fix(a11y): restore the main landmark (A5)

[BrianGenisio]

Closes #39.

Finding

A5 — role="log" on <main> removes the main landmark (serious; WCAG 1.3.1, 2.4.1).

Change

Strip role="log" and aria-live="polite" from #chatHistory so <main> is a landmark again. The A1+A2+A11 foundation PR will add a dedicated status live region; this PR does not introduce a temporary role="log" wrapper.

Also excludes a11y-audits/** from vitest discovery — #38 landed a node:test file that the root suite was picking up.

Baseline

Shrink-only axe baseline drops aria-allowed-role and landmark-one-main in both themes. Remaining region is the sidebar resizer (out of scope here).

Verification

• npm test — 173 passed | 2 expected fail
• A11Y_CI=1 axe gate — passed against updated baseline (light + dark)
• Confirmed axe no longer reports aria-allowed-role / landmark-one-main on empty and settings states

Reference

a11y-audits/8-5-26/audit.md → A5
a11y-audits/8-5-26/resolution-plan.md → Wave 1

Made with Cursor

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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Reviewing files that changed from the base of the PR and between 3e12961 and a4e7f01.

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• vitest.config.js

🚧 Files skipped from review as they are similar to previous changes (1)

• vitest.config.js

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📝 Walkthrough

Walkthrough

The chat history <main> element no longer uses role="log" or aria-live="polite". The axe baseline removes the related aria-allowed-role violations and empty-state landmark-one-main violations. Vitest preserves default exclusions and excludes a11y-audits.

Possibly related PRs

• CodeSignal/learn_cosmo-chat#38: Updates the accessibility baseline and audited chat markup.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the primary accessibility change: restoring the main landmark for A5.
Description check	✅ Passed	The description explains the landmark fix, baseline updates, Vitest exclusion, linked issue, and verification results.
Linked Issues check	✅ Passed	The changes satisfy issue #39 by restoring the main landmark, removing conflicting attributes, updating the baseline, and covering both themes.
Out of Scope Changes check	✅ Passed	All changes support issue #39 or the documented Vitest test-discovery correction; no unrelated code changes are present.

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@vitest.config.js`:
- Around line 1-6: Update the Vitest configuration’s test.exclude entry in
defineConfig to preserve the framework defaults by spreading
configDefaults.exclude before adding the a11y-audits exclusion, ensuring the
default .git and node_modules patterns remain active.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

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Configuration used: Organization UI

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Run ID: f2852deb-e14b-4caf-b15b-097a2b4d4ab2

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Reviewing files that changed from the base of the PR and between 6bca6c6 and 3e12961.

📒 Files selected for processing (3)

• a11y-audits/tools/baseline.json
• public/index.html
• vitest.config.js

💤 Files with no reviewable changes (1)

• a11y-audits/tools/baseline.json

[BrianGenisio]

Addressed review: vitest.config.js now spreads configDefaults.exclude before the a11y-audits exclusion.