fix(textbooks): 规范核查修复 — 安全漏洞+功能缺失+i18n+类型安全

安全：createPrerequisiteAction 补充 prerequisiteKpId 归属校验；deletePrerequisiteAction 补充双知识点归属校验，防止跨教材越权。功能：实现图谱添加/删除前置依赖（Dialog + Select 选择知识点 + 调用 Server Action + 自动刷新图谱），替换原 no-op 回调。 i18n：修复 8 处硬编码英文字符串（textbook-reader/chapter-sidebar-list/textbook-card/textbook-form-dialog/textbook-settings-dialog/create-chapter-dialog/teacher-textbook-reader），新增 saveFailed/createFailed/updateFailed/deleteFailed/questionCreatorDefaultContent 等 key。类型安全：graph-prerequisite-edge.tsx 使用 GraphEdgeData 类型经 unknown 安全转换，替代裸 as 断言。规范：analytics.tsx 移动 use client 指令到文件第一行；同步架构文档 005 JSON 类型定义（GraphNodeData/GraphEdgeData/MasteryLevel）。验证：教材模块 lint 零错误、tsc 零错误、193 个单元测试全部通过。
2026-06-23 00:30:14 +08:00
parent 58656da983
commit ec87cd9efa
14 changed files with 388 additions and 104 deletions
--- a/docs/architecture/005_architecture_data.json
+++ b/docs/architecture/005_architecture_data.json
@@ -4508,8 +4508,8 @@
          {
            "name": "GraphNodeData",
            "type": "interface",
-            "definition": "{ id, name, chapterId, chapterTitle, level, questionCount, mastery?: MasteryInfo, isHighlighted?, isRelated?, searchText? } & Record<string, unknown>",
-            "purpose": "Task 9 新增：React Flow 自定义节点数据（含索引签名满足 React Flow 约束）",
+            "definition": "{ kp: KpWithRelations, mastery: MasteryInfo | null, viewMode: GraphViewMode, isSelected: boolean, isHighlighted: boolean, chapterColor: string }",
+            "purpose": "Task 9 新增：React Flow 自定义节点数据（传递给 graph-kp-node 组件）",
            "usedBy": [
              "components/graph-kp-node.tsx",
              "components/knowledge-graph.tsx"
@@ -4518,7 +4518,7 @@
          {
            "name": "GraphEdgeData",
            "type": "interface",
-            "definition": "{ edgeType: 'parent-child' | 'prerequisite', isHighlighted? } & Record<string, unknown>",
+            "definition": "{ edgeType: 'parent' | 'prerequisite', isHighlighted: boolean }",
            "purpose": "Task 9 新增：React Flow 自定义边数据",
            "usedBy": [
              "components/graph-prerequisite-edge.tsx",
@@ -4528,8 +4528,8 @@
          {
            "name": "MasteryLevel",
            "type": "type",
-            "definition": "'unknown' | 'weak' | 'fair' | 'strong'",
-            "purpose": "Task 9 新增：掌握度等级（红/黄/灰）",
+            "definition": "'low' | 'medium' | 'high' | 'unassessed'",
+            "purpose": "Task 9 新增：掌握度等级（红/黄/绿/灰）",
            "usedBy": [
              "components/graph-kp-node.tsx"
            ]
@@ -13694,8 +13694,12 @@
      "algorithms": {
        "sm2": {
          "name": "SM-2 间隔重复算法（简化版）",
-          "description": "4 级评级（again/hard/good/easy），间隔 1/2/4/7 天起，指数增长（×1.2/×1.5/×2），连续 3 次答对标记为已掌握",
-          "functions": ["calculateNewInterval", "calculateNewMastery", "deriveStatus", "calculateNextReviewAt"]
+          "file": "sm2-algorithm.ts",
+          "description": "独立纯函数模块，4 级评级（again/hard/good/easy），间隔 1/2/4/7 天起，指数增长（×1.2/×1.5/×2），连续 3 次答对标记为已掌握。支持时间注入便于测试。",
+          "functions": ["calculateNewInterval", "calculateNewMastery", "deriveStatus", "calculateNextReviewAt", "calculateNewCorrectStreak", "calculateSm2Result"],
+          "constants": ["REVIEW_INTERVALS", "INTERVAL_MULTIPLIERS", "MAX_MASTERY_LEVEL", "MIN_MASTERY_LEVEL", "MASTERED_REQUIRED_STREAK", "MASTERED_REQUIRED_MASTERY"],
+          "testFile": "sm2-algorithm.test.ts",
+          "testCount": 39
        }
      },
      "dataScope": {
--- a/src/modules/textbooks/actions.ts
+++ b/src/modules/textbooks/actions.ts
@@ -426,7 +426,7 @@ export async function createPrerequisiteAction(
            return { success: false, message: t("invalidInput") };
        }

-        // 归属校验
+        // 归属校验：两个知识点都必须属于当前教材，防止跨教材越权
        const kpBelongs = await verifyKnowledgePointBelongsToTextbook(
            parsed.data.knowledgePointId,
            textbookId,
@@ -434,6 +434,13 @@ export async function createPrerequisiteAction(
        if (!kpBelongs) {
            return { success: false, message: t("kpNotBelong") };
        }
+        const prereqBelongs = await verifyKnowledgePointBelongsToTextbook(
+            parsed.data.prerequisiteKpId,
+            textbookId,
+        );
+        if (!prereqBelongs) {
+            return { success: false, message: t("kpNotBelong") };
+        }

        // 循环检测
        const existingEdges = await getPrerequisiteEdgesForTextbook(textbookId);
@@ -475,6 +482,22 @@ export async function deletePrerequisiteAction(
            return { success: false, message: t("invalidInput") };
        }

+        // 归属校验：防止跨教材越权删除前置依赖
+        const kpBelongs = await verifyKnowledgePointBelongsToTextbook(
+            parsed.data.knowledgePointId,
+            textbookId,
+        );
+        if (!kpBelongs) {
+            return { success: false, message: t("kpNotBelong") };
+        }
+        const prereqBelongs = await verifyKnowledgePointBelongsToTextbook(
+            parsed.data.prerequisiteKpId,
+            textbookId,
+        );
+        if (!prereqBelongs) {
+            return { success: false, message: t("kpNotBelong") };
+        }
+
        await deletePrerequisite(parsed.data);
        revalidatePath(`/teacher/textbooks/${textbookId}`);
        return { success: true, message: t("prerequisiteDeleted") };
--- a/src/modules/textbooks/analytics.tsx
+++ b/src/modules/textbooks/analytics.tsx
@@ -1,3 +1,5 @@
+"use client"
+
 /**
 * 教材模块埋点接口（预留）。
 *
@@ -5,8 +7,6 @@
 * 通过 React Context 注入，组件内调用 `useTextbookAnalytics()` 获取。
 */

-"use client"
-
 import { createContext, useContext, type ReactNode } from "react"

 export interface TextbookAnalytics {
--- a/src/modules/textbooks/components/chapter-sidebar-list.tsx
+++ b/src/modules/textbooks/components/chapter-sidebar-list.tsx
@@ -3,6 +3,7 @@
 import { useState } from "react"
 import { ChevronRight, FileText, Folder, Plus, Trash2, GripVertical } from "lucide-react"
 import { toast } from "sonner"
+import { useTranslations } from "next-intl"
 import { DndContext, closestCenter, KeyboardSensor, PointerSensor, useSensor, useSensors, DragEndEvent } from "@dnd-kit/core"
 import { SortableContext, sortableKeyboardCoordinates, verticalListSortingStrategy, useSortable } from "@dnd-kit/sortable"
 import { CSS } from "@dnd-kit/utilities"
@@ -26,6 +27,7 @@ import {
 import { cn } from "@/shared/lib/utils"
 import { CreateChapterDialog } from "./create-chapter-dialog"
 import { deleteChapterAction, reorderChaptersAction } from "../actions"
+import { findChapterParent } from "../utils"

 interface SortableChapterItemProps {
  chapter: Chapter
@@ -39,6 +41,7 @@ interface SortableChapterItemProps {
 }

 function SortableChapterItem({ chapter, level, selectedId, onSelect, textbookId, onDelete, onCreateSub, canEdit = true }: SortableChapterItemProps) {
+  const t = useTranslations("textbooks")
  const [isOpen, setIsOpen] = useState(level === 0)
  const hasChildren = chapter.children && chapter.children.length > 0
  const isSelected = chapter.id === selectedId
@@ -68,7 +71,7 @@ function SortableChapterItem({ chapter, level, selectedId, onSelect, textbookId,
            isDragging && "opacity-50"
        )}>
          {canEdit && (
-            <div {...attributes} {...listeners} className="mr-1 cursor-grab opacity-0 group-hover:opacity-100 transition-opacity p-1 hover:bg-muted rounded">
+            <div {...attributes} {...listeners} className="mr-1 cursor-grab opacity-0 group-hover:opacity-100 transition-opacity p-1 hover:bg-muted rounded" aria-label={t("dialog.chapter.dragHandle")}>
               <GripVertical className="h-3.5 w-3.5 text-muted-foreground/50" />
            </div>
          )}
@@ -87,7 +90,7 @@ function SortableChapterItem({ chapter, level, selectedId, onSelect, textbookId,
                    isOpen && "rotate-90"
                  )}
                />
-                <span className="sr-only">Toggle</span>
+                <span className="sr-only">{t("dialog.chapter.toggle")}</span>
              </Button>
            </CollapsibleTrigger>
          ) : (
@@ -115,7 +118,7 @@ function SortableChapterItem({ chapter, level, selectedId, onSelect, textbookId,
                  e.stopPropagation()
                  onCreateSub(chapter.id)
                }}
-                title="Add Subchapter"
+                aria-label={t("dialog.chapter.addSubchapter")}
              >
                <Plus className="h-3.5 w-3.5" />
              </Button>
@@ -127,7 +130,7 @@ function SortableChapterItem({ chapter, level, selectedId, onSelect, textbookId,
                  e.stopPropagation()
                  onDelete(chapter)
                }}
-                title="Delete Chapter"
+                aria-label={t("dialog.chapter.delete")}
              >
                <Trash2 className="h-3.5 w-3.5" />
              </Button>
@@ -193,6 +196,7 @@ interface ChapterSidebarListProps {
 }

 export function ChapterSidebarList({ chapters, selectedChapterId, onSelectChapter, textbookId, canEdit = true }: ChapterSidebarListProps) {
+  const t = useTranslations("textbooks")
  const [showCreateDialog, setShowCreateDialog] = useState(false)
  const [createParentId, setCreateParentId] = useState<string | undefined>(undefined)

@@ -209,32 +213,8 @@ export function ChapterSidebarList({ chapters, selectedChapterId, onSelectChapte
      const { active, over } = event
      if (!over || active.id === over.id) return

-      // Find which list the items belong to
-      // Since we only support sibling reordering for now, we assume active and over are in the same list
-      // We need a helper to find the parent of an item in the tree
-      const findParent = (items: Chapter[], id: string): Chapter | null => {
-          for (const item of items) {
-              if (item.children?.some(c => c.id === id)) return item
-              if (item.children) {
-                  const found = findParent(item.children, id)
-                  if (found) return found
-              }
-          }
-          return null
-      }
-
-      const activeParent = findParent(chapters, active.id as string)
-      
-      // If parents don't match (and neither is root), we can't reorder easily in this simplified version
-      // But actually, we need to check if they are in the same list.
-      // If both are root items (activeParent is null), they are siblings.
-      
-      // Simplified logic: We trust dnd-kit's SortableContext to only allow valid drops if we restricted it?
-      // No, dnd-kit allows dropping anywhere by default unless restricted.
-      
-      // We need to find the list that contains the 'active' item
-      // And the list that contains the 'over' item.
-      // If they are the same list, we reorder.
+      // v2-P2: 复用 utils.ts 的 findChapterParent，消除重复代码
+      const activeParent = findChapterParent(chapters, String(active.id))

      let activeList: Chapter[] = chapters
      let activeParentId: string | null = null
@@ -254,28 +234,43 @@ export function ChapterSidebarList({ chapters, selectedChapterId, onSelectChapte
      if (activeList.some(c => c.id === over.id)) {
          const newIndex = activeList.findIndex((item) => item.id === over.id)

-          await reorderChaptersAction(active.id as string, newIndex, activeParentId, textbookId)
-          toast.success("Order updated")
+          try {
+              const result = await reorderChaptersAction(String(active.id), newIndex, activeParentId, textbookId)
+              if (result.success) {
+                  toast.success(t("dialog.chapter.orderUpdated"))
+              } else {
+                  toast.error(result.message || t("dialog.chapter.orderUpdated"))
+              }
+          } catch (e) {
+              console.error("Failed to reorder chapters", e)
+              toast.error(t("dialog.chapter.orderUpdated"))
+          }
      }
  }

  const handleDelete = async () => {
    if (!deleteTarget) return
    setIsDeleting(true)
-    const res = await deleteChapterAction(deleteTarget.id, textbookId)
-    setIsDeleting(false)
-    if (res.success) {
-      toast.success(res.message)
-      setShowDeleteDialog(false)
-      setDeleteTarget(null)
-    } else {
-      toast.error(res.message)
+    try {
+      const res = await deleteChapterAction(deleteTarget.id, textbookId)
+      if (res.success) {
+        toast.success(res.message)
+        setShowDeleteDialog(false)
+        setDeleteTarget(null)
+      } else {
+        toast.error(res.message)
+      }
+    } catch (e) {
+      console.error("Failed to delete chapter", e)
+      toast.error(t("reader.deleteFailed"))
+    } finally {
+      setIsDeleting(false)
    }
  }

  const handleDeleteRequest = (chapter: Chapter) => {
      if (chapter.children && chapter.children.length > 0) {
-          toast.error("Cannot delete chapter with subchapters")
+          toast.error(t("dialog.chapter.cannotDeleteWithSubchapters"))
          return
      }
      setDeleteTarget(chapter)
@@ -313,7 +308,7 @@ export function ChapterSidebarList({ chapters, selectedChapterId, onSelectChapte
            textbookId={textbookId}
            onDelete={handleDeleteRequest}
            onCreateSub={handleCreateSubRequest}
-            canEdit={true}
+            canEdit={canEdit}
        />

        <CreateChapterDialog 
@@ -329,16 +324,15 @@ export function ChapterSidebarList({ chapters, selectedChapterId, onSelectChapte
        <AlertDialog open={showDeleteDialog} onOpenChange={setShowDeleteDialog}>
            <AlertDialogContent>
            <AlertDialogHeader>
-                <AlertDialogTitle>Delete Chapter?</AlertDialogTitle>
+                <AlertDialogTitle>{t("dialog.chapter.deleteTitle")}</AlertDialogTitle>
                <AlertDialogDescription>
-                This will permanently delete <span className="font-medium text-foreground">{deleteTarget?.title}</span>.
-                This action cannot be undone.
+                {t("dialog.chapter.deleteDesc", { title: deleteTarget?.title ?? "" })}
                </AlertDialogDescription>
            </AlertDialogHeader>
            <AlertDialogFooter>
-                <AlertDialogCancel>Cancel</AlertDialogCancel>
+                <AlertDialogCancel>{t("dialog.chapter.cancel")}</AlertDialogCancel>
                <AlertDialogAction onClick={handleDelete} className="bg-destructive text-destructive-foreground hover:bg-destructive/90" disabled={isDeleting}>
-                {isDeleting ? "Deleting..." : "Delete"}
+                {isDeleting ? t("dialog.chapter.deleting") : t("dialog.chapter.delete")}
                </AlertDialogAction>
            </AlertDialogFooter>
            </AlertDialogContent>
--- a/src/modules/textbooks/components/create-chapter-dialog.tsx
+++ b/src/modules/textbooks/components/create-chapter-dialog.tsx
@@ -50,12 +50,17 @@ export function CreateChapterDialog({
  const setOpen = onOpenChange ?? setUncontrolledOpen

  const handleSubmit = async (formData: FormData) => {
-    const result = await createChapterAction(textbookId, parentId, null, formData)
-    if (result.success) {
-      toast.success(result.message)
-      setOpen(false)
-    } else {
-      toast.error(result.message)
+    try {
+      const result = await createChapterAction(textbookId, parentId, null, formData)
+      if (result.success) {
+        toast.success(result.message)
+        setOpen(false)
+      } else {
+        toast.error(result.message)
+      }
+    } catch (e) {
+      console.error("Failed to create chapter", e)
+      toast.error(t("reader.createFailed"))
    }
  }

--- a/src/modules/textbooks/components/graph-prerequisite-edge.tsx
+++ b/src/modules/textbooks/components/graph-prerequisite-edge.tsx
@@ -3,6 +3,7 @@
 import { memo } from "react"
 import { BaseEdge, getSmoothStepPath, type EdgeProps } from "@xyflow/react"
 import { cn } from "@/shared/lib/utils"
+import type { GraphEdgeData } from "../types"

 function GraphPrerequisiteEdgeComponent({
  id,
@@ -23,7 +24,9 @@ function GraphPrerequisiteEdgeComponent({
    targetPosition,
  })

-  const isHighlighted = (data as { isHighlighted?: boolean } | undefined)?.isHighlighted ?? false
+  // EdgeProps.data 类型为 Record<string, unknown>，经 unknown 安全转换读取 GraphEdgeData
+  const edgeData = data as unknown as GraphEdgeData | undefined
+  const isHighlighted = edgeData?.isHighlighted ?? false

  return (
    <BaseEdge
--- a/src/modules/textbooks/components/knowledge-graph.tsx
+++ b/src/modules/textbooks/components/knowledge-graph.tsx
@@ -14,13 +14,34 @@ import {
 } from "@xyflow/react"
 import "@xyflow/react/dist/style.css"
 import { useTranslations } from "next-intl"
+import { toast } from "sonner"
 import { Share2 } from "lucide-react"
 import { usePermission } from "@/shared/hooks/use-permission"
 import { Permissions } from "@/shared/types/permissions"
 import { EmptyState } from "@/shared/components/ui/empty-state"
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/shared/components/ui/select"
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "@/shared/components/ui/dialog"
+import { Button } from "@/shared/components/ui/button"
 import type { GraphViewMode, GraphNodeData } from "../types"
 import { computeGraphLayout } from "../graph-layout"
 import { useGraphData } from "../hooks/use-graph-data"
+import {
+  createPrerequisiteAction,
+  deletePrerequisiteAction,
+} from "../actions"
 import { GraphKpNode } from "./graph-kp-node"
 import { GraphPrerequisiteEdge } from "./graph-prerequisite-edge"
 import { GraphToolbar } from "./graph-toolbar"
@@ -51,8 +72,12 @@ function KnowledgeGraphInner({ textbookId, initialViewMode = "structure" }: Know
  const [viewMode, setViewMode] = useState<GraphViewMode>(initialViewMode)
  const [searchText, setSearchText] = useState("")
  const [selectedKpId, setSelectedKpId] = useState<string | null>(null)
+  // 添加前置依赖对话框状态
+  const [addPrereqOpen, setAddPrereqOpen] = useState(false)
+  const [newPrereqId, setNewPrereqId] = useState<string>("")
+  const [isSavingPrereq, setIsSavingPrereq] = useState(false)

-  const { data, isLoading, error } = useGraphData(textbookId, viewMode)
+  const { data, isLoading, error, reload } = useGraphData(textbookId, viewMode)

  const availableViewModes: GraphViewMode[] = isTeacher
    ? ["structure", "class-mastery"]
@@ -173,6 +198,51 @@ function KnowledgeGraphInner({ textbookId, initialViewMode = "structure" }: Know
    reactFlow.fitView({ nodes: [{ id: kpId }], duration: 300 })
  }, [reactFlow])

+  // 添加前置依赖
+  const handleAddPrerequisite = useCallback(async () => {
+    if (!selectedKpId || !newPrereqId || !textbookId) return
+    setIsSavingPrereq(true)
+    const formData = new FormData()
+    formData.set("knowledgePointId", selectedKpId)
+    formData.set("prerequisiteKpId", newPrereqId)
+    formData.set("textbookId", textbookId)
+    const result = await createPrerequisiteAction(formData)
+    setIsSavingPrereq(false)
+    if (result.success) {
+      toast.success(t("graph.detail.prerequisiteAdded"))
+      setAddPrereqOpen(false)
+      setNewPrereqId("")
+      reload()
+    } else {
+      toast.error(result.message)
+    }
+  }, [selectedKpId, newPrereqId, textbookId, t, reload])
+
+  // 删除前置依赖
+  const handleRemovePrerequisite = useCallback(async (prereqId: string) => {
+    if (!selectedKpId || !textbookId) return
+    const formData = new FormData()
+    formData.set("knowledgePointId", selectedKpId)
+    formData.set("prerequisiteKpId", prereqId)
+    formData.set("textbookId", textbookId)
+    const result = await deletePrerequisiteAction(formData)
+    if (result.success) {
+      toast.success(t("graph.detail.prerequisiteRemoved"))
+      reload()
+    } else {
+      toast.error(result.message)
+    }
+  }, [selectedKpId, textbookId, t, reload])
+
+  // 可选的前置知识点（排除自身和已是前置的）
+  const availablePrereqs = useMemo(() => {
+    if (!data || !selectedKpId) return []
+    const existing = new Set(data.knowledgePoints.find((kp) => kp.id === selectedKpId)?.prerequisiteIds ?? [])
+    return data.knowledgePoints.filter((kp) =>
+      kp.id !== selectedKpId && !existing.has(kp.id),
+    )
+  }, [data, selectedKpId])
+
  if (isLoading && !data) {
    return (
      <div className="h-full flex items-center justify-center text-sm text-muted-foreground">
@@ -255,15 +325,44 @@ function KnowledgeGraphInner({ textbookId, initialViewMode = "structure" }: Know
            textbookId={textbookId}
            onClose={() => setSelectedKpId(null)}
            onJumpToKp={onJumpToKp}
-            onAddPrerequisite={() => {
-              // 后续迭代：打开添加前置对话框
-            }}
-            onRemovePrerequisite={(_prereqId: string) => {
-              // 后续迭代：调用 deletePrerequisiteAction
-            }}
+            onAddPrerequisite={() => setAddPrereqOpen(true)}
+            onRemovePrerequisite={handleRemovePrerequisite}
          />
        </div>
      )}
+
+      {/* 添加前置依赖对话框 */}
+      <Dialog open={addPrereqOpen} onOpenChange={setAddPrereqOpen}>
+        <DialogContent>
+          <DialogHeader>
+            <DialogTitle>{t("graph.detail.addPrerequisiteTitle")}</DialogTitle>
+            <DialogDescription>{t("graph.detail.addPrerequisiteDesc")}</DialogDescription>
+          </DialogHeader>
+          <Select value={newPrereqId} onValueChange={setNewPrereqId}>
+            <SelectTrigger>
+              <SelectValue placeholder={t("graph.detail.selectPrerequisite")} />
+            </SelectTrigger>
+            <SelectContent>
+              {availablePrereqs.map((kp) => (
+                <SelectItem key={kp.id} value={kp.id}>
+                  {kp.name}
+                </SelectItem>
+              ))}
+            </SelectContent>
+          </Select>
+          <DialogFooter>
+            <Button variant="outline" onClick={() => setAddPrereqOpen(false)}>
+              {t("graph.detail.cancel")}
+            </Button>
+            <Button
+              onClick={handleAddPrerequisite}
+              disabled={!newPrereqId || isSavingPrereq}
+            >
+              {isSavingPrereq ? t("graph.detail.saving") : t("graph.detail.confirm")}
+            </Button>
+          </DialogFooter>
+        </DialogContent>
+      </Dialog>
    </div>
  )
 }
--- a/src/modules/textbooks/components/teacher-textbook-reader.tsx
+++ b/src/modules/textbooks/components/teacher-textbook-reader.tsx
@@ -0,0 +1,50 @@
+"use client"
+
+import type { ReactNode } from "react"
+import { useTranslations } from "next-intl"
+import { TextbookReader, type TextbookReaderProps } from "./textbook-reader"
+import { CreateQuestionDialog } from "@/modules/questions/components/create-question-dialog"
+import type { KnowledgePoint } from "../types"
+
+/**
+ * 教师端 TextbookReader 包装组件。
+ *
+ * 教师详情页是 Server Component，不能直接向 Client Component（TextbookReader）
+ * 传递函数 prop（renderQuestionCreator）。此包装组件在客户端层组装
+ * renderQuestionCreator，避免违反 Next.js App Router 的 Server→Client 序列化约束。
+ */
+export function TeacherTextbookReader({
+  chapters,
+  textbookId,
+}: {
+  chapters: TextbookReaderProps["chapters"]
+  textbookId: string
+}) {
+  const t = useTranslations("textbooks")
+  const renderQuestionCreator: TextbookReaderProps["renderQuestionCreator"] = ({
+    open,
+    onOpenChange,
+    targetKp,
+  }: {
+    open: boolean
+    onOpenChange: (open: boolean) => void
+    targetKp: KnowledgePoint | null
+  }): ReactNode => (
+    <CreateQuestionDialog
+      open={open}
+      onOpenChange={onOpenChange}
+      defaultKnowledgePointIds={targetKp ? [targetKp.id] : []}
+      defaultContent={targetKp ? t("reader.questionCreatorDefaultContent", { name: targetKp.name }) : ""}
+      defaultType="text"
+    />
+  )
+
+  return (
+    <TextbookReader
+      key={textbookId}
+      chapters={chapters}
+      textbookId={textbookId}
+      renderQuestionCreator={renderQuestionCreator}
+    />
+  )
+}
--- a/src/modules/textbooks/components/textbook-card.tsx
+++ b/src/modules/textbooks/components/textbook-card.tsx
@@ -1,6 +1,8 @@
 "use client"

+import { useState } from "react"
 import Link from "next/link"
+import { useRouter } from "next/navigation"
 import { useTranslations } from "next-intl"
 import { Book, MoreVertical, Edit, Trash2, BookOpen, GraduationCap, Building2 } from "lucide-react"
 import {
@@ -17,9 +19,21 @@ import {
  DropdownMenuItem,
  DropdownMenuTrigger,
 } from "@/shared/components/ui/dropdown-menu"
+import {
+  AlertDialog,
+  AlertDialogAction,
+  AlertDialogCancel,
+  AlertDialogContent,
+  AlertDialogDescription,
+  AlertDialogFooter,
+  AlertDialogHeader,
+  AlertDialogTitle,
+} from "@/shared/components/ui/alert-dialog"
 import { cn, formatDate } from "@/shared/lib/utils"
 import type { Textbook } from "../types"
-import { getSubjectColor } from "../constants"
+import { getSubjectColor, getSubjectLabelKey, getGradeLabelKey } from "../constants"
+import { deleteTextbookAction } from "../actions"
+import { toast } from "sonner"

 interface TextbookCardProps {
  textbook: Textbook
@@ -29,8 +43,30 @@ interface TextbookCardProps {

 export function TextbookCard({ textbook, hrefBase, hideActions }: TextbookCardProps) {
  const t = useTranslations("textbooks")
+  const router = useRouter()
  const base = hrefBase || "/teacher/textbooks"
  const colorClass = getSubjectColor(textbook.subject)
+  const [showDeleteDialog, setShowDeleteDialog] = useState(false)
+  const [isDeleting, setIsDeleting] = useState(false)
+
+  const handleDelete = async () => {
+    setIsDeleting(true)
+    try {
+      const result = await deleteTextbookAction(textbook.id)
+      if (result.success) {
+        toast.success(result.message)
+        router.refresh()
+      } else {
+        toast.error(result.message)
+      }
+    } catch (e) {
+      console.error("Failed to delete textbook", e)
+      toast.error(t("reader.deleteFailed"))
+    } finally {
+      setIsDeleting(false)
+      setShowDeleteDialog(false)
+    }
+  }

  return (
    <Card className="group flex flex-col h-full overflow-hidden border-border/60 transition-all duration-300 hover:shadow-md hover:border-primary/50">
@@ -38,14 +74,14 @@ export function TextbookCard({ textbook, hrefBase, hideActions }: TextbookCardPr
        <div className={cn("relative h-32 w-full overflow-hidden p-5", colorClass)}>
          <div className="relative z-10 flex h-full flex-col justify-between">
            <Badge variant="secondary" className="w-fit bg-background/80 border border-border/60 shadow-sm">
-              {textbook.subject}
+              {t(`subject.${getSubjectLabelKey(textbook.subject)}`)}
            </Badge>
            <div className="flex items-center gap-2">
              <div className="flex h-10 w-10 items-center justify-center rounded-xl bg-background text-foreground shadow-sm ring-1 ring-border/60">
                <Book className="h-5 w-5" />
              </div>
              <div className="text-xs font-medium text-foreground/70">
-                {textbook.grade || t("card.gradeNA")}
+                {textbook.grade ? t(`grade.${getGradeLabelKey(textbook.grade)}`) : t("card.gradeNA")}
              </div>
            </div>
          </div>
@@ -63,7 +99,7 @@ export function TextbookCard({ textbook, hrefBase, hideActions }: TextbookCardPr
          <div className="flex flex-wrap gap-y-1 gap-x-4 text-xs text-muted-foreground">
            <div className="flex items-center gap-1.5">
              <GraduationCap className="h-3.5 w-3.5" />
-              <span>{textbook.grade || t("card.gradeNA")}</span>
+              <span>{textbook.grade ? t(`grade.${getGradeLabelKey(textbook.grade)}`) : t("card.gradeNA")}</span>
            </div>
            <div className="flex items-center gap-1.5">
              <Building2 className="h-3.5 w-3.5" />
@@ -86,7 +122,7 @@ export function TextbookCard({ textbook, hrefBase, hideActions }: TextbookCardPr
        </div>

        <div className="flex items-center gap-1">
-          <span className="text-[10px] text-muted-foreground/60 mr-2">
+          <span className="text-xs text-muted-foreground/60 mr-2">
            {t("card.updated")} {formatDate(textbook.updatedAt)}
          </span>
          {!hideActions && (
@@ -104,7 +140,10 @@ export function TextbookCard({ textbook, hrefBase, hideActions }: TextbookCardPr
                    {t("card.editContent")}
                  </Link>
                </DropdownMenuItem>
-                <DropdownMenuItem className="text-destructive focus:text-destructive">
+                <DropdownMenuItem
+                  className="text-destructive focus:text-destructive"
+                  onClick={() => setShowDeleteDialog(true)}
+                >
                  <Trash2 className="mr-2 h-4 w-4" />
                  {t("card.delete")}
                </DropdownMenuItem>
@@ -113,6 +152,30 @@ export function TextbookCard({ textbook, hrefBase, hideActions }: TextbookCardPr
          )}
        </div>
      </CardFooter>
+
+      <AlertDialog open={showDeleteDialog} onOpenChange={setShowDeleteDialog}>
+        <AlertDialogContent>
+          <AlertDialogHeader>
+            <AlertDialogTitle>{t("dialog.settings.deleteConfirmTitle")}</AlertDialogTitle>
+            <AlertDialogDescription>
+              {t("dialog.settings.deleteConfirmDesc")}
+            </AlertDialogDescription>
+          </AlertDialogHeader>
+          <AlertDialogFooter>
+            <AlertDialogCancel disabled={isDeleting}>{t("dialog.knowledge.cancel")}</AlertDialogCancel>
+            <AlertDialogAction
+              onClick={(e) => {
+                e.preventDefault()
+                handleDelete()
+              }}
+              disabled={isDeleting}
+              className="bg-destructive text-destructive-foreground hover:bg-destructive/90"
+            >
+              {isDeleting ? t("dialog.settings.processing") : t("dialog.settings.delete")}
+            </AlertDialogAction>
+          </AlertDialogFooter>
+        </AlertDialogContent>
+      </AlertDialog>
    </Card>
  )
 }
--- a/src/modules/textbooks/components/textbook-form-dialog.tsx
+++ b/src/modules/textbooks/components/textbook-form-dialog.tsx
@@ -42,12 +42,17 @@ export function TextbookFormDialog() {
  const [open, setOpen] = useState(false)

  const handleSubmit = async (formData: FormData) => {
-    const result = await createTextbookAction(null, formData)
-    if (result.success) {
-      toast.success(result.message)
-      setOpen(false)
-    } else {
-      toast.error(result.message)
+    try {
+      const result = await createTextbookAction(null, formData)
+      if (result.success) {
+        toast.success(result.message)
+        setOpen(false)
+      } else {
+        toast.error(result.message)
+      }
+    } catch (e) {
+      console.error("Failed to create textbook", e)
+      toast.error(t("reader.createFailed"))
    }
  }

--- a/src/modules/textbooks/components/textbook-reader.tsx
+++ b/src/modules/textbooks/components/textbook-reader.tsx
@@ -193,7 +193,7 @@ export function TextbookReader({
      }
    } catch (e) {
      console.error("Failed to save chapter content", e)
-      toast.error("Failed to save content")
+      toast.error(t("reader.saveFailed"))
    } finally {
      setIsSaving(false)
    }
--- a/src/modules/textbooks/components/textbook-settings-dialog.tsx
+++ b/src/modules/textbooks/components/textbook-settings-dialog.tsx
@@ -52,13 +52,19 @@ export function TextbookSettingsDialog({ textbook, trigger }: TextbookSettingsDi

  const handleUpdate = async (formData: FormData) => {
    setLoading(true)
-    const result = await updateTextbookAction(textbook.id, null, formData)
-    setLoading(false)
-    if (result.success) {
-      toast.success(result.message)
-      setOpen(false)
-    } else {
-      toast.error(result.message)
+    try {
+      const result = await updateTextbookAction(textbook.id, null, formData)
+      if (result.success) {
+        toast.success(result.message)
+        setOpen(false)
+      } else {
+        toast.error(result.message)
+      }
+    } catch (e) {
+      console.error("Failed to update textbook", e)
+      toast.error(t("reader.updateFailed"))
+    } finally {
+      setLoading(false)
    }
  }

@@ -66,14 +72,20 @@ export function TextbookSettingsDialog({ textbook, trigger }: TextbookSettingsDi
  const handleDelete = async () => {
    setDeleteDialogOpen(false)
    setLoading(true)
-    const result = await deleteTextbookAction(textbook.id)
+    try {
+      const result = await deleteTextbookAction(textbook.id)

-    if (result.success) {
-      toast.success(result.message)
-      router.push("/teacher/textbooks")
-    } else {
+      if (result.success) {
+        toast.success(result.message)
+        router.push("/teacher/textbooks")
+      } else {
+        toast.error(result.message)
+      }
+    } catch (e) {
+      console.error("Failed to delete textbook", e)
+      toast.error(t("reader.deleteFailed"))
+    } finally {
      setLoading(false)
-      toast.error(result.message)
    }
  }

--- a/src/shared/i18n/messages/en/textbooks.json
+++ b/src/shared/i18n/messages/en/textbooks.json
@@ -48,6 +48,11 @@
    "cancel": "Cancel",
    "save": "Save",
    "saving": "Saving...",
+    "saveFailed": "Failed to save",
+    "createFailed": "Failed to create",
+    "updateFailed": "Failed to update",
+    "deleteFailed": "Failed to delete",
+    "questionCreatorDefaultContent": "Please explain the knowledge point: {name}",
    "addKnowledgePoint": "Add Knowledge Point",
    "clickToViewKp": "Click to view knowledge point details",
    "noChapters": "No chapters",
@@ -228,12 +233,20 @@
      "viewAllQuestions": "View all questions",
      "editPrerequisite": "Edit prerequisites",
      "addPrerequisite": "Add prerequisite",
+      "addPrerequisiteTitle": "Add Prerequisite Knowledge Point",
+      "addPrerequisiteDesc": "Select a knowledge point as the prerequisite of the current one.",
+      "selectPrerequisite": "Select a prerequisite knowledge point",
      "removePrerequisite": "Remove",
      "noPrerequisites": "No prerequisite knowledge points",
      "noSuccessors": "No successor knowledge points",
      "masteryNotAssessed": "Not assessed",
      "correctRate": "Correct rate",
-      "totalQuestions": "Total questions"
+      "totalQuestions": "Total questions",
+      "prerequisiteAdded": "Prerequisite added",
+      "prerequisiteRemoved": "Prerequisite removed",
+      "cancel": "Cancel",
+      "confirm": "Confirm",
+      "saving": "Saving..."
    },
    "toolbar": {
      "search": "Search knowledge points",
--- a/src/shared/i18n/messages/zh-CN/textbooks.json
+++ b/src/shared/i18n/messages/zh-CN/textbooks.json
@@ -48,6 +48,11 @@
    "cancel": "取消",
    "save": "保存",
    "saving": "保存中...",
+    "saveFailed": "保存失败",
+    "createFailed": "创建失败",
+    "updateFailed": "更新失败",
+    "deleteFailed": "删除失败",
+    "questionCreatorDefaultContent": "请讲解知识点：{name}",
    "addKnowledgePoint": "添加知识点",
    "clickToViewKp": "点击查看知识点详情",
    "noChapters": "暂无章节",
@@ -228,12 +233,20 @@
      "viewAllQuestions": "查看全部题目",
      "editPrerequisite": "编辑前置依赖",
      "addPrerequisite": "添加前置",
+      "addPrerequisiteTitle": "添加前置知识点",
+      "addPrerequisiteDesc": "选择一个知识点作为当前知识点的前置依赖。",
+      "selectPrerequisite": "请选择前置知识点",
      "removePrerequisite": "移除",
      "noPrerequisites": "暂无前置知识点",
      "noSuccessors": "暂无后置知识点",
      "masteryNotAssessed": "未测评",
      "correctRate": "正确率",
-      "totalQuestions": "总题数"
+      "totalQuestions": "总题数",
+      "prerequisiteAdded": "前置依赖已添加",
+      "prerequisiteRemoved": "前置依赖已移除",
+      "cancel": "取消",
+      "confirm": "确认",
+      "saving": "保存中..."
    },
    "toolbar": {
      "search": "搜索知识点",