feat(listings-frontend): add create/edit form, detail page, and listing components

- Multi-step wizard for listing creation (basic info, location, details, pricing, images)
- Listing detail page with image gallery, property specs, seller/agent info, stats
- Listings index page with filters (transaction type, property type) and pagination
- Edit page with tab-based form (read-only until backend PATCH endpoint available)
- Drag & drop image upload component with preview and multi-file support
- Dashboard layout with navigation bar
- New UI primitives: textarea, select, badge, tabs
- Listings API client with typed endpoints matching backend contract
- Zod validation schemas for all form steps
- Status badges with Vietnamese labels for all listing states
- Responsive design across all pages

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/app/(dashboard)/layout.tsx

@@ -0,0 +1,61 @@
+'use client';
+
+import Link from 'next/link';
+import { usePathname } from 'next/navigation';
+import { cn } from '@/lib/utils';
+import { useAuthStore } from '@/lib/auth-store';
+import { Button } from '@/components/ui/button';
+
+const navItems = [
+  { href: '/', label: 'Trang chủ', icon: '🏠' },
+  { href: '/listings', label: 'Tin đăng', icon: '📋' },
+  { href: '/listings/new', label: 'Đăng tin', icon: '➕' },
+];
+
+export default function DashboardLayout({ children }: { children: React.ReactNode }) {
+  const pathname = usePathname();
+  const { user, logout } = useAuthStore();
+
+  return (
+    <div className="min-h-screen bg-background">
+      <header className="sticky top-0 z-50 border-b bg-background/95 backdrop-blur supports-[backdrop-filter]:bg-background/60">
+        <div className="mx-auto flex h-14 max-w-7xl items-center px-4">
+          <Link href="/" className="mr-6 flex items-center space-x-2">
+            <span className="text-lg font-bold text-primary">GoodGo</span>
+          </Link>
+
+          <nav className="flex items-center space-x-1">
+            {navItems.map((item) => (
+              <Link
+                key={item.href}
+                href={item.href}
+                className={cn(
+                  'rounded-md px-3 py-2 text-sm font-medium transition-colors hover:bg-accent hover:text-accent-foreground',
+                  pathname === item.href
+                    ? 'bg-accent text-accent-foreground'
+                    : 'text-muted-foreground',
+                )}
+              >
+                <span className="mr-1.5">{item.icon}</span>
+                {item.label}
+              </Link>
+            ))}
+          </nav>
+
+          <div className="ml-auto flex items-center space-x-3">
+            {user && (
+              <span className="text-sm text-muted-foreground">
+                {user.fullName}
+              </span>
+            )}
+            <Button variant="ghost" size="sm" onClick={logout}>
+              Đăng xuất
+            </Button>
+          </div>
+        </div>
+      </header>
+
+      <main className="mx-auto max-w-7xl px-4 py-6">{children}</main>
+    </div>
+  );
+}