feat(sound): album art as the OSD background

When the current track has art, the volume OSD now draws it across the
whole panel, blurred (MultiEffect blur 0.5, default blurMax) and masked
to the panel's rounded corners, since clip only cuts to the bounding box.
The thumbnail in the track row stays sharp on top.

A dark scrim (Theme.base at 0.82) sits over the art. The palette is dark
and the text light, so a light cover made the panel unreadable, and more
blur did not fix that; only darkening did. The scrim is a sibling of the
MultiEffect, not a child: nested inside it, it did not paint at all, which
is why raising its alpha first appeared to change nothing.

Without art the panel keeps its translucent, compositor-frosted look.

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

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