- Create ThemeContext with light/dark/system mode support
- Add DarkColors palette for dark mode UI
- Extend Colors object with full dark theme variants
- Update useThemeColor hook to use ThemeContext
- Add useThemeColors, useResolvedTheme, useIsDarkMode hooks
- Update RootLayout (native and web) with ThemeProvider
- Add theme toggle UI in ProfileDrawer settings
- Theme preference persisted to AsyncStorage
- Add comprehensive tests for ThemeContext and hooks
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Sergei
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