refactor(ui): appbar redesigned

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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 65.32%. Comparing base (6af575c) to head (bad74ae).
⚠️ Report is 1 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                65.29%   65.32%   +0.02%     
=======================================================
  Files                      429      429              
  Lines                    26056    26137      +81     
=======================================================
+ Hits                     17014    17073      +59     
- Misses                    9042     9064      +22     

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