feat(lesson-preparation): major update with AI features, schedules, and new components

- Add actions-schedules.ts and data-access-schedules.ts for schedule management

- Add AI differentiation, AI feedback, consistency check dialogs

- Add attachment-picker, curriculum-heatmap, print-view, version-diff-view

- Add lesson-plan-mobile-view and schedule-dialog components

- Add lib: ai-differentiation, ai-feedback, auto-layout, consistency-check,

  curriculum-coverage, export, version-diff

- Add history-slice hook for version history

- Update existing components, hooks, providers, services, types

- Add teacher lesson-plans heatmap and library pages

src/modules/lesson-preparation/components/node-editor.tsx

@@ -14,8 +14,11 @@ import {
   type Connection,
   applyEdgeChanges,
   BackgroundVariant,
+  Panel,
 } from "@xyflow/react";
 import "@xyflow/react/dist/style.css";
+import { LayoutGrid } from "lucide-react";
+import { Button } from "@/shared/components/ui/button";
 import { useLessonPlanEditor } from "../hooks/use-lesson-plan-editor";
 import { LessonNode } from "./nodes/lesson-node";
 import { TextbookContentNode as TextbookContentNodeComponent } from "./nodes/textbook-content-node";
@@ -43,8 +46,14 @@ export function NodeEditor({}: Props) {
     setEdges,
     addAnchor,
     addNode,
+    autoLayout,
   } = useLessonPlanEditor();
 
+  // V5-8：自动布局按钮
+  const handleAutoLayout = useCallback(() => {
+    autoLayout("TB");
+  }, [autoLayout]);
+
   // P1-1：构建可锚定的教学节点列表（排除正文节点）
   const anchorableNodes = useMemo(
     () =>
@@ -233,6 +242,10 @@ export function NodeEditor({}: Props) {
         }}
         proOptions={{ hideAttribution: true }}
         className="bg-surface-container-low"
+        onlyRenderVisibleElements
+        minZoom={0.2}
+        maxZoom={2.5}
+        elevateNodesOnSelect={false}
       >
         <Background
           variant={BackgroundVariant.Dots}
@@ -241,6 +254,20 @@ export function NodeEditor({}: Props) {
           color="#ccc"
         />
         <Controls className="!bg-surface !border-outline-variant" />
+        {/* V5-8：自动布局按钮 */}
+        <Panel position="top-right" className="!m-2">
+          <Button
+            variant="outline"
+            size="sm"
+            onClick={handleAutoLayout}
+            disabled={doc.nodes.length === 0}
+            title={t("editor.autoLayoutHint")}
+            aria-label={t("editor.autoLayout")}
+          >
+            <LayoutGrid className="w-4 h-4 mr-1" />
+            {t("editor.autoLayout")}
+          </Button>
+        </Panel>
         <MiniMap
           className="!bg-surface !border-outline-variant"
           nodeColor={(n) => {