feat(a11y): accessibility baseline — skip link, landmarks, route-change focus

[JarbasAl]

Adds the structural WCAG 2.2 baseline to the SPA.

One change, 2 files:

• index.html — skip-to-content link (hidden until focused); nav[aria-label=Primary]; focusable <main tabindex=-1>; focus management on hash-route change (new view's heading/main receives focus so screen-reader users hear the change — the biggest SPA a11y gap); polite live region on the toast container; :focus-visible rings on all interactive elements.
• docs/local-development.md — a11y note + honest follow-up list.

Explicitly deferred (follow-ups, noted in docs): an axe-core CI gate (needs a Playwright harness), a per-view single-h1 audit, and a dark-theme contrast pass. Automated tools catch only ~30–40% of issues, so a manual keyboard + screen-reader pass is still required before release.

Local: node --check on the SPA script → OK; full pytest test/ → 169 passed.

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 60e138ac-6b2d-437a-bf46-22b1ac0a4cec

📥 Commits

Reviewing files that changed from the base of the PR and between 5dc8e63 and e467264.

📒 Files selected for processing (2)

• docs/local-development.md
• index.html

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/accessibility

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