Fix dark theme select popups

[Finesssee]

Summary

• stop forcing the shared native select control into the light color scheme
• apply explicit dark native select/option colors under the dark theme
• preserve the existing light popup behavior with an explicit light color scheme

Fixes #470

Validation

• reproduced on the exact shipped v0.56.8 Windows build with CUA: the dark Settings surface opened the native select popup with a white background and low-contrast option text
• pnpm --dir apps/desktop-tauri test: 59 files, 343 tests passed
• pnpm --dir apps/desktop-tauri run build: passed, including locale drift check and TypeScript build
• git diff --check: passed
• fresh pnpm --dir apps/desktop-tauri run tauri:build:debug was attempted for post-fix CUA proof. The frontend build completes, but Rust dependency build scripts fail because this machine resolves link.exe to C:\Program Files\Git\usr\bin\link.exe instead of the MSVC linker. A fresh desktop binary could therefore not be produced locally for post-fix CUA capture.

UI proof note

The pre-fix native WebView2 popup was captured on Windows. The fix is limited to the theme-specific CSS controlling that same native select. Hosted Windows CI should provide the fresh build gate; post-fix native-popup CUA is the only local check blocked by the machine linker configuration.

Summary by CodeRabbit

• Style
  • Improved dark-theme select controls with darker option backgrounds and clearer selected-option styling.
  • Preserved light-theme appearance for select controls.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: e119143d-4708-457c-ac96-618708077d58

📥 Commits

Reviewing files that changed from the base of the PR and between f650147 and 3e8b873.

📒 Files selected for processing (1)

• apps/desktop-tauri/src/styles.css

Included review availability: Your plan provides up to 4 included reviews per hour; 2 remain after this review.

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📝 Walkthrough

Walkthrough

Select controls now use explicit theme-specific color schemes. Dark-theme options use dark backgrounds, and selected options use the accent color with white text. Light-theme controls retain a light color scheme.

Changes

Select theme styling

Layer / File(s)	Summary
Theme-specific select rules apps/desktop-tauri/src/styles.css	Dark-theme selects now style options with dark colors and accent-colored checked options. Light-theme selects explicitly use a light color scheme.

Priority: ➖ Normal

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

Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 3e8b8

Native select popups now use theme-appropriate colors in dark and light modes, restoring readable dark-theme options without changing application behavior beyond select styling.

Suggested reviewers: xuelongmu, blazzzplay

🚥 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: fixing dark-theme select popups.
Linked Issues check	✅ Passed	The changes address issue #470 by applying dark styling to native select popups and options while preserving explicit light-theme behavior.
Out of Scope Changes check	✅ Passed	The changes are limited to select popup color-scheme and option styling in styles.css. They are directly related to issue #470 and the stated PR objectives.
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…

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/issue-470-dark-select

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