[lgollut]

Importing some VS Code themes leaves every destructive control blank: the close-terminal Confirm button and the composer stop button render as white with white text. With "Gruvbox Theme" (jdinhlife, from Open VSX), Gruvbox Dark Medium was saved with error: #ffffff.

The importer required error and warning to reach 4.5:1 against the editor background. When neither the theme's color nor the derived default passed, it fell back to pure white (black on light themes). Gruvbox Dark Medium sets editorError.foreground to #cc241d, which reaches 2.69:1 on its #282828 background, and the derived default #fb414a reaches 4.18:1, so the error color became white. That fallback works for text roles, but error also fills destructive buttons and the stop button, which always draw white text.

Status colors now keep their hue and only shift lightness until they reach 4.5:1 (readableThemeColorOn in themePalette.ts, built on the existing solveOklchLightness), so Gruvbox's #cc241d becomes #f95546. The helper returns the 8-bit color it measured, because the unrounded OKLCH value can drop just under 4.5:1 once stored. A status color hidden in the canvas (fully transparent) has no hue to keep, so the derived color is used, as before. Status colors that already passed are unchanged, and other roles still use readableOn.

Label contrast on destructive buttons is a separate, pre-existing limit. They draw hard-coded text-white on the error color, and no color reaches 4.5:1 against both a dark background like #282828 and white text. This PR takes Gruvbox Dark Medium's labels from 1:1 (white on white) to 3.27:1, close to the 3.53:1 of the built-in dark themes. Reaching 4.5:1 there would need a dedicated destructive-foreground role across all themes, so it's out of scope here.

This falls under the small-obvious-bug exception in CONTRIBUTING: one importer role mapping plus a helper, limited to the web importer (desktop wraps web; mobile doesn't import VS Code themes). Themes imported before this fix keep their stored white until they are re-imported or their Error color is edited in the theme editor.

Evidence

	Before	After
Close terminal dialog
Composer stop button

Before: the released desktop app with Gruvbox Dark Medium imported. After: a dev build of this branch with isolated state. I installed "Gruvbox Theme" from Open VSX (Settings → Appearance → Add theme) and selected Gruvbox Medium in dark mode. Running this branch's importer on that extension's gruvbox-dark-medium.json gives error: #f95546 on the same #282828 background.

Verification

• New tests in apps/web/src/vscodeThemeImport.test.ts:
  • A dim red and amber (#fb4934 / #b57614) on a dark #282828 and a light #ffffff canvas. Each status color must reach 4.5:1 and keep its chroma and hue. On main they come out white or black (chroma 0).
  • A fully transparent editorError.foreground must fall back to the derived red.
• vp test run src/vscodeThemeImport.test.ts src/themePalette.test.ts in apps/web: 74 passed, rebased on current main.
• tsc-rs --noEmit for apps/web, plus vp lint and vp fmt --check on the touched files: clean.
• Reviewed independently before opening. That review found the rounding and transparency cases, now fixed and covered above.

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📝 Walkthrough

The theme palette adds contrast-based color adjustment. The VS Code theme importer uses it for error and warning colors. Tests verify contrast, chroma, hue, and transparent color handling.

Changes: Status color contrast

Layer / File(s)	Summary
Theme color adjustment apps/web/src/themePalette.ts	Adds readableThemeColorOn, which preserves valid readable colors and adjusts OKLCH lightness when the requested contrast is not met.
Importer integration and validation apps/web/src/vscodeThemeImport.ts, apps/web/src/vscodeThemeImport.test.ts	The importer selects specified or derived status colors, then adjusts them to 4.5:1 contrast. Tests verify contrast, chroma, hue, and transparent input behavior.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Suggested reviewers: maria-rcks

Merge Risk: 🔵 Low · up to 08253

Imported status colors can leave white labels on status-colored controls below normal-text contrast on dark canvases. This bounded, known limitation warrants owner awareness, but does not block merging.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title clearly and concisely identifies the main fix: imported VS Code themes preserve red destructive controls.
Description check		The description explains the problem, root cause, implementation, scope, limitations, visual evidence, tests, and verification results. It does not use the exact template headings for Change and Scope…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description explains the problem, root cause, implementation, scope, limitations, visual evidence, tests, and verification results. It does not use the exact template headings for Change and Scope and approval, but it provides the required information, including the small-obvious-bug exception.

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Inline comments:
Review comments at @apps/web/src/vscodeThemeImport.ts:
- Line 262: Update the `readableThemeColorOn` logic for the imported
`error`/`--destructive` color so the destructive background achieves at least
4.5:1 contrast with its white button text, rather than validating only against
the editor canvas. Preserve the destructive background role and avoid a
white-on-white fallback.

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• apps/web/src/vscodeThemeImport.ts

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