Introduces a new export page for creating and managing bidding lists. Key features include: selecting items from a
master list, adding them to a bidding list, editing start price/remarks, batch price updates, and drag-and-drop
reordering. The final list can be previewed and exported as a CSV. This change adds the `useBiddingItems` composable and
the `sortablejs` dependency. Also refactors `imageUrl` to be a non-nullable string for type consistency.
This commit introduces an optional 'brand' field to the item model, allowing for better organization and
differentiation.
- The Add/Edit modal now includes a form field to select or create a brand.
- The item list on the main page now displays the brand next to the item name.
- Name uniqueness validation is now brand-aware. An item name must be unique within the context of its brand.
- The `addItem` logic is centralized in the `useItemsStore` to handle ID and timestamp generation.
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.
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.
