feat(sound): fake frost on the album-art scrim

The art background is opaque, so Hyprland's blur behind the OSD cannot
show through it; making the art translucent to let it through would
also thin the scrim that keeps light covers legible. Fake the frosted
glass instead: a faint top-down sheen in Theme.text and a fixed grain,
painted once by a Canvas and masked to the panel's rounded corners.

The grain is a Canvas rather than a ShaderEffect because a shader needs
a compiled .qsb beside it; the Canvas repaints only on resize.

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

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