Backing out of a text channel loops

[fluxbug-flutter]

Steps to reproduce

1. Your previous activities in the app seem to affect how this bug manifests, so to get a clean slate first fully close and reopen the app
2. Tap on a community
3. Tap on a text channel
4. Spam the back button

Expected behaviour

Back once should exit the channel; Back twice should close the app.

Actual behaviour

Back once exits the channel as expected. Back twice reopens the channel. Back thrice closes the channel. Rinse and repeat.

Client and system settings

Version 1.0.0, Beta 37, Channel Beta, Build 2187, Android 16 (arm64), Device Google Pixel 9a, Locale en-US, Push fcm, Flutter 3.44.6, Dart 3.12.2

Stances

Approvals

• CR - Version 1.0.0, Beta 37, Channel Beta, Build 2187, Android 15 (arm64), Device Fairphone FP5, Locale de-CH, Push fcm, Flutter 3.44.6, Dart 3.12.2
• CR: Version 1.0.0, Beta 38, Channel Beta, Build 2199, Android 17 (arm64), Device Google Pixel 7a, Locale de-DE, Push fcm, Flutter 3.44.7, Dart 3.12.2
• CR: Version 1.0.0, Channel Canary, Build 2207, Android 15 (arm64), Device OnePlus CPH2465, Locale en-GB, Push fcm, Flutter 3.44.8, Dart 3.12.2

Denials

None

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Reported: #1244