diff --git a/src/shared/i18n/messages/en/lesson-preparation.json b/src/shared/i18n/messages/en/lesson-preparation.json
index 04bb164..1c3d020 100644
--- a/src/shared/i18n/messages/en/lesson-preparation.json
+++ b/src/shared/i18n/messages/en/lesson-preparation.json
@@ -807,5 +807,61 @@
     "linkFailed": "Failed to link standard",
     "unlinkSuccess": "Standard unlinked from lesson plan",
     "unlinkFailed": "Failed to unlink standard"
+  },
+  "v4": {
+    "tree": {
+      "title": "Structure",
+      "addNode": "Add node",
+      "onPaper": "on paper",
+      "countSuffix": "nodes"
+    },
+    "paper": {
+      "textbookHeader": "Textbook content · editable copy",
+      "expandedCount": "{count} nodes expanded",
+      "anchorHere": "Anchor to node"
+    },
+    "detail": {
+      "designIntent": "Design intent",
+      "qaDialog": "Dialog design",
+      "addTurn": "Add a turn",
+      "turnTeacher": "Teacher · Ask",
+      "turnStudent": "Student · Answer",
+      "turnFollowup": "Teacher · Follow-up",
+      "expectedAnswer": "Expected answer",
+      "aiAssist": "AI assist",
+      "aiGenerateLayered": "Generate layered questions",
+      "aiFillExpected": "Fill expected answers",
+      "aiOptimizeFollowup": "Optimize follow-up",
+      "aiDifferentiation": "Differentiation suggestions",
+      "updated": "Updated {time}"
+    },
+    "contextMenu": {
+      "nodeOps": "Node operations",
+      "expandToPaper": "Expand to paper",
+      "collapseFromPaper": "Collapse from paper",
+      "moveUp": "Move up",
+      "moveDown": "Move down",
+      "aiAssist": "AI assist",
+      "aiGenerate": "Generate content",
+      "aiOptimize": "Optimize expression",
+      "aiDifferentiation": "Differentiation suggestions",
+      "aiLayeredQuestions": "Generate layered questions",
+      "copyNode": "Copy node",
+      "deleteNode": "Delete node",
+      "anchorToNode": "Anchor to node",
+      "insertPointAnchor": "Insert point anchor"
+    },
+    "interaction": {
+      "label": "Interaction",
+      "defaultTitle": "Interaction",
+      "round": "Round {n}",
+      "roleTeacher": "T",
+      "roleStudent": "S"
+    },
+    "migration": {
+      "legacyAnchorTitle": "Anchor format upgrade",
+      "legacyAnchorBody": "This plan uses a legacy anchor format. Some anchors are invalid. Please re-anchor.",
+      "legacyAnchorDismiss": "Got it"
+    }
   }
 }
diff --git a/src/shared/i18n/messages/zh-CN/lesson-preparation.json b/src/shared/i18n/messages/zh-CN/lesson-preparation.json
index 1254919..cc5108f 100644
--- a/src/shared/i18n/messages/zh-CN/lesson-preparation.json
+++ b/src/shared/i18n/messages/zh-CN/lesson-preparation.json
@@ -802,5 +802,61 @@
     },
     "linkSuccess": "已关联课标",
     "unlinkSuccess": "已取消关联"
+  },
+  "v4": {
+    "tree": {
+      "title": "结构",
+      "addNode": "添加节点",
+      "onPaper": "纸上",
+      "countSuffix": "节点"
+    },
+    "paper": {
+      "textbookHeader": "教材正文 · 可编辑副本",
+      "expandedCount": "{count} 节点已展开",
+      "anchorHere": "锚定到节点"
+    },
+    "detail": {
+      "designIntent": "设计意图",
+      "qaDialog": "对话设计",
+      "addTurn": "添加一轮对话",
+      "turnTeacher": "师 · 提问",
+      "turnStudent": "生 · 回答",
+      "turnFollowup": "师 · 追问",
+      "expectedAnswer": "预期回答",
+      "aiAssist": "AI 协助",
+      "aiGenerateLayered": "生成分层提问",
+      "aiFillExpected": "补充预期回答",
+      "aiOptimizeFollowup": "优化追问",
+      "aiDifferentiation": "差异化建议",
+      "updated": "更新于 {time}"
+    },
+    "contextMenu": {
+      "nodeOps": "节点操作",
+      "expandToPaper": "展开到正文",
+      "collapseFromPaper": "从正文收起",
+      "moveUp": "上移",
+      "moveDown": "下移",
+      "aiAssist": "AI 协助",
+      "aiGenerate": "生成本节点内容",
+      "aiOptimize": "优化表达",
+      "aiDifferentiation": "差异化建议",
+      "aiLayeredQuestions": "生成分层提问",
+      "copyNode": "复制节点",
+      "deleteNode": "删除节点",
+      "anchorToNode": "锚定到节点",
+      "insertPointAnchor": "插入点锚点"
+    },
+    "interaction": {
+      "label": "师生互动",
+      "defaultTitle": "师生互动",
+      "round": "第 {n} 轮",
+      "roleTeacher": "师",
+      "roleStudent": "生"
+    },
+    "migration": {
+      "legacyAnchorTitle": "锚点格式升级提示",
+      "legacyAnchorBody": "此课案使用旧版锚点格式，部分锚点已失效，请重新锚定。",
+      "legacyAnchorDismiss": "知道了"
+    }
   }
 }