fix: drawer open/close updates UI immediately without refresh

- Return null instead of throwing on 404 for drawer current query
- Sync drawer session ID to null when drawer closes
- Await query invalidation before closing dialog
- Fix unused approvedBy lint error

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/admin/src/components/pos/pos-drawer-dialog.tsx

@@ -43,9 +43,9 @@ export function POSDrawerDialog({ open, onOpenChange, drawer }: POSDrawerDialogP
         locationId: locationId ?? undefined,
         openingBalance: parseFloat(openingBalance) || 0,
       }),
-    onSuccess: (session) => {
+    onSuccess: async (session) => {
       setDrawerSession(session.id)
-      queryClient.invalidateQueries({ queryKey: posKeys.drawer(locationId ?? '') })
+      await queryClient.invalidateQueries({ queryKey: posKeys.drawer(locationId ?? '') })
       toast.success('Drawer opened')
       onOpenChange(false)
     },
@@ -58,9 +58,8 @@ export function POSDrawerDialog({ open, onOpenChange, drawer }: POSDrawerDialogP
         closingBalance: parseFloat(closingBalance) || 0,
         notes: notes || undefined,
       }),
-    onSuccess: (session) => {
+    onSuccess: async (session) => {
       setDrawerSession(null)
-      queryClient.invalidateQueries({ queryKey: posKeys.drawer(locationId ?? '') })
       const overShort = parseFloat(session.overShort ?? '0')
       if (Math.abs(overShort) < 0.01) {
         toast.success('Drawer closed - balanced')
@@ -68,6 +67,7 @@ export function POSDrawerDialog({ open, onOpenChange, drawer }: POSDrawerDialogP
         toast.warning(`Drawer closed - ${overShort > 0 ? 'over' : 'short'} $${Math.abs(overShort).toFixed(2)}`)
       }
       onOpenChange(false)
+      await queryClient.invalidateQueries({ queryKey: posKeys.drawer(locationId ?? '') })
     },
     onError: (err) => toast.error(err.message),
   })