feat: exam actions and data safety fixes

src/modules/textbooks/components/textbook-content-layout.tsx

@@ -40,8 +40,7 @@ export function TextbookContentLayout({ chapters, knowledgePoints, textbookId }:
     if (result.success) {
       toast.success(result.message)
       setIsEditing(false)
-      // Update local state to reflect change immediately (optimistic-like)
-      selectedChapter.content = editContent
+      setSelectedChapter((prev) => (prev ? { ...prev, content: editContent } : prev))
     } else {
       toast.error(result.message)
     }

src/modules/textbooks/components/textbook-form-dialog.tsx

@@ -61,7 +61,7 @@ export function TextbookFormDialog() {
         <DialogHeader>
           <DialogTitle>Add New Textbook</DialogTitle>
           <DialogDescription>
-            Create a new digital textbook. Click save when you're done.
+            Create a new digital textbook. Click save when you&apos;re done.
           </DialogDescription>
         </DialogHeader>
         <form action={handleSubmit}>

src/modules/textbooks/data-access.ts

@@ -65,7 +65,7 @@ let MOCK_KNOWLEDGE_POINTS: KnowledgePoint[] = [
 
 export async function getTextbooks(query?: string, subject?: string, grade?: string): Promise<Textbook[]> {
   await new Promise((resolve) => setTimeout(resolve, 500));
-  let results = [...MOCK_TEXTBOOKS];
+  const results = [...MOCK_TEXTBOOKS];
   // ... (filtering logic)
   return results;
 }