feat(offline): persisted query cache + unreachable banner (web + mobile) (#70)

* feat(offline): persisted query cache + unreachable banner (web + mobile)

- Web: PersistQueryClientProvider on localStorage (24h maxAge); mobile:
  AsyncStorage persister (7d). Both exclude high-churn keys (logs,
  notifications, metrics) — stale tails are worse than none.
- networkMode 'offlineFirst' so cached data serves while the refetch
  attempt fails.
- Web: ConnectivityBanner in PlatformShell pings public /health every
  15s + listens to online/offline events — slim "last-known data" bar
  so persisted state can't masquerade as live.
- Mobile: same banner in the tabs layout — /health ping plus
  expo-network's local signal distinguishes "no connection" from
  "instance down".

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* feat(mobile): cron jobs screen — schedules, run-now, execution history

- /service/cron lists the service's jobs with schedule, timezone,
  last/next run, and last status; "Run now" triggers via the existing
  POST /cron-jobs/:id/trigger and "History" expands recent executions
  with status + output/error.
- Manage row on the service detail + Stack registration.

Verified live: created */5 job on a running service, triggered it —
execution recorded with status success and captured stdout.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

---------

Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

app/frontend/package-lock.json

@@ -31,7 +31,9 @@
         "@tabler/icons-react": "^3.37.1",
         "@tailwindcss/postcss": "^4.1.18",
         "@tailwindcss/typography": "^0.5.19",
+        "@tanstack/query-sync-storage-persister": "^5.104.1",
         "@tanstack/react-query": "^5.66.0",
+        "@tanstack/react-query-persist-client": "^5.104.1",
         "@types/dompurify": "^3.0.5",
         "@xterm/addon-fit": "^0.11.0",
         "@xterm/xterm": "^6.0.0",
@@ -3441,22 +3443,49 @@
       }
     },
     "node_modules/@tanstack/query-core": {
-      "version": "5.90.20",
-      "resolved": "https://registry.npmjs.org/@tanstack/query-core/-/query-core-5.90.20.tgz",
-      "integrity": "sha512-OMD2HLpNouXEfZJWcKeVKUgQ5n+n3A2JFmBaScpNDUqSrQSjiveC7dKMe53uJUg1nDG16ttFPz2xfilz6i2uVg==",
+      "version": "5.104.1",
+      "resolved": "https://registry.npmjs.org/@tanstack/query-core/-/query-core-5.104.1.tgz",
+      "integrity": "sha512-TiRghcrGkUTE+M4JBxvpPSpBhxvIzQairw+cksrHYGr+2uwC77yW1SY9nYxnYRYOppvucf8rEg6b5byoz4rTpw==",
       "license": "MIT",
       "funding": {
         "type": "github",
         "url": "https://github.com/sponsors/tannerlinsley"
       }
     },
-    "node_modules/@tanstack/react-query": {
-      "version": "5.90.21",
-      "resolved": "https://registry.npmjs.org/@tanstack/react-query/-/react-query-5.90.21.tgz",
-      "integrity": "sha512-0Lu6y5t+tvlTJMTO7oh5NSpJfpg/5D41LlThfepTixPYkJ0sE2Jj0m0f6yYqujBwIXlId87e234+MxG3D3g7kg==",
+    "node_modules/@tanstack/query-persist-client-core": {
+      "version": "5.104.1",
+      "resolved": "https://registry.npmjs.org/@tanstack/query-persist-client-core/-/query-persist-client-core-5.104.1.tgz",
+      "integrity": "sha512-ONiadXqe56iNrw6RESqKILpTIVG9ZMI/DageTQnrBDt/nZ6WiP4G13iIiMwJEsiO12gQ3Gychx8tcFIPw4k25g==",
       "license": "MIT",
       "dependencies": {
-        "@tanstack/query-core": "5.90.20"
+        "@tanstack/query-core": "5.104.1"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      }
+    },
+    "node_modules/@tanstack/query-sync-storage-persister": {
+      "version": "5.104.1",
+      "resolved": "https://registry.npmjs.org/@tanstack/query-sync-storage-persister/-/query-sync-storage-persister-5.104.1.tgz",
+      "integrity": "sha512-eDsBMNds48+sjXILn0dQKu+uYwfh9tGIB+Rb0cKRdoxD22HHBMzJes5DJOhJVLUhBQbxtoFq+Hpha/Vohh14NQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@tanstack/query-core": "5.104.1",
+        "@tanstack/query-persist-client-core": "5.104.1"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      }
+    },
+    "node_modules/@tanstack/react-query": {
+      "version": "5.104.1",
+      "resolved": "https://registry.npmjs.org/@tanstack/react-query/-/react-query-5.104.1.tgz",
+      "integrity": "sha512-Zz70EgjahNI7aCz8BZxM3vUGU44ycxEAzMuCUjLeA7SVhhOkg3ZgPjPJPvHjs6Rmky/dtmnu1WzjGHNHmhCoZQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@tanstack/query-core": "5.104.1"
       },
       "funding": {
         "type": "github",
@@ -3466,6 +3495,23 @@
         "react": "^18 || ^19"
       }
     },
+    "node_modules/@tanstack/react-query-persist-client": {
+      "version": "5.104.1",
+      "resolved": "https://registry.npmjs.org/@tanstack/react-query-persist-client/-/react-query-persist-client-5.104.1.tgz",
+      "integrity": "sha512-kU3YaqjkwEUzUUfPF0JVg56d6gJKWHaFVqOlQztwc4C2IT0P5sv/23orrSoQqjxKaUe6Ejw5IIQtA/G12uNmow==",
+      "license": "MIT",
+      "dependencies": {
+        "@tanstack/query-persist-client-core": "5.104.1"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      },
+      "peerDependencies": {
+        "@tanstack/react-query": "^5.104.1",
+        "react": "^18 || ^19"
+      }
+    },
     "node_modules/@testing-library/dom": {
       "version": "10.4.1",
       "resolved": "https://registry.npmjs.org/@testing-library/dom/-/dom-10.4.1.tgz",