feat(island): a media pill left of the clock

Shows album art and a scrolling "artist · album · title" while a
player is playing or paused, using the sound module's Player so the
browser proxy duplicates are already filtered. Hovering swaps the text
for a progress bar, swapped in place rather than growing the pill;
MPRIS does not push position, so it is re-read every second while
hovered, and a click seeks only when the player reports canSeek and a
known length. The wheel steps tracks one per notch, as the layout flag
does, so a touchpad does not skip several.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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