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/package-lock.json

@@ -8,6 +8,7 @@
       "name": "waiter_pwa",
       "version": "0.0.0",
       "dependencies": {
+        "@tanstack/react-query": "^5.100.11",
         "axios": "^1.15.1",
         "dexie": "^4.4.2",
         "react": "^19.2.5",
@@ -2250,6 +2251,32 @@
         "string.prototype.matchall": "^4.0.6"
       }
     },
+    "node_modules/@tanstack/query-core": {
+      "version": "5.100.11",
+      "resolved": "https://registry.npmjs.org/@tanstack/query-core/-/query-core-5.100.11.tgz",
+      "integrity": "sha512-lmE0994apShXPj8CUxgx4ch5yUJhE9k/+tVwihBvPOyerACWdBocfFg24t8+0RhtlTd7tEgchDkhlCxNssvDxw==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      }
+    },
+    "node_modules/@tanstack/react-query": {
+      "version": "5.100.11",
+      "resolved": "https://registry.npmjs.org/@tanstack/react-query/-/react-query-5.100.11.tgz",
+      "integrity": "sha512-J0f9s5x3LE1450nNNfYx+e/n0DMa0uOBdFJUy5r0RvmsXd4nB/n0rbHtHI1vYXhikNFan+wf51p6Tmp4c8ucrg==",
+      "license": "MIT",
+      "dependencies": {
+        "@tanstack/query-core": "5.100.11"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      },
+      "peerDependencies": {
+        "react": "^18 || ^19"
+      }
+    },
     "node_modules/@tybys/wasm-util": {
       "version": "0.10.1",
       "resolved": "https://registry.npmjs.org/@tybys/wasm-util/-/wasm-util-0.10.1.tgz",