The cast glyph showed up both under the volume slider and inside the
visualizer, which was redundant. Dropped the volume-slider indicator
(gui/cast_indicator.py deleted) and made the visualizer panel the single
cast control — the volume slider goes back to sitting on its own, and
nothing shifts position when a session starts.
The panel's glyph is bigger (20 -> 40px) and always painted in the theme
highlight rather than following the brightness mode. Clicking it now stops
casting instead of cycling on/dim/off, which meant nothing when there are
no bars to dim; that click was the useful behavior the volume-slider icon
had, so it moves here rather than being lost.
transport_icon() takes a size and scales the painter, so the bigger glyph
is repainted crisply rather than being a blown-up 20px pixmap; size joins
the cache key. The cast/cast_connected glyph pair collapses into one,
since only the connected state was ever drawn.
450 tests pass.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>