feat: Add Discord-like project switcher sidebar with icon support

- Add project icon field to ProjectRef and Project types
- Create vertical project switcher sidebar component
  - Project icons with hover tooltips
  - Active project highlighting
  - Plus button to create new projects
  - Right-click context menu for edit/delete
- Add IconPicker component with 35+ Lucide icons
- Add EditProjectDialog for inline project editing
- Update settings appearance section with project details editor
- Add setProjectIcon and setProjectName actions to app store
- Integrate ProjectSwitcher in root layout (shows on app pages only)

Implements #469

Co-authored-by: Web Dev Cody <webdevcody@users.noreply.github.com>

apps/ui/src/lib/electron.ts

@@ -3104,6 +3104,7 @@ export interface Project {
   lastOpened?: string;
   theme?: string; // Per-project theme override (uses ThemeMode from app-store)
   isFavorite?: boolean; // Pin project to top of dashboard
+  icon?: string; // Lucide icon name for project identification
 }
 
 export interface TrashedProject extends Project {