Raise library/workbench tab text contrast to WCAG AA on dark surfaces

[Copilot]

Canonical issue

WCAG AA contrast failure for dim/accent text in the library/workbench tab rail on dark surfaces.

Outcome

Inactive and accent tab labels now meet AA (≥4.5:1) against the evidence surface, improving scanability without changing layout or flow.

style={{
  color: active ? accent : 'rgba(248,245,253,0.5)', // was 0.4
  borderBottom: active ? `2px solid ${accent}` : '2px solid transparent',
  background: active ? `${accent}0d` : 'transparent',
}}

Scope

• Included:
  • Contrast correction: Updated inactive tab label color opacity in apps/web/src/components/dashboard/DashboardCanvasView.tsx.
  • Regression guard: Added apps/web/src/lib/__tests__/library-contrast.test.ts with WCAG luminance/contrast assertions for dim and accent tab text.
• Explicitly excluded:
  • No structural UI refactors, token system changes, or non-tab color updates.
  • No backend/API/workflow changes.

Risk

• Risk level: low
• Failure mode: Tab label visual delta could be perceived as slightly brighter than before.
• Rollback: Revert commit 161b001 (single style line + isolated test file).

Verification

List exact automated and manual checks, tied to the current head SHA.

• Head SHA: 161b001
• Focused tests
  • npm run test --workspace eventrelay-web -- src/lib/__tests__/library-contrast.test.ts src/lib/__tests__/dashboard-search-accessibility.test.ts
• Required CI
• Review threads resolved

Production evidence

Not applicable yet: change is a scoped UI contrast fix plus static contrast regression tests; no production-only behavior path introduced.

Agent handoff

• One canonical issue is linked
• No competing PR implements the same issue
• Acceptance criteria are satisfied
• Required checks pass on the current head
• Human decision is requested only for product, security, irreversible infrastructure, or production approval

• Fixes Fix WCAG AA contrast for dim and accent library page text #1824

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Project	Deployment	Actions	Updated
v0-uvai	Ready	Preview, v0	Sep 9, 2026 7:07pm UTC