feat(frontend): Implement Phase 2 - Complete Projects UI with CRUD operations

Implemented comprehensive Projects UI with full CRUD functionality following
modern React best practices and using shadcn/ui components.

Changes:
- Created ProjectForm component with react-hook-form + zod validation
  - Auto-uppercase project key input
  - Comprehensive field validation (name, key, description)
  - Support for both create and edit modes
  - Toast notifications for success/error states

- Enhanced Projects List Page (app/(dashboard)/projects/page.tsx)
  - Beautiful card-based grid layout with hover effects
  - Skeleton loading states for better UX
  - Empty state with call-to-action
  - Project metadata display (key badge, created date)
  - Integrated ProjectForm in Dialog for creation

- Enhanced Project Detail Page (app/(dashboard)/projects/[id]/page.tsx)
  - Comprehensive project information display
  - Edit functionality with dialog form
  - Delete functionality with confirmation AlertDialog
  - Epics preview section with stats
  - Quick actions sidebar (Kanban, Epics)
  - Statistics card (Total/Active/Completed epics)
  - Skeleton loading states
  - Error handling with retry capability

- Added toast notifications (Sonner)
  - Installed and configured sonner package
  - Added Toaster component to root layout
  - Success/error notifications for all CRUD operations

- Installed required dependencies
  - date-fns for date formatting
  - sonner for toast notifications
  - shadcn/ui alert-dialog component

Technical highlights:
- TypeScript with strict type checking
- React Query for data fetching and caching
- Optimistic updates with automatic rollback
- Responsive design (mobile-friendly)
- Accessibility-focused components
- Clean error handling throughout

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -15,18 +15,21 @@
     "@dnd-kit/utilities": "^3.2.2",
     "@hookform/resolvers": "^5.2.2",
     "@microsoft/signalr": "^9.0.6",
+    "@radix-ui/react-alert-dialog": "^1.1.15",
     "@radix-ui/react-dialog": "^1.1.15",
     "@radix-ui/react-dropdown-menu": "^2.1.16",
     "@radix-ui/react-label": "^2.1.7",
     "@radix-ui/react-select": "^2.2.6",
-    "@radix-ui/react-slot": "^1.2.3",
+    "@radix-ui/react-slot": "^1.2.4",
     "@tanstack/react-query": "^5.90.6",
     "@tanstack/react-query-devtools": "^5.90.2",
     "axios": "^1.13.1",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
+    "date-fns": "^4.1.0",
     "lucide-react": "^0.552.0",
     "next": "16.0.1",
+    "next-themes": "^0.4.6",
     "react": "19.2.0",
     "react-dom": "19.2.0",
     "react-hook-form": "^7.66.0",