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>

app/layout.tsx

@@ -3,6 +3,7 @@ import { Geist, Geist_Mono } from "next/font/google";
 import "./globals.css";
 import { QueryProvider } from "@/lib/providers/query-provider";
 import { SignalRProvider } from "@/components/providers/SignalRProvider";
+import { Toaster } from "@/components/ui/sonner";
 
 const geistSans = Geist({
   variable: "--font-geist-sans",
@@ -30,7 +31,10 @@ export default function RootLayout({
         className={`${geistSans.variable} ${geistMono.variable} antialiased`}
       >
         <QueryProvider>
-          <SignalRProvider>{children}</SignalRProvider>
+          <SignalRProvider>
+            {children}
+            <Toaster position="top-right" />
+          </SignalRProvider>
         </QueryProvider>
       </body>
     </html>