feat(ui): inline attachment picker

[renefloor]

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• The code changes follow best practices
• Code changes are tested (add some information if not applicable)

Description of the pull request

This adds the inline attachment picker.

Required PR: GetStream/stream-core-flutter#66

Screenshots / Videos

Simulator.Screen.Recording.-.iPhone.17.Pro.-.2026-03-05.at.15.19.00.mov

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[codecov]

Codecov Report

❌ Patch coverage is 38.09524% with 104 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (feat/design-refresh@0959f65). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...er/lib/src/message_input/stream_message_input.dart	25.00%	63 Missing ⚠️
...ut/attachment_picker/stream_attachment_picker.dart	67.27%	18 Missing ⚠️
..._view/photo_gallery/stream_photo_gallery_tile.dart	0.00%	15 Missing ⚠️
...age_composer/message_composer_component_props.dart	0.00%	6 Missing ⚠️
...nts/message_composer/message_composer_leading.dart	71.42%	2 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                   @@
##             feat/design-refresh    #2527   +/-   ##
======================================================
  Coverage                       ?   64.63%           
======================================================
  Files                          ?      434           
  Lines                          ?    26351           
  Branches                       ?        0           
======================================================
  Hits                           ?    17031           
  Misses                         ?     9320           
  Partials                       ?        0           

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Note

Unit test generation is a public access feature. Expect some limitations and changes as we gather feedback and continue to improve it.

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Generating unit tests... This may take up to 20 minutes.

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✅ Created PR with unit tests: #2529