fix(list): shift-click on the checkbox extends the selection (range)

selectRangeEmails was only wired to shift-clicking the row, but the
checkbox handler called stopPropagation and a plain toggle — so shift-
clicking checkboxes (the obvious affordance in selection mode) selected
single messages instead of the range. Make all three checkbox handlers
(email-list-item, thread single-email, thread header) shift-aware:
shift -> selectRangeEmails, otherwise toggle. Adds a regression test.

components/email/__tests__/email-list-item.test.tsx

@@ -121,3 +121,34 @@ describe('EmailListItem tag badge', () => {
     expect(container.querySelector('p')).toBeNull();
   });
 });
+
+describe('EmailListItem shift-range checkbox', () => {
+  beforeEach(() => {
+    useSettingsStore.setState({ emailKeywords: [...DEFAULT_KEYWORDS], showPreview: false, mailLayout: 'split' });
+  });
+
+  it('shift-clicking the checkbox extends the selection from the anchor', () => {
+    const e1 = makeEmail({ id: 'e1', threadId: 't1' });
+    const e2 = makeEmail({ id: 'e2', threadId: 't2' });
+    const e3 = makeEmail({ id: 'e3', threadId: 't3' });
+    // selection mode active (so the checkbox renders), anchor on e1
+    useEmailStore.setState({
+      emails: [e1, e2, e3],
+      selectedEmailIds: new Set(['e1']),
+      lastSelectedEmailId: 'e1',
+      selectedMailbox: 'inbox',
+    });
+
+    render(<EmailListItem email={e3} />);
+    // the checkbox is the first button in the row (shown in selection mode)
+    const checkbox = screen.getAllByRole('button')[0];
+    act(() => {
+      checkbox.dispatchEvent(new MouseEvent('click', { bubbles: true, shiftKey: true }));
+    });
+
+    const sel = useEmailStore.getState().selectedEmailIds;
+    expect(sel.has('e1')).toBe(true);
+    expect(sel.has('e2')).toBe(true); // the in-between row got filled in
+    expect(sel.has('e3')).toBe(true);
+  });
+});

components/email/email-list-item.tsx

@@ -87,7 +87,14 @@ export function EmailListItem({ email, selected, onClick, onDoubleClick, onConte
 
   const handleCheckboxClick = (e: React.MouseEvent) => {
     e.stopPropagation();
-    toggleEmailSelection(email.id);
+    if (e.shiftKey) {
+      // Shift-click extends the selection from the anchor to here, like
+      // shift-clicking the row (the checkbox stops propagation, so the
+      // row's shift handler never runs — replicate it here).
+      selectRangeEmails(email.id);
+    } else {
+      toggleEmailSelection(email.id);
+    }
   };
 
   const handleContextMenu = (e: React.MouseEvent) => {

components/email/thread-list-item.tsx

@@ -134,7 +134,11 @@ const SingleEmailItem = React.forwardRef<HTMLDivElement, SingleEmailItemProps>(
 
     const handleCheckboxClick = (e: React.MouseEvent) => {
       e.stopPropagation();
-      toggleEmailSelection(email.id);
+      if (e.shiftKey) {
+        selectRangeEmails(email.id);
+      } else {
+        toggleEmailSelection(email.id);
+      }
     };
 
     const handleContextMenu = (e: React.MouseEvent) => {
@@ -513,6 +517,10 @@ export const ThreadListItem = React.forwardRef<HTMLDivElement, ThreadListItemPro
 
     const handleThreadCheckboxClick = (e: React.MouseEvent) => {
       e.stopPropagation();
+      if (e.shiftKey) {
+        selectRangeEmails(latestEmail.id);
+        return;
+      }
       // Toggle selection for all emails in this thread
       const allSelected = thread.emails.every(em => selectedEmailIds.has(em.id));
       const newSelection = new Set(selectedEmailIds);