fix(client): add selection mode toggle for bulk delete UX

- Add 'Select' toggle button in filter area
- Checkboxes only visible when selection mode is active
- Hide individual trash buttons during selection mode
- Exit selection mode when: deselecting all, deleting, or changing filters
- Resolves visual conflict between checkbox and card title
- Removes redundancy between checkbox and trash button

The checkbox now appears on-demand via toggle, providing cleaner default UI.

client/src/pages/Meetings.tsx

@@ -1,6 +1,6 @@
 // Meetings list page
 
-import { Calendar, Loader2 } from 'lucide-react';
+import { Calendar, Loader2, CheckSquare } from 'lucide-react';
 import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import { useParams } from 'react-router-dom';
 import { getAPI } from '@/api/interface';
@@ -52,6 +52,7 @@ export default function MeetingsPage() {
   const [loadingMore, setLoadingMore] = useState(false);
 
   // Bulk selection state
+  const [isSelectionMode, setIsSelectionMode] = useState(false);
   const [selectedMeetingIds, setSelectedMeetingIds] = useState<Set<string>>(new Set());
   const [showBulkDeleteDialog, setShowBulkDeleteDialog] = useState(false);
   const { mutate: deleteMeetings, isLoading: isDeleting } = useDeleteMeetings();
@@ -117,6 +118,7 @@ export default function MeetingsPage() {
   // Clear selections when filters change
   useEffect(() => {
     setSelectedMeetingIds(new Set());
+    setIsSelectionMode(false);
   }, [searchQuery, stateFilter, projectScope, resolvedProjectId]);
 
   const filteredMeetings = useMemo(
@@ -149,6 +151,14 @@ export default function MeetingsPage() {
 
   const handleDeselectAll = useCallback(() => {
     setSelectedMeetingIds(new Set());
+    setIsSelectionMode(false);
+  }, []);
+
+  const toggleSelectionMode = useCallback(() => {
+    setIsSelectionMode((prev) => {
+      if (prev) setSelectedMeetingIds(new Set());
+      return !prev;
+    });
   }, []);
 
   const handleBulkDelete = useCallback(() => {
@@ -160,6 +170,7 @@ export default function MeetingsPage() {
       onSuccess: () => {
         setSelectedMeetingIds(new Set());
         setShowBulkDeleteDialog(false);
+        setIsSelectionMode(false);
         fetchMeetings(0, false);
       },
     });
@@ -232,6 +243,14 @@ export default function MeetingsPage() {
                 {state}
               </Button>
             ))}
+            <Button
+              variant={isSelectionMode ? 'default' : 'outline'}
+              size="sm"
+              onClick={toggleSelectionMode}
+            >
+              <CheckSquare className="h-4 w-4 mr-1" />
+              Select
+            </Button>
           </div>
         </div>
 
@@ -261,8 +280,8 @@ export default function MeetingsPage() {
                   meeting={meeting}
                   index={i}
                   onDelete={handleDelete}
-                  showDeleteButton
-                  isSelectable={meeting.state !== 'recording'}
+                  showDeleteButton={!isSelectionMode}
+                  isSelectable={isSelectionMode && meeting.state !== 'recording'}
                   isSelected={selectedMeetingIds.has(meeting.id)}
                   onSelect={handleSelect}
                 />