Add named wish lists for organizing items

[Copilot]

Adds the ability to create named wish lists and organize wish list items into them.

Changes Made

Data Model (src/storage.ts)

• Added WishList interface with id, name, order, and createdDate fields
• Added listId?: string | null to WishItem so items can be associated with a named list
• Added wishLists: WishList[] to AppData
• Bumped DATA_SCHEMA_VERSION to 3 with backward-compatible migration in buildMigratedData
• Added full CRUD methods: getWishLists, addWishList, updateWishList, deleteWishList, reorderWishLists
• Deleting a list moves its items to "Uncategorized" (sets listId to null) rather than deleting them

UI (index.html + src/app.ts)

• Added + Add List button that opens a modal to create or edit a named list
• Added + Add Item button that opens the item modal with a list selector (defaults to Uncategorized)
• Each named list group has its own + Add button (pre-selects that list) and Edit button
• Items are rendered grouped under their list with scoped drag-to-reorder within each group
• An "Uncategorized" group is shown for items that don't belong to any list

Styles (css/styles.css)

• Added card-style group containers with a header bar showing the list name and action buttons

Tests (tests/storage.test.ts)

• Added 9 new unit tests covering all wish list CRUD operations

Screenshots

Empty state:

Populated with named lists:

Testing

• ✅ TypeScript compilation passes
• ✅ All 103 unit tests pass (includes tests from merged main changes)
• ✅ All E2E tests pass
• ✅ Manual UI verification via screenshots
• ✅ Merged main into branch with all conflicts resolved

Original prompt

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This section details on the original issue you should resolve

<issue_title>Organize Wish lists</issue_title>
<issue_description>Users would like the ability to have named wish lists that wish list items can be placed into</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Organize Wish lists #57

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[JoeProgrammer88]

@copilot try again

[Copilot]

@copilot try again

The implementation is complete. Here's a summary of what was built:

• Named wish lists — create/edit/delete named lists via + Add List
• Items belong to lists — when adding/editing an item, choose which list it belongs to (or leave as "Uncategorized")
• Grouped UI — items are displayed grouped under their list, each group has its own + Add and Edit List buttons and scoped drag-to-reorder
• Safe deletion — deleting a list moves its items to "Uncategorized" rather than deleting them
• 9 new unit tests added; all 96 tests pass

Empty state:

Populated with named lists:

[JoeProgrammer88]

@copilot Can you merge main and resolve the conflicts?

[Copilot]

@copilot Can you merge main and resolve the conflicts?

Done — merged main into this branch (commit 9cdf0c2). The only conflicts were in src/storage.ts (initial data defaults) and src/app.ts (import line), both resolved by combining the WishList and ShoppingItem additions from each side. All 103 tests pass after the merge.