Items can now belong to multiple Square categories and appear in all
matching tabs (e.g. a Mother's Day balloon also shows under Easter).
Also fixes new items not appearing when the Square account has no
"online" category — previously this caused zero items to load; now
it falls back to showing all items.
Changes:
- CatalogItem gains categories[] + categoryLabels[] (multi-category)
- square.ts collects all non-skip categories per item; "online" filter
is now optional (show all if category doesn't exist in Square)
- catalog/route.ts propagates categoryOverride into categories[0]
- FeaturedProducts: tabs and filter use the full categories array
- Admin CategoryDisplayEditor sees all categories from multi-cat items
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
