backup: Phase 6 search and export fixes before cleanup

- Added search button to main page header with Ctrl+K listener
- Implemented SearchModal component rendering
- Fixed SearchModal to use axiosInstance with correct backend URL (8916)
- Fixed token key from 'auth_token' to 'inventory_token'
- Verified export endpoints working correctly
- All Phase 6 UAT fixes in place

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

frontend/app/page.tsx

@@ -14,6 +14,7 @@ import ItemComparisonModal from '@/components/ItemComparisonModal';
 import StockAdjustmentPanel from '@/components/StockAdjustmentPanel';
 import NewItemDialog from '@/components/NewItemDialog';
 import ScannerSection from '@/components/ScannerSection';
+import SearchModal from '@/components/inventory/SearchModal';
 import { toast } from 'react-hot-toast';
 import {
   Package,
@@ -59,6 +60,7 @@ export default function Home() {
   const [categories, setCategories] = useState<any[]>([]);
   const [comparisonModal, setComparisonModal] = useState<{ show: boolean, newItem: any, existingItem: any, existingId: number | null }>({ show: false, newItem: null, existingItem: null, existingId: null });
   const [comparisonLoading, setComparisonLoading] = useState(false);
+  const [showSearch, setShowSearch] = useState(false);
 
   const { syncing, handleSync } = useSync({
     isOnline,
@@ -152,6 +154,18 @@ export default function Home() {
     };
   }, []);
 
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if ((e.ctrlKey || e.metaKey) && e.key === 'k') {
+        e.preventDefault();
+        setShowSearch(!showSearch);
+      }
+    };
+
+    window.addEventListener('keydown', handleKeyDown);
+    return () => window.removeEventListener('keydown', handleKeyDown);
+  }, [showSearch]);
+
   const loadInventory = async () => {
     const cached = await db.items.toArray();
     setInventory(cached);
@@ -389,6 +403,13 @@ export default function Home() {
               </div>
             </div>
             <div className="flex items-center gap-2">
+              <button
+                onClick={() => setShowSearch(true)}
+                className="p-2.5 bg-surface border border-slate-800 text-secondary rounded-xl hover:text-white transition-all active:scale-95"
+                title="Search (Ctrl+K)"
+              >
+                <Search size={18} />
+              </button>
               <button
                 onClick={handleSync}
                 disabled={syncing}
@@ -431,6 +452,16 @@ export default function Home() {
           loading={comparisonLoading}
         />
 
+        {/* Search Modal */}
+        <SearchModal
+          isOpen={showSearch}
+          onClose={() => setShowSearch(false)}
+          onSelectItem={(item) => {
+            setSelectedItem(item);
+            setShowSearch(false);
+          }}
+        />
+
         {/* Stock Adjustment Panel */}
         <StockAdjustmentPanel
           selectedItem={selectedItem}