Save to Library and Unsave from Library are now mutually exclusive
in both single and multi-select context menus (previously both
showed simultaneously).
Replaced full grid refresh() after save/unsave with targeted dot
updates — save_done signal fires per-post after async save completes
and lights the saved dot on just that thumbnail. Unsave clears the
dot inline. Eliminates the visible flash from grid rebuild.
behavior change: context menus show either Save or Unsave, never
both. Saved dots appear without grid flash.
pax
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