feat(island): configurable pill order, dragged on a settings page

The pills' x positions were written per pill around a fixed centre gap.
They now come from one pillX() over Prefs.island.pills: the first two
sit left of the screen's centre and the last two right, each a gap past
the visible pills nearer the centre, so a hidden player or OBS pill
leaves no hole and a panel still widens a pill away from the centre.
The default order is the previous layout.

The Island bar group gains a Pills page: four fixed slots with the centre
marked, a pill dragged takes the nearest slot and the others step aside
while it moves. The drag holds the pointer (preventStealing) so the page
does not scroll under it.

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

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