Filter search to a specific channel

[fluxbug-flutter]

Steps to reproduce

1. Open Search
2. Type "in: searchterm"

Expected behaviour

Only results from the mentioned channel are shown

Actual behaviour

All results from the community are shown

Client and system settings

Version 1.0.0, Beta 36, Channel Beta, Build 2174, Android 15 (arm64), Device Fairphone FP5, Locale de-CH, Push fcm, Flutter 3.44.6, Dart 3.12.2

Stances

Approvals

• CR: Version 1.0.0, Beta 37, Channel Beta, Build 2188, Android 15 (arm64), Device OnePlus CPH2465, Locale en-GB, Push unifiedpush, Flutter 3.44.6, Dart 3.12.2

Denials

None

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Reported: #1191