Improve accessibility in "Showcases" and on the player

[MGaetan89]

Pull request

Description

This improves accessibility in the "Showcases" section and on the player.

Changes made

• Adjust PillarboxSlider when TalkBack is enabled, i.e.:
  • Enforce non-compact mode.
  • Add vertical padding.
  • Add progress information.
• Migrate player settings to Material 3 Bottom Sheet (instead of Material Navigation Bottom Sheet). The former provides better accessibility support.
• Remove Gradle cache support in the build_windows.yml workflow. This action differentiates cache by platform, so this was unnecessary since we never store cache for Windows builds.

Checklist

• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).

[github-actions]

Code Coverage

Overall Project	48.65%	🟢

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[StaehliJ]

• We should remove Overlay text from TalkBack.
• TalkBack in French say "2 metres 12" instead of a time.
• The toggle controls text should be more explicite. But it is better than before.
• When double drag in TalkBack, the controls are hide but nothing tells user in has been hidden and nothing tells what to do next.

[MGaetan89]

• Check if we should lower media volume when TalkBack speaks
• Replace the emoji name with the media type
• Replace URN with comment in DemoItem description
• Increase slider height

[MGaetan89]

• We should remove Overlay text from TalkBack.

Done ✅

• TalkBack in French say "2 metres 12" instead of a time.

Changed to speak out the progress in percentage instead ✅

• The toggle controls text should be more explicite. But it is better than before.

Added an accessibility label to describe the state of the controls ("Controls visible"/"Controls hidden") ✅

• When double drag in TalkBack, the controls are hide but nothing tells user in has been hidden and nothing tells what to do next.

I'll look into this tomorrow ⏳
We're using Compose's toggleable Modifier, so accessibility should already be set up properly ✅

• Check if we should lower media volume when TalkBack speaks

I'll look into this tomorrow ⏳

• Replace the emoji name with the media type

Done ✅

• Replace URN with comment in DemoItem description

Done ✅

• Increase slider height

Done ✅

[MGaetan89]

• Check if we should lower media volume when TalkBack speaks

I'll look into this tomorrow ⏳

Android provides dedicated volume settings for TalkBack and Media. Maybe we should just let the user/system handle that, instead of trying to manage it ourselves. What do you think?
https://support.google.com/accessibility/android/answer/6283655?hl=en#:~:text=Change%20the%20volume%20for%20TalkBack