CodeRabbit Generated Unit Tests: Add unit tests for PR changes

[coderabbitai]

Unit test generation was requested by @renefloor.

• feat(ui): inline attachment picker #2527 (comment)

The following files were modified:

• packages/stream_chat/test/src/client/channel_delivery_reporter_test.dart
• packages/stream_chat/test/src/client/event_resolvers_test.dart
• packages/stream_chat/test/src/client/key_stroke_handler_test.dart
• packages/stream_chat/test/src/client/retry_policy_test.dart

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