feat(player): add two-finger subtitle jump gestures and edge swipe isolation

[nutine]

Summary

This pull request introduces gesture-based subtitle navigation and improves edge swipe ergonomics on fullscreen playback:

• Two-Finger Subtitle Sentence Navigation:

  • Two-finger tap: Tap on the left half of the screen to jump to the previous subtitle cue; tap on the right half to jump to the next cue.
  • Two-finger horizontal swipe: Swipe left to jump to the next sentence; swipe right to jump to the previous sentence.
  • Smart Rewind Threshold: If playback is more than 1 second into the active dialogue cue, the previous action rewinds to the beginning of the current cue rather than jumping to the prior one.
  • HUD Feedback: Displays an on-screen preview text banner showing dialogue text snippet (⏮ / ⏭) and provides subtle haptic vibration.

• Edge Swipe & System Bar Isolation:

  • Prevents player gestures (volume, brightness, seek, speedup hold) from accidentally triggering when swiping inward from the status bar or navigation bar to reveal system controls in fullscreen.
  • Fixes landscape touch clamping on devices using 3-button navigation.

Test Plan

• Tested two-finger tap and swipe gestures while playing videos with external and embedded subtitle tracks.
• Tested rewinding to sentence beginning vs prior sentence.
• Tested edge swipes from top and sides without accidental video seek or volume/brightness changes.
• Verified unit tests and clean build pass.