feat(frontend): improve error handling and UX - Sprint 3 Story 4

Add comprehensive error handling with Error Boundary and improve user feedback.

Changes:
- Created global ErrorBoundary component with fallback UI using react-error-boundary
- Integrated ErrorBoundary in root layout to catch all errors
- Created Loading component with variants (sm, md, lg) for consistent loading states
- Created EmptyState component for better empty data display with CTAs
- Improved form error messages in login and register pages (consistent destructive styling)
- Updated projects page to use EmptyState component
- Added better error handling with retry actions

UX improvements:
- Better error messages and recovery options with clear action buttons
- Consistent loading indicators across all pages
- Helpful empty states with clear descriptions and CTAs
- Graceful error handling without crashes
- Consistent destructive color theme for all error messages

Technical:
- Installed react-error-boundary package (v5)
- All TypeScript types are properly defined
- Build and type checking pass successfully

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

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

app/(auth)/login/page.tsx

@@ -56,9 +56,9 @@ function LoginContent() {
           )}
 
           {error && (
-            <div className="rounded bg-red-50 p-3 text-sm text-red-600">
+            <div className="rounded-md bg-destructive/10 border border-destructive/20 p-3 text-sm text-destructive">
               {(error as { response?: { data?: { message?: string } } })
-                ?.response?.data?.message || 'Login failed. Please try again.'}
+                ?.response?.data?.message || 'Login failed. Please check your credentials and try again.'}
             </div>
           )}
 
@@ -72,7 +72,7 @@ function LoginContent() {
               placeholder="your-company"
             />
             {errors.tenantSlug && (
-              <p className="mt-1 text-sm text-red-600">{errors.tenantSlug.message}</p>
+              <p className="mt-1 text-sm text-destructive">{errors.tenantSlug.message}</p>
             )}
           </div>
 
@@ -86,7 +86,7 @@ function LoginContent() {
               placeholder="you@example.com"
             />
             {errors.email && (
-              <p className="mt-1 text-sm text-red-600">{errors.email.message}</p>
+              <p className="mt-1 text-sm text-destructive">{errors.email.message}</p>
             )}
           </div>
 
@@ -100,7 +100,7 @@ function LoginContent() {
               placeholder="••••••••"
             />
             {errors.password && (
-              <p className="mt-1 text-sm text-red-600">
+              <p className="mt-1 text-sm text-destructive">
                 {errors.password.message}
               </p>
             )}

app/(auth)/register/page.tsx

@@ -54,10 +54,10 @@ export default function RegisterPage() {
           className="mt-8 space-y-6 rounded-lg bg-white p-8 shadow"
         >
           {error && (
-            <div className="rounded bg-red-50 p-3 text-sm text-red-600">
+            <div className="rounded-md bg-destructive/10 border border-destructive/20 p-3 text-sm text-destructive">
               {(error as { response?: { data?: { message?: string } } })
                 ?.response?.data?.message ||
-                'Registration failed. Please try again.'}
+                'Registration failed. Please check your information and try again.'}
             </div>
           )}
 
@@ -71,7 +71,7 @@ export default function RegisterPage() {
               placeholder="John Doe"
             />
             {errors.fullName && (
-              <p className="mt-1 text-sm text-red-600">
+              <p className="mt-1 text-sm text-destructive">
                 {errors.fullName.message}
               </p>
             )}
@@ -87,7 +87,7 @@ export default function RegisterPage() {
               placeholder="you@example.com"
             />
             {errors.email && (
-              <p className="mt-1 text-sm text-red-600">{errors.email.message}</p>
+              <p className="mt-1 text-sm text-destructive">{errors.email.message}</p>
             )}
           </div>
 
@@ -101,7 +101,7 @@ export default function RegisterPage() {
               placeholder="••••••••"
             />
             {errors.password && (
-              <p className="mt-1 text-sm text-red-600">
+              <p className="mt-1 text-sm text-destructive">
                 {errors.password.message}
               </p>
             )}
@@ -120,7 +120,7 @@ export default function RegisterPage() {
               placeholder="Acme Inc."
             />
             {errors.tenantName && (
-              <p className="mt-1 text-sm text-red-600">
+              <p className="mt-1 text-sm text-destructive">
                 {errors.tenantName.message}
               </p>
             )}

app/(dashboard)/projects/page.tsx

@@ -2,9 +2,9 @@
 
 import { useState } from 'react';
 import Link from 'next/link';
-import { Plus, FolderKanban, Calendar } from 'lucide-react';
+import { Plus, FolderKanban, Calendar, AlertCircle } from 'lucide-react';
 import { Button } from '@/components/ui/button';
-import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
 import { Badge } from '@/components/ui/badge';
 import { Skeleton } from '@/components/ui/skeleton';
 import {
@@ -17,6 +17,7 @@ import {
 import { useProjects } from '@/lib/hooks/use-projects';
 import { ProjectForm } from '@/components/projects/project-form';
 import { formatDistanceToNow } from 'date-fns';
+import { EmptyState } from '@/components/ui/empty-state';
 
 export default function ProjectsPage() {
   const [isCreateDialogOpen, setIsCreateDialogOpen] = useState(false);
@@ -52,19 +53,15 @@ export default function ProjectsPage() {
 
   if (error) {
     return (
-      <div className="flex items-center justify-center min-h-[400px]">
-        <Card className="w-full max-w-md">
-          <CardHeader>
-            <CardTitle className="text-destructive">Error Loading Projects</CardTitle>
-            <CardDescription>
-              {error instanceof Error ? error.message : 'Failed to load projects'}
-            </CardDescription>
-          </CardHeader>
-          <CardContent>
-            <Button onClick={() => window.location.reload()}>Retry</Button>
-          </CardContent>
-        </Card>
-      </div>
+      <EmptyState
+        icon={AlertCircle}
+        title="Failed to load projects"
+        description={error instanceof Error ? error.message : 'An error occurred while loading projects. Please try again.'}
+        action={{
+          label: 'Retry',
+          onClick: () => window.location.reload(),
+        }}
+      />
     );
   }
 
@@ -121,17 +118,15 @@ export default function ProjectsPage() {
           ))}
         </div>
       ) : (
-        <Card className="flex flex-col items-center justify-center py-16">
-          <FolderKanban className="h-12 w-12 text-muted-foreground mb-4" />
-          <CardTitle className="mb-2">No projects yet</CardTitle>
-          <CardDescription className="mb-4">
-            Get started by creating your first project
-          </CardDescription>
-          <Button onClick={() => setIsCreateDialogOpen(true)}>
-            <Plus className="mr-2 h-4 w-4" />
-            Create Project
-          </Button>
-        </Card>
+        <EmptyState
+          icon={FolderKanban}
+          title="No projects yet"
+          description="Get started by creating your first project to organize your work and track progress."
+          action={{
+            label: 'Create Project',
+            onClick: () => setIsCreateDialogOpen(true),
+          }}
+        />
       )}
 
       {/* Create Project Dialog */}

app/layout.tsx

@@ -4,6 +4,7 @@ import "./globals.css";
 import { QueryProvider } from "@/lib/providers/query-provider";
 import { SignalRProvider } from "@/lib/signalr/SignalRContext";
 import { Toaster } from "@/components/ui/sonner";
+import { ErrorBoundary } from "@/components/ErrorBoundary";
 
 const geistSans = Geist({
   variable: "--font-geist-sans",
@@ -30,12 +31,14 @@ export default function RootLayout({
       <body
         className={`${geistSans.variable} ${geistMono.variable} antialiased`}
       >
-        <QueryProvider>
-          <SignalRProvider>
-            {children}
-            <Toaster position="top-right" />
-          </SignalRProvider>
-        </QueryProvider>
+        <ErrorBoundary>
+          <QueryProvider>
+            <SignalRProvider>
+              {children}
+              <Toaster position="top-right" />
+            </SignalRProvider>
+          </QueryProvider>
+        </ErrorBoundary>
       </body>
     </html>
   );