✨ Summary

This PR improves the anime player experience by:

• Making fullscreen mode behavior consistent and predictable.
• Reducing unnecessary rebuilds and listeners related to AniSkip.
• Cleaning up redundant logic and nested widget trees.

✅ Changes

🖥 Fullscreen Mode

• Fullscreen is now toggled only when the player starts playback, not during widget init.

 
⏩ AniSkip Logic

• initAniSkip() only runs when the "Enable AniSkip" setting is true.
• Skip UI is only built if AniSkip is enabled, reducing widget rebuilds.
• Combined multiple ValueListenableBuilder widgets into a single one using _AniSkipPhase, reducing visual complexity and improving maintainability.
• Collapsed multiple position stream listeners into one, centralizing logic for:
  • current position updates
  • AniSkip state
  • subtitle/audio init

 
🧹 Code Cleanup

• Removed redundant imports (2 commits).
• Removed duplicated if conditions (_hasOpeningSkip || _hasEndingSkip).
• Reorganized stream handling and widget building for better performance and readability.

 
🧪 Testing

• Verified fullscreen toggle behavior across:
  • first-time episode load
  • mid-series episode switching
  • exiting playback
• Confirmed AniSkip shows/hides appropriately depending on global setting.
• No regressions in playback, controls, or skip behavior.