[mobile] cannot delete categories in favorites

CR: Version 2026.10.100, Beta 4, Channel Beta, Build 2633, Android 16 (arm64), Device Google Pixel 9a, Locale en-US, Push fcm, Flutter 3.47.7, Dart 3.13.5 Renaming and reordering favorites is also a valid mention, but it'd be good if you could put in a separate feature request for those for tracking purposes. Thanks!