Idrinth / habit-evaluator / 22202216450

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Use persistent backup location via SAF to survive app uninstall (#528)

Android daily backups were stored in internal app storage (getFilesDir),
which is deleted when the app is uninstalled. This adds a folder picker
using the Storage Access Framework (ACTION_OPEN_DOCUMENT_TREE) so users
can choose a persistent backup directory in shared storage. The chosen
URI gets persistable read/write permissions and is saved in preferences.

When a persistent location is set, both automatic daily backups and the
restore-from-backup list use the SAF directory. Without one configured,
the existing internal storage fallback is preserved.

Also adds stream-based createBackupBytes() and restoreBackupFromStream()
methods to BackupService so the shared module can produce/consume backup
data without requiring java.io.File, enabling SAF-based I/O on Android.

https://claude.ai/code/session_01E73DjeJH3FzvyfW5A85Nih

Co-authored-by: Claude <noreply@anthropic.com>

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