Audit and remediate contrast across every built-in theme

[FNDEVVE]

What changed

• adds a deterministic WCAG 2.2 theme contrast audit derived from the built-in theme registry
• hand-remediates contrast across 52 themes and 78 supported light/dark variants
• aligns warning banners, file-browser status markers, and deletion highlights with the exact rendered combinations the audit measures
• adds a strict CI gate that fails on contrast regressions, missing selectors, unresolved tokens, or orphaned theme stylesheets

Results

• 52 registered themes
• 78 supported variants
• 3,432 semantic states evaluated
• 3,432 passing states
• 0 failing states

This is a claim about the enumerated theme contrast states, not whole-product WCAG conformance.

Verification

bun test packages/ui/audit/audit.test.ts
bun run theme:audit -- --strict
bun run --cwd apps/guides-show check:manifest
bun run typecheck

Observed locally: 21 focused tests passed, strict audit passed at 100%, the generated guide viewer manifest is in sync, and workspace typecheck passed. The corrected deletion/warning/error/success states were also rendered in the live plan UI and visually inspected.

Video

plannotator-theme-wcag-all-themes.mp4

The video captures the 78-variant palette remediation. Its numeric overlay predates the final review pass that added five exact rendered-state checks; the source-of-truth result is the current 3,432-state strict CI audit above.