Cycle-count audits with variance metrics

Run location-scoped count sessions that snapshot system quantities, compute live variance, and reconcile stock on completion.

• Snapshot every active variant at a location, then count on a fast, filterable grid.
• Live metrics: counted vs pending, miscounts, shrink units and dollars, accuracy %.
• Counts are totals, not deltas. A count of zero is distinct from uncounted.
• Completing posts an audit movement per varied line, reconciling stock to the count.
• Schedule recurring counts (monthly/yearly) with reminders so nothing slips.