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fix(frontend,macos): reduce dark mode white flash on window open

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Detect dark/light mode before React hydrates to eliminate the visible
white-to-dark flash when opening windows in dark mode.

Frontend:
- Inline script now reads next-themes localStorage key and applies
  .dark class, colorScheme, and backgroundColor on <html> before first
  paint
- Add CSS-only fallback via prefers-color-scheme media query in an
  inline <style> tag that fires before any JS executes

macOS backend:
- Detect system dark mode via `defaults read -g AppleInterfaceStyle`
  (cached with OnceLock) and set native window background color to
  match dark theme in apply_platform_window_style
- Persist user appearance mode preference (dark/light/system) to DB
  alongside zoom level so new windows use the correct background
- Add update_appearance_mode Tauri command; frontend syncs on mount,
  on settings change, and on cross-window storage events

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
xintaofei
2026-04-13 11:15:13 +08:00
parent e05ae76453
commit 41b28001af
7 changed files with 145 additions and 9 deletions
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5
src-tauri/src/lib.rs
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@@ -83,9 +83,9 @@ mod tauri_app {
}
}
// Load saved zoom level for traffic-light positioning before
// any window is created.
// Load saved appearance settings before any window is created.
tauri::async_runtime::block_on(windows::load_saved_zoom(&db.conn));
tauri::async_runtime::block_on(windows::load_saved_appearance_mode(&db.conn));
// Install bundled expert skills into the central store
// (`~/.codeg/skills/`). Runs in the background and does
@@ -341,6 +341,7 @@ mod tauri_app {
windows::open_push_window,
windows::open_project_boot_window,
windows::update_traffic_light_position,
windows::update_appearance_mode,
project_boot::detect_package_manager,
project_boot::create_shadcn_project,
system_settings::get_system_proxy_settings,