feat(ui): animate attachment picker + close on back press

[Brazol]

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Linear: FLU-430. FLU-414

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Screenshots / Videos

animate.mov

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[codecov]

Codecov Report

❌ Patch coverage is 67.56757% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.31%. Comparing base (cd3cd88) to head (87248b9).

Files with missing lines	Patch %	Lines
...er/lib/src/message_input/stream_message_input.dart	67.56%	12 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                   @@
##           feat/design-refresh    #2588      +/-   ##
=======================================================
- Coverage                65.32%   65.31%   -0.01%     
=======================================================
  Files                      429      429              
  Lines                    26137    26141       +4     
=======================================================
+ Hits                     17073    17075       +2     
- Misses                    9064     9066       +2     

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[renefloor]

When opening the attachment picker the animation is a bit weird. The bottom padding (safe area I guess) is removed first.

Original recording:
https://github.com/user-attachments/assets/acb226b2-7571-4758-9c3d-452de7e1a999

Slow-mo of the recording:
https://github.com/user-attachments/assets/b57297b2-fa09-42a3-ae1d-9ef63338d027