fix: enforce render-safe detail copy without screen meta labels

app/api/canvas/detail-plan/route.ts

@@ -244,6 +244,19 @@ const TITLE_META_TERMS = [
   "证据背书",
 ];
 
+const RENDER_META_PATTERNS: RegExp[] = [
+  /第\s*\d+\s*屏/gi,
+  /\bscreen\s*\d+\b/gi,
+  /\bframe\s*\d+\b/gi,
+  /核心机制拆解/gi,
+  /机制拆解/gi,
+  /差异强化/gi,
+  /证据收口/gi,
+  /核心收益可证/gi,
+  /方案拆解/gi,
+  /信任收口/gi,
+];
+
 function hasPlanningTitleMeta(value: string): boolean {
   const text = String(value || "").trim();
   if (!text) return false;
@@ -259,6 +272,14 @@ function stripAgentPlanningPhrases(value: string): string {
   return result.replace(/\s+/g, " ").trim();
 }
 
+function stripRenderMetaTerms(value: string): string {
+  let result = String(value || "");
+  for (const pattern of RENDER_META_PATTERNS) {
+    result = result.replace(pattern, " ");
+  }
+  return result.replace(/\s+/g, " ").trim();
+}
+
 function desensitizeAudienceCopy(value: string, language: "zh" | "en"): string {
   let result = String(value || "");
   if (!result) return result;
@@ -1245,6 +1266,45 @@ function sanitizePlannedScreens(
   return fallbackScreens.map((fallback, index) => sanitizeScreen(raw[index], fallback, language));
 }
 
+function sanitizeScreensForRender(params: {
+  screens: DetailPlanScreen[];
+  coreFocus: DetailCoreFocusContext;
+  language: "zh" | "en";
+}): DetailPlanScreen[] {
+  const { screens, coreFocus, language } = params;
+  return screens.map((screen, index) => {
+    const cleanedTitle = stripRenderMetaTerms(screen.title);
+    const title =
+      cleanedTitle && !hasPlanningTitleMeta(cleanedTitle)
+        ? cleanedTitle
+        : index === 0
+          ? coreFocus.firstScreenTitle
+          : language === "zh"
+            ? "舒适升级"
+            : "Comfort Upgrade";
+    const subtitleRaw = stripRenderMetaTerms(screen.subtitle);
+    const subtitle =
+      subtitleRaw || (index === 0 ? coreFocus.firstScreenSubtitle : screen.subtitle);
+    return {
+      ...screen,
+      title,
+      subtitle,
+      objective: stripRenderMetaTerms(screen.objective),
+      copy: stripRenderMetaTerms(screen.copy),
+      layoutNote: stripRenderMetaTerms(screen.layoutNote),
+      modelReason: stripRenderMetaTerms(screen.modelReason),
+      bundleReason: stripRenderMetaTerms(screen.bundleReason),
+      visualPrompt: stripRenderMetaTerms(screen.visualPrompt),
+      fabe: {
+        b: stripRenderMetaTerms(screen.fabe.b),
+        f: stripRenderMetaTerms(screen.fabe.f),
+        a: stripRenderMetaTerms(screen.fabe.a),
+        e: stripRenderMetaTerms(screen.fabe.e),
+      },
+    };
+  });
+}
+
 function sanitizeGlobalStyle(
   raw: unknown,
   fallback: DetailPlanResponse["globalStyle"],
@@ -1875,7 +1935,12 @@ export async function POST(request: Request) {
 
     const shouldUsePreflightPlan = qualityChecksAfterPreflight.passed && preflightPassed;
     const shouldFallback = !shouldUsePreflightPlan;
-    const screens = shouldFallback ? fallback.screens : preflightScreens;
+    const screensRaw = shouldFallback ? fallback.screens : preflightScreens;
+    const screens = sanitizeScreensForRender({
+      screens: screensRaw,
+      coreFocus,
+      language,
+    });
     const globalStyle = shouldFallback ? fallback.globalStyle : preflight.candidateGlobalStyle;
     const qualityIssuesMerged = [
       ...new Set([