fix(exam,result,question): kebab-icon action menus, status change as a picker

Two follow-ups on the dropdown-actions pass:
- All four action menus (exams, results, questions, candidates panel) now
  trigger off a plain three-dot icon button instead of a text 'Actions'
  button with a chevron.
- Exam status change no longer lists all six statuses flat in the dropdown
  (bad UX, looked like six always-visible options). 'Status' is now one
  menu item that opens a small picker modal (current status + a Select +
  Update) rather than the full edit form.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/backoffice/src/app/features/question/pages/QuestionPage/actions.tsx

@@ -1,6 +1,6 @@
-import { Button, Menu } from '@mantine/core';
+import { ActionIcon, Menu } from '@mantine/core';
 import {
-  IconChevronDown,
+  IconDotsVertical,
   IconEdit,
   IconGavel,
   IconSend,
@@ -29,14 +29,14 @@ export function questionActionsColumn(
       return (
         <Menu shadow="md" width={180} position="bottom-end">
           <Menu.Target>
-            <Button
-              size="compact-xs"
-              variant="light"
-              rightSection={<IconChevronDown size={12} />}
+            <ActionIcon
+              variant="subtle"
+              color="gray"
+              size="sm"
               loading={handlers.isSubmittingReview}
             >
-              {t('question.columns.actions', 'Actions')}
-            </Button>
+              <IconDotsVertical size={16} />
+            </ActionIcon>
           </Menu.Target>
           <Menu.Dropdown>
             {(q.status === 'DRAFT' || q.status === 'REJECTED') && (