- Delete 2 empty duplicate "Supplemental" collections from bib.sqlite
(ERRVP346 and JK6N2CLM — 0 items each, leftover from Zotero sync)
- Fix export: item_count now shows direct items only (matches what the
filter actually returns), not misleading recursive totals
- Drop collections with 0 direct items from export (they produce empty
results when clicked)
Before: 19 collections, 3x "Supplemental", PFS showing 12429
After: 8 collections, 1x "Supplemental", PFS showing 254