Two compounding causes:
- CSP img-src fell back to default-src (self), blocking the data: URI
chevron image on all served pages, so no select ever painted it.
- .editor-head select used the background shorthand, wiping the
background-image set by the later select rule.
Chevron stroke is now a per-preset --chevron token (light stroke for
dark presets, dark for light presets) instead of hardcoded #888.
CSP gains img-src 'self' data: so the data-URI icons can load.
fen