Disable unavailable packaging filters

src/screens/ActivePickListScreen.tsx

@@ -98,6 +98,9 @@ export const ActivePickListScreen = () => {
     );
   }, [products]);
 
+  const hasCartonItems = useMemo(() => items.some((item) => item.is_carton), [items]);
+  const hasUnitItems = useMemo(() => items.some((item) => !item.is_carton), [items]);
+
   const filteredProducts = useMemo(() => {
     const normalizedQuery = query.trim().toLowerCase();
     if (!normalizedQuery) return sortedProducts;
@@ -121,6 +124,14 @@ export const ActivePickListScreen = () => {
     }
   }, [allItemsPicked, showPicked]);
 
+  useEffect(() => {
+    if (itemFilter === 'cartons' && !hasCartonItems) {
+      setItemFilter(hasUnitItems ? 'units' : 'all');
+    } else if (itemFilter === 'units' && !hasUnitItems) {
+      setItemFilter(hasCartonItems ? 'cartons' : 'all');
+    }
+  }, [itemFilter, hasCartonItems, hasUnitItems]);
+
   const visibleItems = useMemo(() => {
     let filteredItems = showPicked
       ? sortedItems
@@ -311,8 +322,18 @@ export const ActivePickListScreen = () => {
                 sx={{ flexGrow: 1 }}
               >
                 <FormControlLabel value="all" control={<Radio />} label="All" />
-                <FormControlLabel value="cartons" control={<Radio />} label="Cartons" />
-                <FormControlLabel value="units" control={<Radio />} label="Units" />
+                <FormControlLabel
+                  value="cartons"
+                  control={<Radio />}
+                  label="Cartons"
+                  disabled={!hasCartonItems}
+                />
+                <FormControlLabel
+                  value="units"
+                  control={<Radio />}
+                  label="Units"
+                  disabled={!hasUnitItems}
+                />
               </RadioGroup>
               <Stack direction="row" spacing={1} alignItems="center" sx={{ ml: { xs: 0, sm: 2 } }}>
                 <FormControlLabel