feat: add audio skip controls

[TenFinges]

Description

Added 10-second skip forward and backward buttons to the player, positioned next to the play/pause button.

• Implements skipForward/skipBackward logic in ChapterPlayerController.
• Updates UI with accessible buttons.
• Includes localization support.

Fixes #751

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

I manually verified the changes on the iOS Simulator and verified unit tests pass.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

Maintainer Checklist

• closes Audio Skip Controls #751
• Tag the PR with the appropriate labels

[github-actions]

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