Add pull-to-refresh on shopping lists and list detail screens

[Copilot]

Adds pull-to-refresh capability to both the main shopping lists screen and individual list detail screens, allowing users to manually refresh data.

Changes

• Shopping Lists Screen (index.tsx): Wire up refreshing and onRefresh props on FlatList using React Query's isRefetching and refetch
• List Detail Screen (list-detail.tsx): Same pattern for the items FlatList

Implementation

const { data: lists, isLoading, isError, error, refetch, isRefetching } = useShoppingLists();

<FlatList
  testID="shopping-lists-flatlist"
  data={lists}
  refreshing={isRefetching ?? false}
  onRefresh={refetch}
  // ...
/>

Tests (TDD)

Added 4 tests verifying FlatList refresh props are configured and refetch is called on pull gesture.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>there's should be "pull to refresh" action on the shopping lists and individual list screens</issue_title>
<issue_description></issue_description>

<agent_instructions>do this TDD style.</agent_instructions>

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

• Fixes there's should be "pull to refresh" action on the shopping lists and individual list screens #4

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