Bug: when scrolling down on recipes page, any operation with
preserveScroll: true would fetch only page 1 data then restore
scroll position to beyond the loaded items, leaving the grid empty.
Fix:
- Remove preserveScroll: true from all 7 must-refresh trigger
paths (filter, search, sort, import, settings reload, sync,
rebuild cache, sidebar folder nav)
- Replace full list refresh with updateSingleItem() for repair
and bulk missing-LoRA download operations
- Update tests to match new scroll-free behavior