買い物リスト - 履歴や使った金額がわかる簡易家計簿

■Feature List
1. List Screen (Main Screen)
- List of unpurchased items
- Filter function (All/By Priority/By Store/By Category)
- Tap an item to proceed to the edit screen
- Mark items as purchased using the checkbox
- Delete items using the Delete button
2. Purchased Items Screen
- Switch between all, by store, by category, and by month
- Tap an item to display the following menu:
- Edit Data — Proceed to the edit screen
- Purchase Again — Return to unpurchased list (confirmation dialog included)
- Delete — Delete item (confirmation dialog included)
3. Summary Screen
- Switch between monthly and yearly summaries
- Display total amount and total number of items
- Summary by category (number of items and amount)
- Summary by store (number of items and amount)
- Link to Purchase History Screen
4. Purchase History Screen
- Switch between all periods, by month, by year, by store, and by category
- Display number of items and total amount
5. Settings Screen
- Category List View
- Add/Delete Categories
- Export All App Data (Categories, Shopping Items, Purchase History)
- Import Exported Files