DropZones re-ran the accept predicates and a DOM walk on every overlay
render (pointermove-driven). Matching now runs once per drag via
matchZones(); scroll/resize ticks only re-measure the cached rects (new
test pins the predicate count across ticks).
Refused slots get a diagonal hatch on top of the red tint so the state is
not color-only, slot tags show handles as words (`3d-accessories` ->
"3d accessories", raw key kept in title), and the ghost pop honours
prefers-reduced-motion.
The mock section template now marks its sidebar slot like a real
template, so slot tests use the fixture instead of hand-injected DOM
(the old palette test asserting "no tagged slots" now expects both
sections' slots).
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Co-Authored-By: Codebuff <noreply@codebuff.com>
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