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/components/ui/tabs.tsx

@@ -0,0 +1,90 @@
+'use client';
+
+import * as React from 'react';
+import { cn } from '@/lib/utils';
+
+interface TabsContextValue {
+  value: string;
+  onValueChange: (value: string) => void;
+}
+
+const TabsContext = React.createContext<TabsContextValue | null>(null);
+
+function useTabs() {
+  const context = React.useContext(TabsContext);
+  if (!context) throw new Error('Tabs components must be used within <Tabs>');
+  return context;
+}
+
+interface TabsProps extends React.HTMLAttributes<HTMLDivElement> {
+  value: string;
+  onValueChange: (value: string) => void;
+}
+
+function Tabs({ value, onValueChange, className, ...props }: TabsProps) {
+  return (
+    <TabsContext.Provider value={{ value, onValueChange }}>
+      <div className={cn('w-full', className)} {...props} />
+    </TabsContext.Provider>
+  );
+}
+
+const TabsList = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => (
+    <div
+      ref={ref}
+      className={cn(
+        'inline-flex h-10 items-center justify-center rounded-md bg-muted p-1 text-muted-foreground',
+        className,
+      )}
+      {...props}
+    />
+  ),
+);
+TabsList.displayName = 'TabsList';
+
+interface TabsTriggerProps extends React.ButtonHTMLAttributes<HTMLButtonElement> {
+  value: string;
+}
+
+const TabsTrigger = React.forwardRef<HTMLButtonElement, TabsTriggerProps>(
+  ({ className, value, ...props }, ref) => {
+    const { value: selectedValue, onValueChange } = useTabs();
+    return (
+      <button
+        ref={ref}
+        className={cn(
+          'inline-flex items-center justify-center whitespace-nowrap rounded-sm px-3 py-1.5 text-sm font-medium ring-offset-background transition-all focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50',
+          selectedValue === value
+            ? 'bg-background text-foreground shadow-sm'
+            : 'hover:bg-background/50',
+          className,
+        )}
+        onClick={() => onValueChange(value)}
+        {...props}
+      />
+    );
+  },
+);
+TabsTrigger.displayName = 'TabsTrigger';
+
+interface TabsContentProps extends React.HTMLAttributes<HTMLDivElement> {
+  value: string;
+}
+
+const TabsContent = React.forwardRef<HTMLDivElement, TabsContentProps>(
+  ({ className, value, ...props }, ref) => {
+    const { value: selectedValue } = useTabs();
+    if (selectedValue !== value) return null;
+    return (
+      <div
+        ref={ref}
+        className={cn('mt-2 ring-offset-background focus-visible:outline-none', className)}
+        {...props}
+      />
+    );
+  },
+);
+TabsContent.displayName = 'TabsContent';
+
+export { Tabs, TabsList, TabsTrigger, TabsContent };