thanks for your thoughts.
I've already thought about Flutter and looked a bit deeper into it, it's not like I'm not looking forward to a mobile app^^
I personally think I would more likely go with React-Native and Rust as a native back end instead of Flutter.
Not only am I way more fluent...
Introduced permissions b_channel_create_modify_conversation_mode_private, b_channel_create_modify_conversation_mode_public and b_channel_create_modify_conversation_mode_none
Guess these permissions pushed some permissions over the 255 boundary^^