- Add language and theme selector submenus to UserMenu component for quick access
- Refactor shared utilities: extract THEME_OPTIONS constant and getLocaleDisplayName() function
- Update LocaleSelect and ThemeSelect to use shared utilities, eliminating code duplication
- Make UserMenu reactive with MobX observer for real-time setting updates
- Fix language switching reactivity by immediately updating workspaceStore.state.locale
- Add scrollable menu support for language selector (max-h-[90vh])
- Apply same instant locale update to PreferencesSection for consistency
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Co-Authored-By: Claude <noreply@anthropic.com>
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