fix: isolate canvas CJK strings and guard build encoding

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/web/src/canvas-ui-text.ts

@@ -0,0 +1,58 @@
+/**
+ * Canvas UI copy (zh). Keep ALL user-facing CJK here.
+ * TopologyCanvas.tsx must not embed Chinese literals — they get corrupted
+ * by Windows/PowerShell default encodings (question-mark placeholders / invalid 0xb7 bytes).
+ */
+export const canvasUi = {
+  unnamed: "未命名",
+  newNode: "新节点",
+  leftChild: "左侧子主题",
+  rightChild: "右侧子主题",
+  sibling: "兄弟节点",
+  relationLabel: "关联",
+
+  toolbarAria: "画布工具",
+  controlsAria: "视图控制",
+
+  backRosterTitle: "返回画布列表",
+  backRoster: "返回",
+
+  toolSelect: "选择",
+  toolPan: "平移",
+  toolLink: "连线",
+
+  dragNode: "单点",
+  dragBranch: "整枝",
+  dragNodeTitle: "单点拖拽：只移动当前节点 (N)；按住 Shift 也可临时单点",
+  dragBranchTitle: "整枝拖拽：节点与子孙一起移动 (B)",
+
+  bubble: "气泡",
+  card: "卡片",
+  bubbleTitle: "气泡视图：精简标题",
+  cardTitle: "卡片视图：展开属性面板",
+  unpin: "解钉",
+  unpinTitle: "取消钉住：让选中节点重新参与自动布局",
+  undo: "撤销",
+
+  fullscreen: "全屏",
+  exitFullscreen: "退出全屏",
+  zoomIn: "放大",
+  zoomInTitle: "放大 (+)",
+  zoomOut: "缩小",
+  zoomOutTitle: "缩小 (-)",
+  fit: "适应画布",
+  fitTitle: "适应画布 (F)",
+  lock: "锁定",
+  unlock: "解锁",
+  lockTitle: "锁定画布 (L)",
+  unlockTitle: "解锁画布 (L)",
+
+  addLeftChildTitle: "添加左侧子主题",
+  addRightChildTitle: "添加右侧子主题",
+
+  hintLocked: "已锁定 · 仅浏览/缩放/平移",
+  hintNodeDrag: "单点拖 · 只移动当前节点 · Shift 临时单点 · Esc 取消",
+  hintBranchDrag: "整枝拖 · 空白钉住 · 落到节点换父 · N 单点 · Esc 取消",
+} as const;
+
+export type CanvasUiKey = keyof typeof canvasUi;