Allow mobile notification grouping for notification spam

(#3593) Feature Open: In progress mobile notifications

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Comment by Eyeflame
EyeflameReviewer 1 vote Merged from #3439
Can reproduce CR; Version 2026.10.100, Beta 2, Channel Beta, Build 591, Android 13 (arm64), Device Xiaomi 21061110AG, Locale en-US, Push fcm, Flutter 3.47.6, Dart 3.13.5