This commit introduces the ability to delete items. A new `ItemDeleteModal` component provides a confirmation step
before removal.
- Adds a 'Delete' option to the action menu in the items table.
- Refactors the `useItems` composable to ensure reactivity with `useLocalStorage` by creating new array references on
add/remove operations.
- Renames `AddModal` to `EditModal` to better align with its future role in both adding and editing items.
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