Set color-scheme on theme roots for native widget styling

[thiagoburgo]

Browser-painted controls (scrollbars, form widgets, unstyled button fallbacks) did not follow the active FigUI theme. On dark themes, some native UI could still render with light UA defaults.

This adds color-scheme: light on :root and color-scheme: dark on .dark, .anthracite-dark, and .midnight-dark in src/index.css. The property tells the browser which palette to use for native controls without affecting FigUI's custom CSS variables.

Test plan

• Switch between Light, Dark, Anthracite Dark, and Midnight Dark
• Confirm scrollbars and native form controls match the selected theme
• Verify no visual regressions on desktop, tablet, or mobile layouts

Summary by CodeRabbit

• Style
  • Updated light and dark themes so browser-controlled interface elements, such as form fields and scrollbars, better match the selected theme.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Advanced

Run ID: b3ea9776-6114-4537-84fb-70ff2806fec6

📥 Commits

Reviewing files that changed from the base of the PR and between afcb734 and 8560916.

📒 Files selected for processing (1)

• src/index.css

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The CSS now declares light or dark color-scheme values for the default and three dark theme scopes. This affects browser-painted widgets without changing other CSS variables or rules.

Changes

Theme color-scheme support

Layer / File(s)	Summary
Theme scope declarations src/index.css	The :root scope declares color-scheme: light. The .dark, .anthracite-dark, and .midnight-dark scopes declare color-scheme: dark.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix

Suggested reviewers: figamore

Merge Risk: ⚪ Minimal · up to 85609

The change is limited to matching browser-painted controls to each supported theme and presents no identified merge-blocking risk.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding color-scheme declarations to theme roots for native widget styling.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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