feat(lists): drag tasks and list entries onto another list; remember open list and view; live pill in lists

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/storage/lists.go

@@ -444,6 +444,35 @@ func (s *Store) UpdateListItem(itemID string, content *string, category *string,
 	return &it, nil
 }
 
+// MoveListItem moves an item into another list, where it lands at the top like a new entry
+// (content, category, quantity and checked state stay). Permissions are checked by the caller.
+func (s *Store) MoveListItem(itemID, targetListID string) (*domain.ListItem, error) {
+	var sourceListID string
+	if err := s.db.QueryRow(`SELECT list_id FROM list_items WHERE id = ?`, itemID).Scan(&sourceListID); err != nil {
+		return nil, ErrListNotFound
+	}
+	now := domain.NowISO()
+	if _, err := s.db.Exec(`UPDATE list_items SET list_id = ?, sort_order = 0 WHERE id = ?`, targetListID, itemID); err != nil {
+		return nil, err
+	}
+	_, _ = s.db.Exec(`UPDATE lists SET updated_at = ? WHERE id IN (?, ?)`, now, sourceListID, targetListID)
+
+	var it domain.ListItem
+	var dInt int
+	err := s.db.QueryRow(
+		`SELECT li.id, li.list_id, li.content, li.category, li.quantity, li.is_completed, li.completed_by, li.completed_by_name,
+		        li.created_by, COALESCE(u.display_name, ''), li.sort_order, li.created_at, li.completed_at
+		 FROM list_items li LEFT JOIN users u ON u.id = li.created_by AND li.created_by != ''
+		 WHERE li.id = ?`,
+		itemID,
+	).Scan(&it.ID, &it.ListID, &it.Content, &it.Category, &it.Quantity, &dInt, &it.CompletedBy, &it.CompletedByName, &it.CreatedBy, &it.CreatedByName, &it.SortOrder, &it.CreatedAt, &it.CompletedAt)
+	if err != nil {
+		return nil, err
+	}
+	it.IsCompleted = dInt != 0
+	return &it, nil
+}
+
 func (s *Store) DeleteListItem(itemID string) (string, error) {
 	var listID string
 	_ = s.db.QueryRow(`SELECT list_id FROM list_items WHERE id = ?`, itemID).Scan(&listID)