Convert remaining reachable surfaces to NsIcon (launcher, utilities, windowinfo,
sidebar, dashboard, notification toast, shared controls IconTextButton/Menu/
SplitButton/ToggleButton/CollapsibleSection/CustomSpinBox, CoverArt). Handles
the `sourceComponent: MaterialIcon {` form and icon-via-alias controls.
- IconTextButton: alias -> plain `icon` property + bound NsIcon (cross-file alias
to a custom property was rejected).
- Reverted IconButton `font:` (the controls-wide font->fontStyle sweep wrongly
hit ButtonBase, which uses font not fontStyle).
- Glyphs map: +31 names (dashboard/utilities/launcher leftovers) — no "?" glyphs.
Old collapsed bar + old lock sub-components left as-is (unused, never render).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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