fix(web): update pills use readable theme foregrounds

[chrisdeeming]

What Changed

• Use the dedicated updateForeground token for sidebar update-pill content.
• Give T3 Code Dark a lighter update foreground with AA-compliant contrast.
• Apply the foreground token consistently to desktop and provider update pills.
• Add a regression test for the T3 Code Dark palette contrast.

Why

Update pills used the stronger update accent as text over updateSurface, producing insufficient contrast across most built-in themes.

Using the existing semantic foreground role fixes the named themes without changing their palettes. T3 Code Dark also needed a distinct updateForeground, changed from #366ffb to #5c86ff.

WCAG 2.2 AA requires at least 4.5:1 contrast for this 12px normal text. Before this change, the update label passed in only 1 of the 12 built-in theme/mode combinations; the other 11 ranged from 2.04:1 to 4.30:1. Using updateForeground raises every named theme to AA, while the dedicated T3 Code Dark adjustment raises its remaining failure from 3.88:1 to 5.08:1.

Theme	Before	After
T3 Code Dark	3.88:1 — Fail	5.08:1 — Pass AA
T3 Chat Light	3.17:1 — Fail	5.50:1 — Pass AA
T3 Chat Dark	2.04:1 — Fail	11.72:1 — Pass AA

UI Changes

Theme	Before	After
T3 Code Dark
T3 Chat Light
T3 Chat Dark

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes — Not applicable; no motion or interaction changed.

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Note

Low Risk
Visual token and class changes only; no behavior, data, or security surface.

Overview
Fixes low-contrast text on sidebar update pills by using the semantic updateForeground role instead of the strong update accent for labels and icons.

Desktop and provider update pills now apply text-update-foreground (and the dismiss control matches). Dark default tokens remap --update-foreground from primary blue to var(--color-blue-400), and T3 Code Dark sets updateForeground to #51a2ff so small text on updateSurface meets WCAG AA against the tinted pill background.

^{Reviewed by Cursor Bugbot for commit 13c0b81. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix pill text colors to use readable update-foreground theme tokens

Updates sidebar update pills to use the text-update-foreground color token instead of text-update for text and icons. Also remaps --update-foreground to --color-blue-400 in index.css and updates the T3 Code dark theme palette in themePalette.ts to a lighter blue value.

^{Macroscope summarized 13c0b81.}

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[macroscopeapp]

Approvability

Verdict: Approved 13c0b81

Purely cosmetic styling changes that update CSS class names and color values to improve text readability in sidebar pills. No runtime behavior impact beyond visual appearance.

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