fix(a11y): muted secondary text meets WCAG AA — tertiary token 0.55→0.62#71
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Session 375 contrast audit: the light themes' text.tertiary alpha (0.55) rendered muted secondary labels — 'Sort by: Name', '4 days ago', type tags, empty-state hints — at 4.09:1 on the app background, just under WCAG AA (4.5:1). Bumped the alpha to 0.62 across the 5 light themes (default / high-contrast / the three tinted lights), clearing AA (~4.8:1) with a small legibility gain and no change to the dark themes (their light-on-dark tertiary is already ≥0.6). Confirmed on Files / Contacts / Mailbox: 4.09:1 findings → 0. The dark themes measured clean (bg rgb(22,22,22), 0 findings across 5 apps incl. theme-editor); the phantom-token class that caused past unreadable-on-dark panels is already CI-guarded by check-css-tokens. Remaining below-AA text is accent-COLOURED brand text (links/tags at 3.2–3.9:1) — a separate brand decision, left as-is. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Session 375 contrast audit: the light themes' text.tertiary alpha (0.55) rendered muted secondary labels — 'Sort by: Name', '4 days ago', type tags, empty-state hints — at 4.09:1 on the app background, just under WCAG AA (4.5:1). Bumped the alpha to 0.62 across the 5 light themes (default / high-contrast / the three tinted lights), clearing AA (~4.8:1) with a small legibility gain and no change to the dark themes (their light-on-dark tertiary is already ≥0.6). Confirmed on Files / Contacts / Mailbox: 4.09:1 findings → 0. The dark themes measured clean (bg rgb(22,22,22), 0 findings across 5 apps incl. theme-editor); the phantom-token class that caused past unreadable-on-dark panels is already CI-guarded by check-css-tokens. Remaining below-AA text is accent-COLOURED brand text (links/tags at 3.2–3.9:1) — a separate brand decision, left as-is.