Fix build issues after Casera rebranding

- Update google-services.json package name to com.example.casera
- Fix Xcode project paths from MyCrib/ to Casera/
- Update app display name and usage descriptions

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

composeApp/google-services.json

@@ -9,7 +9,7 @@
       "client_info": {
         "mobilesdk_app_id": "1:YOUR_PROJECT_NUMBER:android:YOUR_APP_ID",
         "android_client_info": {
-          "package_name": "com.example.mycrib"
+          "package_name": "com.example.casera"
         }
       },
       "oauth_client": [],