CodeRabbit Generated Unit Tests: Add unit tests for PR changes

[coderabbitai]

Unit test generation was requested by @renefloor.

• feat(ui): channel list item #61 (comment)

The following files were modified:

• apps/design_system_gallery/test/app/gallery_app_test.dart
• apps/design_system_gallery/test/app/gallery_shell_test.dart
• apps/design_system_gallery/test/app/home_test.dart
• apps/design_system_gallery/test/config/preview_configuration_test.dart
• apps/design_system_gallery/test/config/theme_configuration_test.dart

[coderabbitai]

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