Muted mode isnt ever-present in applying itself upon channel switching

(#3416) Bug Confirmed mobile

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Comment by Eyeflame
Can reproduce CR - I can only reproduce it in two ways: 1. By closing the app and reopening it in the channel. 2. By switching instances while still in the same channel. Version 2026.09.100, Beta 7, Channel Beta, Build 568, Android 13 (arm64), Device Xiaomi 21061110AG, Locale en-US, Push fcm, Flutter 3.47.5, Dart 3.13.4