Runs the whole app on seeded in-memory data with no backend or device
storage, behind useMockData in lib/Grounded/mock/MockSwitch.dart. To
remove: delete lib/Grounded/mock/ and the lines tagged "MOCK:" in
ParentViewModel (or revert this commit, keeping the notification guard).
Also skips local notifications on web, where the plugin and dart:io
Platform both throw.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KhQh614DMeYoQEH9SoMRUw
