Long-press on mobile or the new header toggle on desktop puts
/lists/[id] into multi-select mode. Rows render a checkbox on the left,
the stepper + drag handle go away, and swipes + double-tap are disabled.
Chrome during selection mode
Mobile: header turns into a dark slate-900 action bar with "N selected"
+ Cancel on the left, and a bottom action bar (Delete / Move / Check)
appears above the BottomTabBar. The sticky add-item form is hidden.
Desktop: same dark header with Cancel + inline action icons on the right.
Bulk actions
Delete — one scheduleUndoable with a batch restore (re-inserts all
snapshots) / batch commit (bulkDeleteItems). Single undo toast.
Move — opens a bottom sheet / dialog with the collective's other active
lists + a "Create new list" row that creates an empty list and moves
into it in a single gesture.
Mark checked — flips only the selected unchecked items
(bulkCheckItems with is_checked=false filter), no toggle.
Store helpers (apps/web/src/lib/stores/lists.ts)
bulkDeleteItems(ids) → DELETE .in('id', ids)
bulkMoveItems(ids, newListId) → UPDATE list_id .in('id', ids)
bulkCheckItems(ids, userId) → UPDATE is_checked=true where !is_checked
Entry / exit
Long-press 500 ms on a row enters with that row pre-selected. Movement
cancels the long-press intent so it never fights the swipe.
Single-tap toggles selection while active (instead of invoking the
no-op short-tap / dbltap-overlay path).
Cancel button exits + clears selection.
Tests
apps/web/tests/e2e/selection.test.ts (3 desktop tests)
SEL-01 toggle enters, row click toggles, Cancel exits
SEL-02 bulk delete → row gone + undo toast visible
SEL-03 mark checked → row gains strikethrough
Mobile long-press tests deferred until WebKit install lands (same
reason as the swipe-toggle M-series).
i18n additions
list_select, list_cancel_selection, list_selection_count({n}),
list_bulk_delete/move/mark_checked, list_undo_bulk_delete({n}),
list_move_title, list_move_create_new (en/es).
Verification
just test-e2e → 43 passed + 2 skipped (was 40 + 2).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
