Fix: Prevent duplicate player buttons on video navigation -Added uniq…

[tylerking999]

Fixes #3267 - Duplicate player buttons appearing when navigating between videos

Changes Made

• Added unique IDs to all player buttons (Loop, PiP, Screenshot, Key Scene, Copy Video ID)
• Changed duplicate check from section-scoped to document-scoped
• Each button now checks if it already exists globally before creation

Technical Details

The issue occurred because section.querySelector('.improvedtube-player-button') only searched within the section
element. When YouTube's SPA recreated the section during navigation, the old buttons persisted outside the new
section, causing duplicates.

Solution: Check for existing buttons at the document level using unique IDs instead of class-based section
queries.

Testing

• Tested navigation between multiple videos
• Verified buttons only appear once
• Confirmed all button functionality works correctly

Test plan

• Navigate between different videos
• Verify only one instance of each button appears
• Test all button functionality (Loop, PiP, Screenshot, Key Scene, Copy Video ID)

[rajanarahul93]

Thanks for the fix! @tylerking999 Could you please attach a screenshot or short GIF showing the button behavior before and after your change? That’ll help confirm everything looks and works correctly.