feat(ui): composer also send to channel

[renefloor]

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Linear: FLU-410

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• I have signed the Stream CLA (required).
• The code changes follow best practices
• Code changes are tested (add some information if not applicable)

Description of the pull request

This updates the UI so there can be a checkbox for 'send to channel' in the thread composer.

Required from core: GetStream/stream-core-flutter#72

Screenshots / Videos

Simulator.Screen.Recording.-.iPhone.17.Pro.Max.-.2026-03-12.at.15.09.22.mov

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.77%. Comparing base (c4ea35a) to head (efc39c1).
⚠️ Report is 1 commits behind head on feat/design-refresh.

Files with missing lines	Patch %	Lines
...message_composer/stream_chat_message_composer.dart	53.33%	7 Missing ⚠️
...r/lib/src/message_input/dm_checkbox_list_tile.dart	0.00%	5 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                   @@
##           feat/design-refresh    #2537      +/-   ##
=======================================================
- Coverage                64.78%   64.77%   -0.02%     
=======================================================
  Files                      437      437              
  Lines                    26539    26536       -3     
=======================================================
- Hits                     17194    17189       -5     
- Misses                    9345     9347       +2     

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