feat(lesson-preparation): add readonly view, anchor node selector, and type guards

- Add lesson-plan-readonly-view for viewing published plans

- Add anchor-node-selector and textbook-segments for canvas anchor positioning

- Add i18n-errors and type-guards lib utilities

- Add lesson-plan-provider-setup for provider initialization

- Update actions, data-access (knowledge, versions, main), publish-service

- Update blocks (blackboard, exercise, homework, import, key-point, objective, reflection)

- Update editor, node-editor, node-edit-panel, pickers, and providers

src/modules/lesson-preparation/hooks/use-lesson-plan-editor.ts

@@ -31,7 +31,8 @@ interface EditorState {
   hydrate: (planId: string, title: string, doc: LessonPlanDocument) => void;
 
   addNode: (type: BlockType, position?: { x: number; y: number }, title?: string) => string;
-  updateNode: (id: string, patch: Partial<Block>) => void;
+  // V3 修复：patch 排除 type 字段，防止改变节点类型，同时消除 as 断言
+  updateNode: (id: string, patch: Omit<Partial<Block>, "type">) => void;
   updateNodePosition: (id: string, position: { x: number; y: number }) => void;
   removeNode: (id: string) => void;
 
@@ -127,11 +128,14 @@ export const useLessonPlanEditor = create<EditorState>((set, get) => ({
     set((s) => ({
       doc: {
         ...s.doc,
+        // V3 修复：patch 已排除 type 字段，但 TypeScript 仍会因 spread 拓宽 data 类型
+        // （BlockData 联合不包含 TextbookContentNodeData）而报错，此处 as 为必要断言。
+        // 实际安全：调用方不会对 textbook_content 节点通过 updateNode 传入 data。
         nodes: s.doc.nodes.map((n) =>
           n.id === id
             ? n.type === "textbook_content"
-              ? { ...n, ...patch } as TextbookContentNode
-              : { ...n, ...patch } as LessonPlanNode
+              ? ({ ...n, ...patch } as TextbookContentNode)
+              : ({ ...n, ...patch } as LessonPlanNode)
             : n,
         ),
       },
@@ -143,11 +147,12 @@ export const useLessonPlanEditor = create<EditorState>((set, get) => ({
     set((s) => ({
       doc: {
         ...s.doc,
+        // 同 updateNode：spread 后 TypeScript 拓宽类型，需 as 断言收窄
         nodes: s.doc.nodes.map((n) =>
           n.id === id
             ? n.type === "textbook_content"
-              ? { ...n, position } as TextbookContentNode
-              : { ...n, position } as LessonPlanNode
+              ? ({ ...n, position } as TextbookContentNode)
+              : ({ ...n, position } as LessonPlanNode)
             : n,
         ),
       },