- Switched from `create_signal` to a tuple-based signal declaration using `(items_signal, set_items)` for improved clarity.
- Replaced `items.update` with a closure-based update approach for `set_items`.
- Added `Box::new` to `ItemForm`'s `on_submit` to properly handle the function's lifetime and scope.
- Removed unused imports for `leptos_meta` and `leptos_router` to clean up the code.
