fix(ui): messages preview fixes + draft message fix

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Linear: FLU-455, FLU-444, FLU-377

Github Issue: #

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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

Screenshots / Videos

draft.mov

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.18%. Comparing base (c86af06) to head (91c280c).
⚠️ Report is 2 commits behind head on feat/design-refresh.

Files with missing lines	Patch %	Lines
...er/lib/src/message_input/stream_message_input.dart	0.00%	5 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                   @@
##           feat/design-refresh    #2563      +/-   ##
=======================================================
- Coverage                64.18%   64.18%   -0.01%     
=======================================================
  Files                      430      430              
  Lines                    26353    26355       +2     
=======================================================
  Hits                     16915    16915              
- Misses                    9438     9440       +2     

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