fix xem man hinh:

management/src/components/ExamGridProctor.tsx

@@ -20,6 +20,17 @@ export const ExamGridProctor: React.FC<ExamGridProctorProps> = ({
   const [searchQuery, setSearchQuery] = useState<string>('');
   const [onlyOnline, setOnlyOnline] = useState<boolean>(false);
   const [isFullscreen, setIsFullscreen] = useState<boolean>(false);
+  const [zoomedStudent, setZoomedStudent] = useState<ExamRoomStudent | null>(null);
+
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') {
+        setZoomedStudent(null);
+      }
+    };
+    window.addEventListener('keydown', handleKeyDown);
+    return () => window.removeEventListener('keydown', handleKeyDown);
+  }, []);
 
   const wsRef = useRef<WebSocket | null>(null);
   const subscribedRef = useRef<Set<number>>(new Set());
@@ -31,9 +42,13 @@ export const ExamGridProctor: React.FC<ExamGridProctorProps> = ({
   );
   const onlineKey = useMemo(() => onlineIds.join(','), [onlineIds]);
 
+  const onlineIdsRef = useRef<number[]>(onlineIds);
+  onlineIdsRef.current = onlineIds;
+
   const syncSubscriptions = (ws: WebSocket) => {
     if (ws.readyState !== WebSocket.OPEN) return;
-    const target = new Set(onlineIds);
+    const currentOnlineIds = onlineIdsRef.current;
+    const target = new Set(currentOnlineIds);
     const prev = subscribedRef.current;
 
     prev.forEach((id) => {
@@ -42,7 +57,7 @@ export const ExamGridProctor: React.FC<ExamGridProctorProps> = ({
         prev.delete(id);
       }
     });
-    onlineIds.forEach((id) => {
+    currentOnlineIds.forEach((id) => {
       if (!prev.has(id)) {
         ws.send(JSON.stringify({ event: 'teacher:subscribe', data: { studentId: id, mode: 'grid' } }));
         prev.add(id);
@@ -321,7 +336,14 @@ export const ExamGridProctor: React.FC<ExamGridProctorProps> = ({
 
               <div className="grid-proctor-card-body">
                 {isOnline ? (
-                  <div className="proctor-frame-container">
+                  <div
+                    className="proctor-frame-container cursor-zoom-in"
+                    onClick={(e) => {
+                      e.stopPropagation();
+                      setZoomedStudent(s);
+                    }}
+                    style={{ cursor: 'zoom-in' }}
+                  >
                     {screenFrame ? (
                       <img
                         src={screenFrame}
@@ -389,6 +411,173 @@ export const ExamGridProctor: React.FC<ExamGridProctorProps> = ({
           </div>
         )}
       </div>
+
+      {zoomedStudent && (
+        <div
+          className="zoomed-proctor-overlay"
+          onClick={() => setZoomedStudent(null)}
+          style={{
+            position: 'fixed',
+            top: 0,
+            left: 0,
+            width: '100vw',
+            height: '100vh',
+            backgroundColor: 'rgba(10, 15, 30, 0.85)',
+            backdropFilter: 'blur(8px)',
+            zIndex: 9999,
+            display: 'flex',
+            alignItems: 'center',
+            justifyContent: 'center',
+            padding: '2rem',
+            animation: 'fadeIn 0.2s ease-out',
+          }}
+        >
+          <div
+            className="zoomed-proctor-modal"
+            onClick={(e) => e.stopPropagation()}
+            style={{
+              width: '100%',
+              maxWidth: '1200px',
+              backgroundColor: '#161d2a',
+              border: '1px solid rgba(255, 255, 255, 0.1)',
+              borderRadius: '16px',
+              boxShadow: '0 20px 40px rgba(0, 0, 0, 0.5)',
+              display: 'flex',
+              flexDirection: 'column',
+              maxHeight: '90vh',
+              overflow: 'hidden',
+            }}
+          >
+            {/* Modal Header */}
+            <div
+              style={{
+                display: 'flex',
+                justifyContent: 'space-between',
+                alignItems: 'center',
+                padding: '1rem 1.5rem',
+                borderBottom: '1px solid rgba(255, 255, 255, 0.1)',
+                backgroundColor: '#1c2436',
+              }}
+            >
+              <div style={{ display: 'flex', alignItems: 'center', gap: '12px' }}>
+                <span
+                  style={{
+                    width: '10px',
+                    height: '10px',
+                    borderRadius: '50%',
+                    backgroundColor: onlineIds.includes(zoomedStudent.studentRkId) ? '#10b981' : '#ef4444',
+                    boxShadow: onlineIds.includes(zoomedStudent.studentRkId) ? '0 0 8px #10b981' : 'none',
+                  }}
+                />
+                <h3 style={{ margin: 0, color: '#fff', fontSize: '1.1rem', fontWeight: 600 }}>
+                  {zoomedStudent.fullName}
+                </h3>
+                <span
+                  style={{
+                    fontFamily: 'monospace',
+                    fontSize: '0.85rem',
+                    color: '#8f9cae',
+                    backgroundColor: 'rgba(255, 255, 255, 0.08)',
+                    padding: '2px 8px',
+                    borderRadius: '4px',
+                  }}
+                >
+                  {zoomedStudent.studentCode}
+                </span>
+              </div>
+              <button
+                onClick={() => setZoomedStudent(null)}
+                style={{
+                  background: 'none',
+                  border: 'none',
+                  color: '#8f9cae',
+                  fontSize: '1.5rem',
+                  cursor: 'pointer',
+                  padding: '4px 8px',
+                  lineHeight: 1,
+                  transition: 'color 0.2s',
+                }}
+                onMouseOver={(e) => (e.currentTarget.style.color = '#fff')}
+                onMouseOut={(e) => (e.currentTarget.style.color = '#8f9cae')}
+              >
+                &times;
+              </button>
+            </div>
+
+            {/* Modal Body */}
+            <div
+              style={{
+                flex: 1,
+                padding: '1.5rem',
+                display: 'flex',
+                alignItems: 'center',
+                justifyContent: 'center',
+                backgroundColor: '#0d131f',
+                position: 'relative',
+                minHeight: '400px',
+                overflow: 'hidden',
+              }}
+            >
+              {screenFrames[zoomedStudent.studentRkId] ? (
+                <div style={{ position: 'relative', width: '100%', height: '100%', display: 'flex', justifyContent: 'center', alignItems: 'center' }}>
+                  <img
+                    src={screenFrames[zoomedStudent.studentRkId]}
+                    alt="Zoomed Screen"
+                    style={{
+                      maxWidth: '100%',
+                      maxHeight: '70vh',
+                      objectFit: 'contain',
+                      borderRadius: '8px',
+                      border: '1px solid rgba(255, 255, 255, 0.08)',
+                    }}
+                  />
+                  {showWebcamOverlay && webcamFrames[zoomedStudent.studentRkId] && (
+                    <div
+                      style={{
+                        position: 'absolute',
+                        bottom: '20px',
+                        right: '20px',
+                        width: '240px',
+                        aspectRatio: '4/3',
+                        borderRadius: '8px',
+                        border: '2px solid rgba(255, 255, 255, 0.2)',
+                        boxShadow: '0 8px 16px rgba(0, 0, 0, 0.4)',
+                        overflow: 'hidden',
+                        backgroundColor: '#000',
+                      }}
+                    >
+                      <img
+                        src={webcamFrames[zoomedStudent.studentRkId]}
+                        alt="Zoomed Webcam"
+                        style={{ width: '100%', height: '100%', objectFit: 'cover' }}
+                      />
+                    </div>
+                  )}
+                </div>
+              ) : (
+                <div style={{ color: '#8f9cae', display: 'flex', flexDirection: 'column', alignItems: 'center', gap: '12px' }}>
+                  <div className="sync-spinner" style={{ width: '32px', height: '32px', borderWidth: '3px', marginBottom: '0.5rem' }} />
+                  <span>Đang tải màn hình...</span>
+                </div>
+              )}
+            </div>
+          </div>
+        </div>
+      )}
+
+      <style>{`
+        .cursor-zoom-in {
+          transition: transform 0.2s ease, box-shadow 0.2s ease;
+        }
+        .cursor-zoom-in:hover {
+          transform: scale(1.015);
+          box-shadow: 0 6px 16px rgba(0,0,0,0.3);
+        }
+        @keyframes fadeIn {
+          from { opacity: 0; }
+          to { opacity: 1; }
+        }
+      `}</style>
     </div>
   );
 };