fix(office-addin): sync office-addin-excel-customfunctions with upstream

[teamstoolkitworkflowapp]

Automated upstream sync: office-addin-excel-customfunctions

Upstream: OfficeDev/Excel-Custom-Functions@release

This PR was generated from the Office Add-in drift audit. Review carefully — the edits were produced by Copilot from the audit judgment.

It also bumps this template's entry in .github/office-addin-upstream-baseline.json to the synced upstream state, so merging stops the daily check from re-detecting the same drift.

Audit judgment

VERDICT: UPDATE NEEDED

• src/taskpane/taskpane.ts lacks upstream’s null guards for sideload-msg, app-body, and run; a missing element can abort initialization with a runtime TypeError.
• The same file omits upstream’s Excel.RequestContext annotation; this is type-safety only and has no runtime effect.
• src/functions/functions.ts, both HTML files, and taskpane.css are behaviorally equivalent; the toolkit’s appPackage/assets image path is an intentional layout difference.
• Upstream commits after 64358fbcef changed only convertToSingleHost.js/lockfile handling, not src/ or declared dependencies. With no newly introduced dependency drift, package.json.tpl needs no update.

Upgrade priority: low

Copilot change summary

I’ll apply the audited task-pane-only fix, preserving all template-specific wiring and dependency choices.

The implementation is limited to the audited null safety and type annotation; I’m checking the scoped diff for unintended changes.

Updated templates/vsc/ts/office-addin-excel-customfunctions/src/taskpane/taskpane.ts:

• Added null guards for sideload-msg, app-body, and run to prevent initialization TypeErrors when elements are absent.
• Added the Excel.RequestContext annotation for type safety.

No dependencies, lockfiles, or other template files were changed.

---

Generated by workflow run: https://github.com/OfficeDev/microsoft-365-agents-toolkit/actions/runs/34320513949

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[github-actions]

✅ VscUse Test Plan — All tests passed

Why these tests: The changed TypeScript Office Add-in template has no dedicated listed plan, so the closest VS Code Office Add-in smoke plan was selected.

Branch diff: auto/office-addin-drift/office-addin-excel-customfunctions-34320513949 → dev

Results: ✅ 1 passed · ❌ 0 failed (of 1 plans)

Plans run:

• Sample_Tab_And_Outlook_Addin_Remote_Debug

---

Step	Status
1️⃣ Build VSIX (CD)	✅ Done
2️⃣ Build Docker image	✅ Done
3️⃣ Run UI tests	✅ All tests passed (1/1 passed)

🎯 Actual UI test run
🔗 Full pipeline results
📊 Detailed test report

ℹ️ How were these tests selected?

GitHub Copilot (GPT-5.6-sol, high reasoning) analysed the PR title, description, and the diff between
auto/office-addin-drift/office-addin-excel-customfunctions-34320513949 and dev
to pick the most relevant test plans from packages/tests/vscuse/Index.md.

[github-actions]

E2E Test Selection — AI Selected

Why these tests: The .github baseline change is infrastructure-only, and the Office Add-in template does not match any mapped template category or available e2e test case.

Cases selected (0):

---

View pipeline run

Need to run more tests?

Comment on this PR:

• /e2e-run ./path/to/test.tests.ts — add specific cases to AI selection
• /e2e-run-all — run all e2e cases

Then re-run the workflow.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.21%. Comparing base (bb64bbe) to head (a33a45d).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #16717      +/-   ##
==========================================
- Coverage   88.22%   88.21%   -0.01%     
==========================================
  Files         661      661              
  Lines       36312    36312              
  Branches     8812     8812              
==========================================
- Hits        32035    32034       -1     
- Misses       2342     2343       +1     
  Partials     1935     1935              

see 1 file with indirect coverage changes

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