Add a seek bar to the TV demo player

[MGaetan89]

Pull request

Description

This PR adds a seek bar to the player in the TV demo, so it is easier to seek backward/forward in the current media.

Changes made

• Create a TVSlider component.
• Reorganise the PlayerView so it has a clearer structure:
  • The chapter/segment info at the top.
  • The playback actions in the middle.
  • The settings button, skip button, and seek bar at the bottom.

Screenshots

Description	Screenshot
Seek bar unfocused
Seek bar focused
Seek bar disabled
Skip button with controls
Skip button without controls

Checklist

• Your branch has been rebased onto the main branch.
• 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).
• All pull request status checks pass.

[github-actions]

Code Coverage

Overall Project	49.6%	🟢

There is no coverage information present for the Files changed

[StaehliJ]

For a first step it is ok. For long video or audio duration it is tedious. A seek acceleration could be nice in that case.