The volume/brightness OSD popped out as a rounded caelestia blob in the dynamic
surface colour. Square it + match the design glass:
- osd/Content: draw a flat square Theme.panelBg + 1px border background.
- ContentWindow: osdBg blob deformAmount 0 + radius 0 + opacity 0 (hidden;
the OSD now owns its background).
- FilledSlider: track + handle radius -> 0 (Tokens.rounding.full ignored
rounding.scale, so it stayed round).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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