iPhone landscape now uses the floating panel only, always on the right;
the pin and side-toggle buttons on the grabber are gone and the pinned
setting resolves to false on phone.
iPad and macOS default to the pinned side-by-side layout, keep the pin
button to switch to floating, and pick the panel side in the preset's
panel settings instead of an on-screen arrow. The pinned state persists
as a layout preference: closing the player or the hidden default
visibility no longer resets it.
Removes PanelAlignmentButton, the global floatingDetailsPanelSide setting
and its key, FloatingPanelSide.opposite, and the legacy
wideLayoutPanelAlignment preset field.
4210b0ab05