fix ui teacher

management/src/components/ExamRoomWorkspace.tsx

@@ -61,7 +61,6 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
   const [editable, setEditable] = useState(false);
   const [prepEditable, setPrepEditable] = useState(false);
   const [displayStatus, setDisplayStatus] = useState('draft');
-  const canEditApps = displayStatus === 'draft' || displayStatus === 'ready' || displayStatus === 'active';
   const [searchMode, setSearchMode] = useState<'single' | 'bulk'>('single');
   const [bulkInput, setBulkInput] = useState('');
   const [canPublish, setCanPublish] = useState(false);
@@ -96,6 +95,10 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
   const [pdfLoading, setPdfLoading] = useState(false);
   const [inlineResource, setInlineResource] = useState<{ url: string; title: string; isImage: boolean } | null>(null);
 
+  const canEditApps = displayStatus === 'draft' || displayStatus === 'ready' || displayStatus === 'active';
+  const anyPaperSent = students.some((s) => s.paperSentAt);
+  const canModifyPapers = prepEditable || (!anyPaperSent && (displayStatus === 'draft' || displayStatus === 'ready' || displayStatus === 'active'));
+
   const load = useCallback(async () => {
     setLoading(true);
     try {
@@ -727,12 +730,12 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
                 <p className="config-card-desc">
                   Mỗi gói đề gồm <strong>1 file PDF</strong> (đề chính) và <strong>tài nguyên kèm</strong> (ảnh, zip, doc…). Chia ngẫu nhiên sẽ gán cả gói cho từng sinh viên.
                 </p>
-                {!prepEditable && (
+                {!canModifyPapers && (
                   <p className="config-card-desc" style={{ color: 'var(--danger)' }}>
-                    Không thể thêm gói đề — phòng đã khóa hoặc đã tới giờ thi.
+                    Không thể thay đổi gói đề — đề thi đã được gửi cho sinh viên hoặc phòng thi đã kết thúc.
                   </p>
                 )}
-                {prepEditable && (
+                {canModifyPapers && (
                   <div style={{ display: 'flex', flexDirection: 'column', gap: '0.65rem', marginBottom: '0.75rem' }}>
                     <input
                       className="search-input"
@@ -749,7 +752,7 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
                       />
                     </label>
                     <label className="login-field">
-                      <span>Tài nguyên kèm (tùy chọn, nhiều file)</span>
+                      <span>Tài nguyên kèm (tùy chọn, many files)</span>
                       <input
                         type="file"
                         multiple
@@ -800,7 +803,7 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
                             ))
                           )}
                         </ul>
-                        {prepEditable && (
+                        {canModifyPapers && (
                           <div style={{ display: 'flex', gap: '0.35rem', marginTop: '0.5rem', flexWrap: 'wrap' }}>
                             <label className="btn btn-ghost btn-sm" style={{ cursor: 'pointer' }}>
                               + Tài nguyên
@@ -815,7 +818,7 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
                     ))}
                   </div>
                 )}
-                {papers.length > 0 && students.length > 0 && prepEditable && (
+                {papers.length > 0 && students.length > 0 && canModifyPapers && (
                   <button type="button" className="btn btn-secondary" style={{ width: '100%', marginTop: '0.65rem' }} onClick={assignRandomPackages}>
                     Chia gói đề ngẫu nhiên
                   </button>

management/src/components/LearningTab.tsx

@@ -91,7 +91,6 @@ export const LearningTab: React.FC = () => {
   const handleActivateClass = async (cls: ClassItem) => {
     setShowAddClassModal(false);
     try {
-      await apiApplyScheduleTemplate(cls.rkId);
       await apiSaveAllowedApps(cls.rkId, DEFAULT_ALLOWED_APPS);
       await loadActiveClasses();
       handleOpenConfig(cls as ActiveClassItem);
@@ -564,16 +563,16 @@ export const LearningTab: React.FC = () => {
                         borderRadius: 'var(--radius-sm)',
                         transition: 'var(--transition)'
                       }}
-                      onMouseEnter={(e) => {
-                        e.currentTarget.style.borderColor = 'rgba(187, 33, 38, 0.25)';
-                        e.currentTarget.style.backgroundColor = '#fff';
-                        e.currentTarget.style.boxShadow = 'var(--shadow-sm)';
-                      }}
-                      onMouseLeave={(e) => {
-                        e.currentTarget.style.borderColor = 'var(--border-color)';
-                        e.currentTarget.style.backgroundColor = 'var(--bg-app)';
-                        e.currentTarget.style.boxShadow = 'none';
-                      }}
+                        onMouseEnter={(e) => {
+                          e.currentTarget.style.borderColor = 'rgba(187, 33, 38, 0.25)';
+                          e.currentTarget.style.backgroundColor = '#fff';
+                          e.currentTarget.style.boxShadow = 'var(--shadow-sm)';
+                        }}
+                        onMouseLeave={(e) => {
+                          e.currentTarget.style.borderColor = 'var(--border-color)';
+                          e.currentTarget.style.backgroundColor = 'var(--bg-app)';
+                          e.currentTarget.style.boxShadow = 'none';
+                        }}
                       >
                         <div>
                           <div style={{ fontWeight: 700, color: 'var(--text-primary)', fontSize: '0.9rem' }}>{c.classCode}</div>