feat: major dashboard & waiter PWA overhaul

- Manager dashboard: replaced monolithic DashboardTab/OperationsPage with new
  DashboardPage; added OrderDetailModal, ShiftDetailModal, DeleteConfirmModal,
  PaymentMethodModal; updated Sidebar routing and App navigation
- Reports: reworked WorkDaySummary, OrderHistory, ShiftsOverview with detail modals
- Backend routers: extended orders, reports, shifts, products, business_day endpoints;
  updated cloud_sync service
- Waiter PWA: refreshed app icons, improved ConnectionLostModal UX, updated
  TableCard, SSEContext, connectionStore; added useProductCache hook; vite config tweaks

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

waiter_pwa/src/pages/AddItemsPage.jsx

@@ -3,6 +3,7 @@ import { useNavigate, useParams, useSearchParams } from 'react-router-dom'
 import ProductPicker from '../components/ProductPicker'
 import OrderDrawer from '../components/OrderDrawer'
 import client from '../api/client'
+import { useProductCache } from '../hooks/useProductCache'
 
 export default function AddItemsPage() {
   const { tableId } = useParams()
@@ -10,8 +11,8 @@ export default function AddItemsPage() {
   const isNewTable = searchParams.get('new') === '1'
   const navigate = useNavigate()
 
-  const [categories, setCategories] = useState([])
-  const [products, setProducts] = useState([])
+  const { products, categories } = useProductCache()
+
   const [cart, setCart] = useState([])
   const [orderId, setOrderId] = useState(null)
   const [sending, setSending] = useState(false)
@@ -24,16 +25,9 @@ export default function AddItemsPage() {
   const [searchOpen, setSearchOpen] = useState(false)
   const [searchQuery, setSearchQuery] = useState('')
 
-
   useEffect(() => {
     async function load() {
-      const [catRes, prodRes, statusRes] = await Promise.all([
-        client.get('/api/products/categories'),
-        client.get('/api/products/'),
-        client.get(`/api/tables/${tableId}/status`),
-      ])
-      setCategories(catRes.data)
-      setProducts(prodRes.data)
+      const statusRes = await client.get(`/api/tables/${tableId}/status`)
       setOrderId(statusRes.data.active_order_id)
 
       // Pre-populate cart from "order again" if present