Add CI pipeline, pre-commit hooks, and offline caching

Configure GitHub Actions for linting, typechecking, and testing.
Add Husky and lint-staged for pre-commit checks. Implement API
response caching in AsyncStorage for offline support. Move core
tests to packages/core and add vitest configuration.

package.json

@@ -12,29 +12,24 @@
     "start": "npm run start -w apps/web",
     "lint": "npm run lint -w apps/web && npm run lint -w apps/mobile && npm run lint -w packages/core && npm run lint -w packages/api-client",
     "typecheck": "npm run typecheck -w apps/web && npm run typecheck -w apps/mobile && npm run typecheck -w packages/core && npm run typecheck -w packages/api-client",
-    "test": "npm run test -w apps/web && npm run test -w apps/mobile",
+    "test": "npm run test -w apps/web && npm run test -w apps/mobile && npm run test -w packages/core",
     "dev:mobile": "npm run start -w apps/mobile",
     "typecheck:mobile": "npm run typecheck -w apps/mobile",
-    "android": "expo run:android",
-    "ios": "expo run:ios"
+    "prepare": "husky"
+  },
+  "lint-staged": {
+    "*.{ts,tsx}": [
+      "eslint --fix",
+      "bash -c 'npm run typecheck'"
+    ]
   },
   "overrides": {
     "react": "19.1.0",
     "react-dom": "19.1.0",
     "react-test-renderer": "19.1.0"
   },
-  "dependencies": {
-    "@react-native-async-storage/async-storage": "2.2.0",
-    "expo": "~54.0.34",
-    "expo-calendar": "~15.0.8",
-    "expo-dev-client": "~6.0.21",
-    "expo-location": "~19.0.8",
-    "expo-notifications": "~0.32.17",
-    "expo-status-bar": "~3.0.9",
-    "react": "19.1.0",
-    "react-native": "0.81.5",
-    "react-native-safe-area-context": "~5.6.0",
-    "react-native-screens": "~4.16.0",
-    "react-native-svg": "^15.15.5"
+  "devDependencies": {
+    "husky": "^9.1.7",
+    "lint-staged": "^17.0.5"
   }
 }