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/vite.config.js

@@ -13,8 +13,8 @@ export default defineConfig({
     VitePWA({
       registerType: 'autoUpdate',
       manifest: {
-        name: 'TableServe',
-        short_name: 'TableServe',
+        name: 'Xenia',
+        short_name: 'Xenia',
         start_url: '/',
         display: 'standalone',
         background_color: '#0f172a',