Implements the main navigation and layout structure:
- Sidebar component with collapsible navigation and keyboard shortcut
- AppHeader with project switcher and user menu
- AppBreadcrumbs with auto-generation from pathname
- ProjectSwitcher dropdown for quick project navigation
- UserMenu with profile, settings, and logout
- AppLayout component combining all layout elements
Features:
- Responsive design (mobile sidebar sheet, desktop sidebar)
- Keyboard navigation (Cmd/Ctrl+B to toggle sidebar)
- Dark mode support
- WCAG AA accessible (ARIA labels, focus management)
All 125 tests passing. Follows design system guidelines.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
