Two changes prevent the crash reported on Samsung S1RXS32.50-13-25:
1. Add WidgetsFlutterBinding.ensureInitialized() to callbackDispatcher so
that Flutter platform channels (including path_provider) are available
when WorkManager triggers background sync. Without it the channel is
permanently unavailable in that isolate regardless of how long we wait.
2. Add an Android-specific fallback in _resolveDatabasePath: after all
back-off retries fail, derive the app files-dir path from
/proc/self/cmdline (the Android process name equals the package name)
without a platform channel. This lets the database open on devices
where path_provider is broken even in the main isolate.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
