fix: isolate canvas CJK strings and guard build encoding

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

apps/web/scripts/check-canvas-cjk.mjs

@@ -0,0 +1,84 @@
+#!/usr/bin/env node
+/**
+ * Fail the build if canvas UI CJK is corrupted or missing.
+ * Root cause we guard against: Windows tools rewriting TopologyCanvas.tsx
+ * with "?" for multibyte UTF-8, and Latin-1 middot 0xb7 breaking UTF-8.
+ */
+import { readFileSync, existsSync } from "node:fs";
+import { dirname, join } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const root = join(dirname(fileURLToPath(import.meta.url)), "..");
+const errors = [];
+
+function mustUtf8(rel) {
+  const path = join(root, rel);
+  if (!existsSync(path)) {
+    errors.push(`missing: ${rel}`);
+    return null;
+  }
+  const buf = readFileSync(path);
+  try {
+    return new TextDecoder("utf-8", { fatal: true }).decode(buf);
+  } catch (e) {
+    errors.push(`${rel}: invalid UTF-8 (${e.message})`);
+    return null;
+  }
+}
+
+const labels = mustUtf8("src/canvas-ui-text.ts");
+if (labels) {
+  const required = [
+    "选择",
+    "平移",
+    "连线",
+    "单点",
+    "整枝",
+    "气泡",
+    "卡片",
+    "撤销",
+    "未命名",
+  ];
+  for (const s of required) {
+    if (!labels.includes(s)) errors.push(`canvas-ui-text.ts missing: ${s}`);
+  }
+  if (/^\s*\w+:\s*["']\?{2,}["']/m.test(labels)) {
+    errors.push("canvas-ui-text.ts contains corrupted ?? string literals");
+  }
+}
+
+const canvas = mustUtf8("src/TopologyCanvas.tsx");
+if (canvas) {
+  // Toolbar / controls must use canvasUi — no inline ?? placeholders.
+  const badUi = [
+    ...canvas.matchAll(/\["select",\s*"(\?+)"/g),
+    ...canvas.matchAll(/\["pan",\s*"(\?+)"/g),
+    ...canvas.matchAll(/\["link",\s*"(\?+)"/g),
+  ];
+  if (badUi.length) {
+    errors.push(
+      "TopologyCanvas.tsx has corrupted tool labels (??). Use canvasUi from canvas-ui-text.ts",
+    );
+  }
+  if (!canvas.includes("canvas-ui-text") && !canvas.includes("canvasUi")) {
+    errors.push("TopologyCanvas.tsx must import canvasUi from canvas-ui-text.ts");
+  }
+  // Detect classic corruption: many consecutive ? inside quotes in JSX title/aria
+  const titleQ = [...canvas.matchAll(/title=\{?["'](\?{2,})["']\}?/g)];
+  if (titleQ.length >= 3) {
+    errors.push(
+      `TopologyCanvas.tsx looks CJK-corrupted (${titleQ.length} title="??" hits). Restore via canvasUi.`,
+    );
+  }
+}
+
+if (errors.length) {
+  console.error("[check-canvas-cjk] FAILED:");
+  for (const e of errors) console.error(" -", e);
+  console.error(
+    "Fix: edit src/canvas-ui-text.ts (UTF-8 only). Never pipe CJK through PowerShell Set-Content.",
+  );
+  process.exit(1);
+}
+
+console.log("[check-canvas-cjk] OK");