Scan history is now a right-side sheet that layers over the current view
(typically Resources Hub) instead of a full-page activeView branch. The
sheet opens via the existing navigation event, fetches only when open,
dismisses on Escape or overlay click, and preserves the nested scan-details
and scan-compare sheets intact via Radix portal stacking.
The fetch effect now resets selection and page state on active-node change
exactly once, avoiding a double-fetch on node switches.
Scan history fetched a fixed 200 most-recent rows and paginated them
client-side, so older scans silently fell off mature nodes where
baselining is most valuable. The list now fetches one page at a time
via offset, with status=completed and imageRefLike filters applied
server-side. Search input is debounced to avoid per-keystroke fetches.
Anso