* Feature: Biometric lock for app resume
User enables "Biometric Lock" in Settings → prompted to verify fingerprint/face first.
User backgrounds the app → _isLocked = true.
User returns → lock screen appears, auto-triggers biometric prompt.
Success → app unlocks, state preserved underneath.
Can retry or log out as fallback.
Add USE_BIOMETRIC permission to AndroidManifest.
* Fix: Remove duplicate local_auth entry in pubspec.lock and add NSFaceIDUsageDescription to iOS Info.plist
* fix(mobile) : Remove duplicate local auth files first
* fix(mobile): keep MainNavigationScreen in the Stack, let the lock screen float above, no unmounting
* Updtae: Swap out Flutter Activity for FlutterFragmentActivity that extends the lock scan feature
* fix(mobile): address biometric lock PR review feedback
* fix(mobile): only require biometric auth when enabling lock, not disabling
Prevents users from getting locked out if biometrics start failing —
they can now disable the lock without needing to pass biometric auth.
* fix(mobile): add missing closing brace in setBiometricEnabled
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Signed-off-by: Tristan Katana <50181095+felixmuinde@users.noreply.github.com>
