Scale the local inventory to 10k+ varieties:
- Render the list with ListView.builder over a flattened header/item model
instead of building every tile upfront.
- Store a small regenerable JPEG thumbnail per photo (schema v14) and use it
for the 48px list avatar; full bytes stay for offer image hosting. Existing
photos are backfilled lazily at startup. Thumbnail is local-only (excluded
from CRDT sync and backups by the JSON codec).
- Add indexes on varieties(is_deleted,is_draft), attachments(parent_type,
parent_id,kind), lots(variety_id) via @TableIndex.
- Debounce watchInventoryView (~250ms) so a burst of table writes triggers one
reload, not seven.
- cacheWidth/cacheHeight on the list avatar decode.
- Scale test raised 3k -> 10k; migration test v13 -> v14.