = api.getOutputCollectionState().allEntries;
       // Replaced in place: still a single entry, now carrying the edited result.
       expect(after).toHaveLength(1);
-      expect(after[0]!.uuid).toBe('edited-result');
-      expect(after[0]!.uuid).not.toBe(originalUuid);
+      expect(after[0]!.uuid).toBe(resultUuid);
       // It's a fresh entry (remove + add), so the internalId changed...
       expect(after[0]!.internalId).not.toBe(originalInternalId);
       // ...the replacement is attributed to the AI Image Editor...
@@ -252,11 +253,7 @@ describe('AiImageEditorPlugin', () => {
     await openModal();
     await page.getByText('Generate image').click();
 
-    const editor = (await vi.waitFor(() => {
-      const el = document.querySelector('uc-ai-image-editor');
-      expect(el).toBeTruthy();
-      return el as HTMLElement;
-    })) as HTMLElement;
+    const editor = await openedEditor('generate');
 
     // The plugin must NOT map `--uc-ai-floating` to the (undefined) `--uc-floating`
     // token — doing so resolves to an invalid value and blanks every panel.
@@ -264,11 +261,9 @@ describe('AiImageEditorPlugin', () => {
 
     // The prompt row's card mixes `--uc-ai-floating`; with a real default it paints.
     const card = await vi.waitFor(() => {
-      const c = editor.shadowRoot
-        ?.querySelector('uc-ai-prompt-row')
-        ?.shadowRoot?.querySelector('.card') as HTMLElement | null;
-      expect(c).toBeTruthy();
-      return c!;
+      const c = editor.shadowRoot?.querySelector('uc-ai-prompt-row')?.shadowRoot?.querySelector('.card');
+      expect(c).toBeInstanceOf(HTMLElement);
+      return c as HTMLElement;
     });
     const bg = getComputedStyle(card).backgroundColor;
     expect(bg).not.toBe('rgba(0, 0, 0, 0)');
diff --git a/packages/ai-image-editor/tests/schema-drift.ts b/packages/ai-image-editor/tests/schema-drift.ts
new file mode 100644
index 0000000..1fe9dcb
--- /dev/null
+++ b/packages/ai-image-editor/tests/schema-drift.ts
@@ -0,0 +1,26 @@
+import { afterEach, beforeEach, vi } from 'vitest';
+
+/** The prefix `uploadcareApiClient.schemas.dev.ts` puts on every contract-drift report. */
+const DRIFT = '[uploadcare-derivative-api]';
+
+/**
+ * Fails the test in which the dev-only schema validation reports a request or response that breaks the derivative
+ * API contract. In the app that report is only a `console.error`; here it means the emulator (or the client) drifted
+ * from the schema, which no assertion would otherwise notice. A test that spies on `console.error` itself replaces
+ * this check for its own duration.
+ */
+export function failOnSchemaDrift(): void {
+  let reports: unknown[][] = [];
+  beforeEach(() => {
+    reports = [];
+    const log = console.error;
+    vi.spyOn(console, 'error').mockImplementation((...args: unknown[]) => {
+      if (typeof args[0] === 'string' && args[0].startsWith(DRIFT)) reports.push(args);
+      log(...args);
+    });
+  });
+  afterEach(() => {
+    if (reports.length)
+      throw new Error(`The derivative API schema validation failed:\n${reports.map(String).join('\n')}`);
+  });
+}
diff --git a/packages/ai-image-editor/tests/setup.ts b/packages/ai-image-editor/tests/setup.ts
new file mode 100644
index 0000000..64d52f4
--- /dev/null
+++ b/packages/ai-image-editor/tests/setup.ts
@@ -0,0 +1,3 @@
+// The emulator lives in its own module: a test importing `session` from the
+// setup file itself would get a second copy of it, and a second emulator.
+import './emulator';
diff --git a/packages/ai-image-editor/tests/specs/setup.ts b/packages/ai-image-editor/tests/specs/setup.ts
new file mode 100644
index 0000000..99a7bc7
--- /dev/null
+++ b/packages/ai-image-editor/tests/specs/setup.ts
@@ -0,0 +1,30 @@
+import type { EmulatorSession } from '@uploadcare/api-emulator';
+import { setupEmulator } from '@uploadcare/api-emulator/node';
+import { afterAll, beforeEach } from 'vitest';
+import { failOnSchemaDrift } from '../schema-drift';
+
+/**
+ * The Uploadcare emulator behind this process's `fetch` and `node:http(s)`, for Uploadcare's hosts and
+ * `upload.example.com` (the specs' custom `baseUrl`; the emulator routes by path, so it answers there too). Every
+ * other origin fails.
+ */
+const emulator = setupEmulator({ cdnHosts: ['upload.example.com'] });
+
+/** The current test's emulator session, for a spec that registers a scenario or reads `requests`. */
+export let session: EmulatorSession;
+
+/** The current test's requests to `route` (`'METHOD /path/'`, on any host), oldest first. */
+export const requestsTo = (route: string) => {
+  const [method, path] = route.split(' ');
+  return session.requests.filter((request) => request.method === method && new URL(request.url).pathname === path);
+};
+
+/** Every test starts against an empty session. */
+beforeEach(async () => {
+  session = await emulator.reset();
+});
+
+failOnSchemaDrift();
+
+/** Removes the emulator's global patches, so a worker shared with a later file starts clean. */
+afterAll(() => emulator.stop());
diff --git a/packages/ai-image-editor/tests/test-renderer.ts b/packages/ai-image-editor/tests/test-renderer.ts
index 891ff26..82ffe1b 100644
--- a/packages/ai-image-editor/tests/test-renderer.ts
+++ b/packages/ai-image-editor/tests/test-renderer.ts
@@ -40,7 +40,3 @@ declare module 'vitest/browser' {
 export function getCtxName(): string {
   return `test-${Math.random().toString(36).slice(2)}`;
 }
-
-export function delay(ms: number): Promise<void> {
-  return new Promise((resolve) => setTimeout(resolve, ms));
-}
diff --git a/packages/ai-image-editor/vite.config.ts b/packages/ai-image-editor/vite.config.ts
index a88bc7a..041668a 100644
--- a/packages/ai-image-editor/vite.config.ts
+++ b/packages/ai-image-editor/vite.config.ts
@@ -2,10 +2,16 @@ import { resolve } from 'node:path';
 import { defineConfig } from 'vite';
 import dts from 'vite-plugin-dts';
 
+// Vite 8's default CSS minifier, Lightning CSS, drops the unprefixed `backdrop-filter` when
+// `-webkit-backdrop-filter` follows it (no blur in Chrome/Firefox) and rewrites `light-dark()`
+// into vars that only flip on a `color-scheme` it compiled itself, so a host page's
+// `color-scheme` stops reaching the editor. esbuild keeps the CSS as Vite 6 shipped it.
+const cssMinify = 'esbuild';
+
 export default defineConfig(({ command, mode }) => {
   if (command === 'serve') {
     return {
-      root: resolve(__dirname, 'demo'),
+      root: resolve(import.meta.dirname, 'demo'),
       server: { open: '/standalone.html' },
     };
   }
@@ -13,18 +19,19 @@ export default defineConfig(({ command, mode }) => {
   // Static demo site build: vite build --mode demo
   if (mode === 'demo') {
     return {
-      root: resolve(__dirname, 'demo'),
+      root: resolve(import.meta.dirname, 'demo'),
       build: {
-        outDir: resolve(__dirname, 'dist-demo'),
+        outDir: resolve(import.meta.dirname, 'dist-demo'),
         emptyOutDir: true,
-        rollupOptions: {
+        cssMinify,
+        rolldownOptions: {
           // shimmer-lab.html is deliberately absent: it is a renderer-tuning
           // harness, so it stays a `vite dev` page (which serves any HTML under
           // the demo root) rather than shipping to the published playground.
           input: {
-            index: resolve(__dirname, 'demo/index.html'),
-            standalone: resolve(__dirname, 'demo/standalone.html'),
-            plugin: resolve(__dirname, 'demo/plugin.html'),
+            index: resolve(import.meta.dirname, 'demo/index.html'),
+            standalone: resolve(import.meta.dirname, 'demo/standalone.html'),
+            plugin: resolve(import.meta.dirname, 'demo/plugin.html'),
           },
         },
       },
@@ -33,12 +40,16 @@ export default defineConfig(({ command, mode }) => {
 
   return {
     build: {
+      // Vite 6's default ('modules'), pinned: Vite 7+ raised it to Safari 16.4 / Chrome 111,
+      // which would ship unlowered syntax (class static blocks, `??=`) to consumers.
+      target: ['es2020', 'edge88', 'firefox78', 'chrome87', 'safari14'],
       cssCodeSplit: false,
+      cssMinify,
       lib: {
         entry: {
-          'ai-image-editor': resolve(__dirname, 'src/index.ts'),
-          plugin: resolve(__dirname, 'src/plugin.ts'),
-          errors: resolve(__dirname, 'src/errors.ts'),
+          'ai-image-editor': resolve(import.meta.dirname, 'src/index.ts'),
+          plugin: resolve(import.meta.dirname, 'src/plugin.ts'),
+          errors: resolve(import.meta.dirname, 'src/errors.ts'),
         },
         name: '@uploadcare/ai-image-editor',
         formats: ['es', 'cjs'],
@@ -46,7 +57,7 @@ export default defineConfig(({ command, mode }) => {
         // (dist/<entry>.js for ESM, dist/<entry>.cjs for CommonJS).
         fileName: (format, entryName) => `${entryName}.${format === 'es' ? 'js' : 'cjs'}`,
       },
-      rollupOptions: {
+      rolldownOptions: {
         // Not bundled, so the editor shares one copy with File Uploader: the
         // plugin gets the uploader's token function, and a second bundled copy
         // of `AuthTokenResolverError` fails `instanceof` and wraps it again.
@@ -58,6 +69,9 @@ export default defineConfig(({ command, mode }) => {
           /^@uploadcare\/upload-client(\/|$)/,
         ],
         output: {
+          // Rolldown drops both by default; Rollup kept them
+          strict: true,
+          comments: { legal: true },
           globals: {
             lit: 'lit',
             '@uploadcare/file-uploader': 'UC',
@@ -65,6 +79,6 @@ export default defineConfig(({ command, mode }) => {
         },
       },
     },
-    plugins: [dts({ rollupTypes: true, insertTypesEntry: true, exclude: ['**/*.dev.ts', '**/*.test.ts'] })],
+    plugins: [dts({ bundleTypes: true, insertTypesEntry: true, exclude: ['**/*.dev.ts', '**/*.test.ts'] })],
   };
 });
diff --git a/packages/ai-image-editor/vitest.config.ts b/packages/ai-image-editor/vitest.config.ts
index 1c6f543..6f1c440 100644
--- a/packages/ai-image-editor/vitest.config.ts
+++ b/packages/ai-image-editor/vitest.config.ts
@@ -1,8 +1,12 @@
 import { playwright } from '@vitest/browser-playwright';
-import { defineConfig } from 'vitest/config';
+import { msw } from 'msw/vite';
+import { configDefaults, defineConfig } from 'vitest/config';
 
 export default defineConfig({
   test: {
+    // Every spy and stubbed global is undone before the next test, so none leaks into a test that runs after it.
+    restoreMocks: true,
+    unstubGlobals: true,
     projects: [
       {
         extends: true,
@@ -10,13 +14,32 @@ export default defineConfig({
           name: 'specs',
           include: ['src/**/*.test.ts'],
           environment: 'happy-dom',
+          setupFiles: ['tests/specs/setup.ts'],
         },
       },
       {
         extends: true,
+        test: {
+          // The derivative API contract: against the emulator by default, against the real API with
+          // `UC_CONTRACT_TARGET=live` (`npm run test:contract:live`), where a generation takes a while.
+          name: 'contract',
+          include: ['tests/contract/**/*.test.ts'],
+          environment: 'node',
+          setupFiles: ['tests/contract/setup.ts'],
+          testTimeout: process.env.UC_CONTRACT_TARGET === 'live' ? 180_000 : undefined,
+        },
+      },
+      {
+        extends: true,
+        // Serves msw 3's /mockServiceWorker.js, which the browser emulator registers, from this repo's msw
+        // rather than whichever copy @vitest/browser happens to resolve.
+        plugins: [msw({ mode: 'worker-only' })],
         test: {
           name: 'e2e',
           include: ['tests/**/*.test.{ts,tsx}'],
+          // The contract tests run in node, in their own project.
+          exclude: [...configDefaults.exclude, 'tests/contract/**'],
+          setupFiles: ['tests/setup.ts'],
           browser: {
             provider: playwright(),
             instances: [{ browser: 'chromium' }],
diff --git a/packages/react-ai-image-editor/.gitignore b/packages/react-ai-image-editor/.gitignore
index 4200423..ac35091 100644
--- a/packages/react-ai-image-editor/.gitignore
+++ b/packages/react-ai-image-editor/.gitignore
@@ -1,2 +1,2 @@
-tests/__screenshots__/
+__screenshots__/
 .vitest-attachments/
diff --git a/packages/react-ai-image-editor/package.json b/packages/react-ai-image-editor/package.json
index 799560a..7f43144 100644
--- a/packages/react-ai-image-editor/package.json
+++ b/packages/react-ai-image-editor/package.json
@@ -35,6 +35,7 @@
     "react": ">= 17.0.0"
   },
   "devDependencies": {
+    "@uploadcare/api-emulator": "file:/Users/nd0ut/workspace/uc-586-sync/packages/api-emulator",
     "@types/react": "^19",
     "@types/react-dom": "^19",
     "react": "^19",
diff --git a/packages/react-ai-image-editor/tests/e2e/client.e2e.test.tsx b/packages/react-ai-image-editor/tests/e2e/client.e2e.test.tsx
index 9b50abf..257cb78 100644
--- a/packages/react-ai-image-editor/tests/e2e/client.e2e.test.tsx
+++ b/packages/react-ai-image-editor/tests/e2e/client.e2e.test.tsx
@@ -1,26 +1,13 @@
 import type { DoneDetail, UcAiImageEditor } from '@uploadcare/ai-image-editor';
 import React from 'react';
+import { flushSync } from 'react-dom';
 import { createRoot, type Root } from 'react-dom/client';
-import { afterEach, beforeAll, expect, it, vi } from 'vitest';
+import { afterEach, expect, it, vi } from 'vitest';
 
 import { AiImageEditorError } from '@uploadcare/ai-image-editor/errors';
-import { AiImageEditor, preloadAiImageEditor } from '../../src';
+import { AiImageEditor } from '../../src';
 import { setupContainers } from '../support/containers';
 
-// The real element talks to Uploadcare APIs once connected; stub the network
-// so tests are hermetic (same approach as packages/ai-image-editor e2e tests).
-const realFetch = globalThis.fetch;
-beforeAll(() => {
-  globalThis.fetch = (async () =>
-    new Response(JSON.stringify({}), {
-      status: 200,
-      headers: { 'Content-Type': 'application/json' },
-    })) as typeof fetch;
-  return () => {
-    globalThis.fetch = realFetch;
-  };
-});
-
 const makeContainer = setupContainers();
 
 const roots: Root[] = [];
@@ -147,8 +134,8 @@ it('updated callback props receive events (no stale handlers)', async () => {
   );
 
   const root = roots[roots.length - 1];
-  root.render(<AiImageEditor pubkey="test-pubkey" onCancel={second} />);
-  await new Promise((r) => setTimeout(r, 50));
+  // Commits synchronously, layout effects included, so @lit/react has swapped the listener before the event.
+  flushSync(() => root.render(<AiImageEditor pubkey="test-pubkey" onCancel={second} />));
 
   const el = container.querySelector('uc-ai-image-editor') as UcAiImageEditor;
   el.dispatchEvent(new CustomEvent('uc:cancel'));
@@ -156,17 +143,6 @@ it('updated callback props receive events (no stale handlers)', async () => {
   expect(second).toHaveBeenCalledTimes(1);
 });
 
-it('preloadAiImageEditor warms the engine cache', async () => {
-  preloadAiImageEditor();
-  const container = render(<AiImageEditor pubkey="test-pubkey" />);
-  await vi.waitFor(
-    () => {
-      expect(container.querySelector('uc-ai-image-editor')).not.toBeNull();
-    },
-    { timeout: 10_000 },
-  );
-});
-
 it('shares one AiImageEditorError class identity across package entries', async () => {
   // both imports resolve to built dist files here, so this guards the
   // bundling contract: instanceof must work across the main and /errors entries
diff --git a/packages/react-ai-image-editor/tests/e2e/setup.ts b/packages/react-ai-image-editor/tests/e2e/setup.ts
new file mode 100644
index 0000000..25c5644
--- /dev/null
+++ b/packages/react-ai-image-editor/tests/e2e/setup.ts
@@ -0,0 +1,13 @@
+import { setupEmulator } from '@uploadcare/api-emulator/browser';
+import { beforeEach } from 'vitest';
+
+/**
+ * The Uploadcare emulator, running in the page. These tests mount the real element and only drive the React
+ * wrapper, so nothing should reach the network today; if the element starts to, Uploadcare requests are answered
+ * here and any other origin fails the request loudly instead of going out.
+ */
+const emulator = setupEmulator();
+
+beforeEach(async () => {
+  await emulator.reset();
+});
diff --git a/packages/react-ai-image-editor/tests/hydration/fallback.test.tsx b/packages/react-ai-image-editor/tests/hydration/fallback.test.tsx
new file mode 100644
index 0000000..dc1653b
--- /dev/null
+++ b/packages/react-ai-image-editor/tests/hydration/fallback.test.tsx
@@ -0,0 +1,60 @@
+import React from 'react';
+import { createRoot } from 'react-dom/client';
+import { expect, it, vi } from 'vitest';
+
+import { AiImageEditor } from '../../src';
+import { setupContainers } from '../support/containers';
+
+// The engine import is gated so the test can observe the fallback before it resolves. A module resolves once per
+// file, so this test has a file to itself: sharing one, it would pass only when it happened to run first.
+let releaseImport: () => void;
+const importGate = new Promise<void>((resolve) => {
+  releaseImport = resolve;
+});
+
+vi.mock('@uploadcare/ai-image-editor', async () => {
+  await importGate;
+  return (await import('../support/fake-editor')).defineFakeEditor();
+});
+
+const makeContainer = setupContainers();
+
+it('shows the fallback until the engine loads, then swaps in the element with wired props and events', async () => {
+  const container = makeContainer();
+  const onDone = vi.fn();
+  const apiRef = React.createRef<HTMLElement>();
+
+  const root = createRoot(container);
+  root.render(
+    <AiImageEditor
+      pubkey="test-pubkey"
+      className="my-class"
+      apiRef={apiRef}
+      onDone={onDone}
+      fallback={<div data-testid="skeleton" />}
+    />,
+  );
+
+  // engine import is still gated: fallback must be visible
+  await vi.waitFor(() => {
+    expect(container.querySelector('[data-testid="skeleton"]')).not.toBeNull();
+  });
+  expect(container.querySelector('uc-ai-image-editor')).toBeNull();
+
+  releaseImport();
+
+  await vi.waitFor(() => {
+    expect(container.querySelector('uc-ai-image-editor')).not.toBeNull();
+  });
+  const el = container.querySelector('uc-ai-image-editor') as HTMLElement & { pubkey: string };
+  expect(container.querySelector('[data-testid="skeleton"]')).toBeNull();
+  expect(el.pubkey).toBe('test-pubkey');
+  expect(el.getAttribute('class')).toBe('my-class');
+  expect(apiRef.current).toBe(el);
+
+  el.dispatchEvent(new CustomEvent('uc:done', { detail: { some: 'detail' } }));
+  expect(onDone).toHaveBeenCalledWith({ some: 'detail' });
+
+  root.unmount();
+  expect(container.querySelector('uc-ai-image-editor')).toBeNull();
+});
diff --git a/packages/react-ai-image-editor/tests/hydration/hydration.test.tsx b/packages/react-ai-image-editor/tests/hydration/hydration.test.tsx
index ccbde20..24243fb 100644
--- a/packages/react-ai-image-editor/tests/hydration/hydration.test.tsx
+++ b/packages/react-ai-image-editor/tests/hydration/hydration.test.tsx
@@ -6,77 +6,12 @@ import { expect, it, vi } from 'vitest';
 import { AiImageEditor } from '../../src';
 import { setupContainers } from '../support/containers';
 
-// Deterministic stand-in for the real Lit element: accessors live on the
-// prototype (like Lit's @property) so the adapter's prop-splitting treats them
-// as element properties. The import is gated so the first test can observe the
-// pre-resolution fallback state.
-let releaseImport: () => void;
-const importGate = new Promise<void>((resolve) => {
-  releaseImport = resolve;
-});
-
-vi.mock('@uploadcare/ai-image-editor', async () => {
-  await importGate;
-  class UcAiImageEditor extends HTMLElement {
-    #pubkey = '';
-    get pubkey() {
-      return this.#pubkey;
-    }
-    set pubkey(value: string) {
-      this.#pubkey = value;
-    }
-  }
-  customElements.define('uc-ai-image-editor', UcAiImageEditor);
-  return { UcAiImageEditor };
-});
+vi.mock('@uploadcare/ai-image-editor', async () => (await import('../support/fake-editor')).defineFakeEditor());
 
 const makeContainer = setupContainers();
 
-it('shows the fallback until the engine loads, then swaps in the element with wired props and events', async () => {
-  const container = makeContainer();
-  const onDone = vi.fn();
-  const apiRef = React.createRef<HTMLElement>();
-
-  const root = createRoot(container);
-  root.render(
-    <AiImageEditor
-      pubkey="test-pubkey"
-      className="my-class"
-      apiRef={apiRef}
-      onDone={onDone}
-      fallback={<div data-testid="skeleton" />}
-    />,
-  );
-
-  // engine import is still gated: fallback must be visible
-  await vi.waitFor(() => {
-    expect(container.querySelector('[data-testid="skeleton"]')).not.toBeNull();
-  });
-  expect(container.querySelector('uc-ai-image-editor')).toBeNull();
-
-  releaseImport();
-
-  await vi.waitFor(() => {
-    expect(container.querySelector('uc-ai-image-editor')).not.toBeNull();
-  });
-  const el = container.querySelector('uc-ai-image-editor') as HTMLElement & { pubkey: string };
-  expect(container.querySelector('[data-testid="skeleton"]')).toBeNull();
-  expect(el.pubkey).toBe('test-pubkey');
-  expect(el.getAttribute('class')).toBe('my-class');
-  expect(apiRef.current).toBe(el);
-
-  el.dispatchEvent(new CustomEvent('uc:done', { detail: { some: 'detail' } }));
-  expect(onDone).toHaveBeenCalledWith({ some: 'detail' });
-
-  root.unmount();
-  expect(container.querySelector('uc-ai-image-editor')).toBeNull();
-});
-
 it('hydrates server HTML without hydration mismatches', async () => {
-  releaseImport(); // in case the first test didn't run (order independence)
-  const ui = (
-    <AiImageEditor pubkey="test-pubkey" fallback={<div data-testid="skeleton">loading</div>} />
-  );
+  const ui = <AiImageEditor pubkey="test-pubkey" fallback={<div data-testid="skeleton">loading</div>} />;
   const serverHtml = renderToString(ui);
   expect(serverHtml).toContain('skeleton');
 
@@ -97,7 +32,6 @@ it('hydrates server HTML without hydration mismatches', async () => {
 });
 
 it('uc:cancel and uc:error events reach their callbacks', async () => {
-  releaseImport(); // in case the first test didn't run (order independence)
   const container = makeContainer();
   const onCancel = vi.fn();
   const onError = vi.fn();
diff --git a/packages/react-ai-image-editor/tests/hydration/preload.test.tsx b/packages/react-ai-image-editor/tests/hydration/preload.test.tsx
new file mode 100644
index 0000000..72a8526
--- /dev/null
+++ b/packages/react-ai-image-editor/tests/hydration/preload.test.tsx
@@ -0,0 +1,15 @@
+import { expect, it, vi } from 'vitest';
+
+import { preloadAiImageEditor } from '../../src';
+
+// A file of its own: a module resolves once per file, so an earlier render here would have loaded the engine already.
+vi.mock('@uploadcare/ai-image-editor', async () => (await import('../support/fake-editor')).defineFakeEditor());
+
+it('preloadAiImageEditor loads the engine before anything renders', async () => {
+  expect(customElements.get('uc-ai-image-editor')).toBeUndefined();
+
+  preloadAiImageEditor();
+
+  // Loading the engine registers the element; nothing has been rendered.
+  await vi.waitFor(() => expect(customElements.get('uc-ai-image-editor')).toBeDefined());
+});
diff --git a/packages/react-ai-image-editor/tests/support/fake-editor.ts b/packages/react-ai-image-editor/tests/support/fake-editor.ts
new file mode 100644
index 0000000..e8802ae
--- /dev/null
+++ b/packages/react-ai-image-editor/tests/support/fake-editor.ts
@@ -0,0 +1,17 @@
+/**
+ * Deterministic stand-in for the real Lit element, for a `vi.mock('@uploadcare/ai-image-editor')` factory: accessors
+ * live on the prototype (like Lit's `@property`) so the adapter's prop-splitting treats them as element properties.
+ */
+export function defineFakeEditor() {
+  class UcAiImageEditor extends HTMLElement {
+    #pubkey = '';
+    get pubkey() {
+      return this.#pubkey;
+    }
+    set pubkey(value: string) {
+      this.#pubkey = value;
+    }
+  }
+  customElements.define('uc-ai-image-editor', UcAiImageEditor);
+  return { UcAiImageEditor };
+}
diff --git a/packages/react-ai-image-editor/vite.config.ts b/packages/react-ai-image-editor/vite.config.ts
index eb74ba5..77d22ae 100644
--- a/packages/react-ai-image-editor/vite.config.ts
+++ b/packages/react-ai-image-editor/vite.config.ts
@@ -5,23 +5,28 @@ import dts from 'vite-plugin-dts';
 export default defineConfig(({ command }) => {
   if (command === 'serve') {
     return {
-      root: resolve(__dirname, 'src/demo'),
+      root: resolve(import.meta.dirname, 'src/demo'),
     };
   }
   return {
     build: {
+      // Vite 6's default ('modules'), pinned: Vite 7+ raised it to Safari 16.4 / Chrome 111
+      target: ['es2020', 'edge88', 'firefox78', 'chrome87', 'safari14'],
       lib: {
-        entry: resolve(__dirname, 'src/index.ts'),
+        entry: resolve(import.meta.dirname, 'src/index.ts'),
         name: '@uploadcare/react-ai-image-editor',
         formats: ['es', 'cjs'],
         fileName: 'react-ai-image-editor',
       },
-      rollupOptions: {
+      rolldownOptions: {
         // @lit/react is ESM-only (no require condition) — bundle it so the CJS
         // build doesn't require() an ESM module (breaks on Node < 22.12)
         external: ['react', '@uploadcare/ai-image-editor', '@uploadcare/ai-image-editor/errors'],
         output: {
-          // Rollup strips module-level directives when bundling; Next.js needs
+          // Rolldown drops "use strict" and legal comments (the @lit/react license) by default; Rollup kept them
+          strict: true,
+          comments: { legal: true },
+          // Rolldown strips module-level directives when bundling; Next.js needs
           // 'use client' at the top of the shipped files to mark the client
           // boundary (no-op elsewhere)
           banner: "'use client';",
@@ -31,6 +36,6 @@ export default defineConfig(({ command }) => {
         },
       },
     },
-    plugins: [dts({ rollupTypes: true, insertTypesEntry: true })],
+    plugins: [dts({ bundleTypes: true, insertTypesEntry: true })],
   };
 });
diff --git a/packages/react-ai-image-editor/vitest.config.ts b/packages/react-ai-image-editor/vitest.config.ts
index fee5959..0d89a87 100644
--- a/packages/react-ai-image-editor/vitest.config.ts
+++ b/packages/react-ai-image-editor/vitest.config.ts
@@ -1,8 +1,12 @@
 import { playwright } from '@vitest/browser-playwright';
+import { msw } from 'msw/vite';
 import { defineConfig } from 'vitest/config';
 
 export default defineConfig({
   test: {
+    // Every spy and stubbed global is undone before the next test, so none leaks into a test that runs after it.
+    restoreMocks: true,
+    unstubGlobals: true,
     projects: [
       {
         extends: true,
@@ -40,9 +44,12 @@ export default defineConfig({
       },
       {
         extends: true,
+        // Serves msw 3's /mockServiceWorker.js for the in-page emulator (tests/e2e/setup.ts).
+        plugins: [msw({ mode: 'worker-only' })],
         test: {
           name: 'e2e',
           include: ['tests/e2e/**/*.test.{ts,tsx}'],
+          setupFiles: ['tests/e2e/setup.ts'],
           browser: {
             provider: playwright(),
             instances: [{ browser: 'chromium' }],