This commit introduces the capability to edit existing items. The `ItemEditModal` has been refactored to support both creation and editing modes.
- The modal UI (title, buttons) and submission logic now adapt based on whether an item is being added or edited.
- A new `editItem` function is added to the `useItemsStore` to handle the update logic.
- Form validation for the item name is enhanced to correctly check for uniqueness during edits.
- The table's row action menu now opens the modal in edit mode, pre-populating the form.
- The `latestId` generation logic is improved for robustness.
- Additionally, this commit adds row selection checkboxes to the items table.
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