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>

manager_dashboard/src/App.jsx

@@ -4,7 +4,7 @@ import useAuthStore from './store/authStore'
 import AppLayout from './layouts/AppLayout'
 import LoginPage from './pages/LoginPage'
 import SetupWizard from './pages/SetupWizard'
-import OperationsPage from './pages/OperationsPage'
+import DashboardPage from './pages/DashboardPage'
 import TablesPage from './pages/TablesPage'
 import OrderDetailPage from './pages/OrderDetailPage'
 import ManagementPage from './pages/ManagementPage'
@@ -74,9 +74,9 @@ export default function App() {
           <Route path="/setup" element={<SetupWizard />} />
           <Route path="/login" element={<SetupGuard><LoginPage /></SetupGuard>} />
           <Route path="/" element={<RequireAuth><AppLayout /></RequireAuth>}>
-            <Route index element={<Navigate to="/operations" replace />} />
-            <Route path="dashboard" element={<Navigate to="/operations" replace />} />
-            <Route path="operations" element={<OperationsPage />} />
+            <Route index element={<Navigate to="/dashboard" replace />} />
+            <Route path="operations" element={<Navigate to="/dashboard" replace />} />
+            <Route path="dashboard" element={<DashboardPage />} />
             <Route path="tables" element={<TablesPage />} />
             <Route path="orders/:orderId" element={<OrderDetailPage />} />
             <Route path="management" element={<ManagementPage />} />