Use startTransition for delete refresh and fix filter updates

- DeleteItemButton now uses startTransition for router.refresh()
- ListDetailView re-applies filters when initialItems changes
- This ensures deleted items disappear after refresh completes
- Transition provides better React 18 concurrent rendering support

components/ListDetailView.tsx

@@ -144,14 +144,10 @@ export default function ListDetailView({
   })
 
   // Update filtered items when initialItems changes (after refresh)
-  useEffect(() => {
-    setFilteredItems(initialItems)
-  }, [initialItems])
-
-  // Apply initial filters on mount
+  // Re-apply filters to the new data
   useEffect(() => {
     handleFiltersCallback(filters)
-  }, []) // Only run on mount
+  }, [initialItems, handleFiltersCallback, filters])
 
   // Determine which items to display
   const displayItems = debouncedQuery.trim() ? searchResults : filteredItems