Move progress bar below controls and improve layout spacing

Fix video player controls and playlist behavior

Fix video player UI: center play/pause, swap buttons, move controls lower, add orientation lock

Address code review comments: deduplicate condition and improve accessibility

Implement all four fixes: loop behavior, center overlay, YouTube autoplay, and music mode admin-only

Update player icons to YouTube style and reorder controls

Apply UI fixes: remove redirect icon, fix volume alignment, move progress bar to bottom

Fix landscape mode video fullscreen and PiP popup button

Fix YouTube URL validation to prevent URL injection attacks

Address code review feedback: fix CSS duplication, improve URL validation and detection

Implement all four player fixes: playlist reorder, fullscreen mobile, PiP, tap-to-pause

Implement features 4-5: PiP and music mode

Implement issues 1-3: default image, message ordering, and admin controls

Initial commit: Web-SyncPlay moved into Streamer