refactor(ui): appbar redesigned

[Brazol]

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Linear: FLU-405

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[codecov]

Codecov Report

❌ Patch coverage is 74.48980% with 50 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.21%. Comparing base (c86af06) to head (330ca35).
⚠️ Report is 2 commits behind head on feat/design-refresh.

Files with missing lines	Patch %	Lines
.../attachment_picker/options/stream_file_picker.dart	0.00%	14 Missing ⚠️
...attachment_picker/options/stream_poll_creator.dart	0.00%	13 Missing ⚠️
...attachment_picker/options/stream_video_picker.dart	0.00%	13 Missing ⚠️
...m_chat_flutter/lib/src/channel/channel_header.dart	89.18%	4 Missing ⚠️
...hat_flutter/lib/src/localization/translations.dart	33.33%	4 Missing ⚠️
...m_chat_flutter/lib/src/gallery/gallery_header.dart	85.71%	1 Missing ⚠️
...utter/lib/src/utils/message_preview_formatter.dart	88.88%	1 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                   @@
##           feat/design-refresh    #2560      +/-   ##
=======================================================
+ Coverage                64.18%   64.21%   +0.02%     
=======================================================
  Files                      430      430              
  Lines                    26353    26439      +86     
=======================================================
+ Hits                     16915    16978      +63     
- Misses                    9438     9461      +23     

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[renefloor]

I think it's good to have this in the component factory, maybe even in core?