add:テーマ機能

[SmiSANN]

No description provided.

[Copilot]

Pull request overview

This PR introduces a user-selectable theme feature for the client UI, including persistence and early application to reduce startup flicker. It also updates multiple views/components to use new theme-driven color tokens.

Changes:

• Add theme preference model + application helpers (document + Tauri window), and persist theme to localStorage/SQLite.
• Add a Theme section to Settings and propagate theme-aware text/icon styles across views/components.
• Introduce CSS theme tokens (including calendar heatmap + ranking/warning colors) and switch UI styling to rely on them.

Reviewed changes

Copilot reviewed 18 out of 19 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
client/src/views/WorldsView.tsx	Switch headings to theme-driven primary text color.
client/src/views/SettingsView.tsx	Add Theme selection UI and persistence logic; update various text colors to theme token.
client/src/views/RankingView.tsx	Replace hardcoded medal colors with theme tokens; adjust heading text color.
client/src/views/FavoritesView.tsx	Switch title text to theme-driven primary color.
client/src/views/CalendarView.tsx	Make heatmap colors/theme tokens; adjust headings/hover text to use theme token.
client/src/store/useAppStore.ts	Add theme state + caching in the store.
client/src/main.tsx	Apply cached theme before first React render to reduce flicker.
client/src/lib/theme.ts	New theme preference/types + document/window theme application utilities.
client/src/lib/strings.ts	Add theme-related strings.
client/src/index.css	Add theme variables, utilities, and token-based styling for multiple themes.
client/src/hooks/useTheme.ts	New hook to apply theme changes to document and native window.
client/src/hooks/useInitApp.ts	Restore theme from SQLite on startup.
client/src/components/UploadWarningDialog.tsx	Use theme token for warning icon/title color.
client/src/components/UpdateDialog.tsx	Use theme-driven primary text color and adjust button hover color.
client/src/components/OnboardingOverlay.tsx	Update title text color; remove backdrop blur.
client/src/components/AutoStartDialog.tsx	Use theme-driven primary text color and adjust button hover color.
client/src/components/AppShell.tsx	Activate theme hook; swap hardcoded overlay colors for CSS variables; remove glow utility usage.
client/src-tauri/Cargo.lock	Bump app version recorded in lockfile.
client/src-tauri/capabilities/default.json	Allow Tauri window theme setting capability.

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