Inventory Refresh: Faster, And Now Targeted

The Inventory page's refresh got faster on bigger catalogs and picked up two targeted actions to replace the single Refresh button. The general refresh used to do per-row work that ballooned into hundreds of thousands of small operations on larger accounts; it now runs the same recalculation in a small handful of bulk passes, so big accounts pick up correct counts much faster. Alongside that, the refresh dropdown now offers two targeted actions in addition to the full refresh: Recalculate Inventory Levels and Pull Inventory From Integrations. The two halves can be run independently — useful when only one side needs to re-run, or when troubleshooting which step is responsible for a stale number.