Android 16 bug: EncryptedSharedPreferences threw on ANY exception (Keystore
busy during screen-lock/BG wakeup) and the code deleted the encrypted prefs
file on any failure, permanently erasing session cookies. Now only
KeyPermanentlyInvalidatedException (biometric/PIN change) triggers delete;
transient failures preserve the file for the next session.
Also prevents saving cookies to plain-text fallback prefs if encrypted prefs
are unavailable.
WorkManager periodic (15 min, requires network) added alongside AlarmManager
as a Doze-mode backup for Android 16, where inexact alarms can be batched up
to 75 min.
UI: sync icon 24→32dp (large widget), 20→28dp (small); reset-time font
9→11sp (large), 8→10sp (small).
Security:
- All Log.d response-body and URL-bearing logs gated behind BuildConfig.DEBUG
- Cookie header value stripped of CRLF to prevent HTTP header injection
- LoginActivity coroutine migrated from bare CoroutineScope to lifecycleScope
- Widget removed from keyguard (lock-screen) category — usage data is sensitive
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
amir