fix: 修复单个\n输入，渲染时不会换行的问题

frontend/src/components/workspace/messages/message-list-item.tsx

@@ -28,6 +28,7 @@ import { resolveArtifactURL } from "@/core/artifacts/utils";
 import { useI18n } from "@/core/i18n/hooks";
 import {
   extractContentFromMessage,
+  normalizeHumanMessageDisplayText,
   extractReasoningContentFromMessage,
   parseUploadedFiles,
   stripPriorityHintSuffix,
@@ -167,9 +168,11 @@ function MessageContent_({
 
   const contentToDisplay = useMemo(() => {
     if (isHuman) {
-      return rawContent
-        ? stripPriorityHintSuffix(stripUploadedFilesTag(rawContent))
-        : "";
+      if (!rawContent) {
+        return "";
+      }
+      const cleaned = stripPriorityHintSuffix(stripUploadedFilesTag(rawContent));
+      return normalizeHumanMessageDisplayText(cleaned);
     }
     return rawContent ?? "";
   }, [rawContent, isHuman]);

frontend/src/core/messages/utils.ts

@@ -364,6 +364,20 @@ export function stripPriorityHintSuffix(content: string): string {
     .trim();
 }
 
+/**
+ * Normalize human-authored message text for markdown rendering.
+ * - Decode literal "\n" into real line breaks.
+ * - Split Chinese-numbered items (e.g. "1）...") into separate paragraphs.
+ */
+export function normalizeHumanMessageDisplayText(content: string): string {
+  return content
+    .replace(/\\n/g, "\n")
+    .replace(/\r\n?/g, "\n")
+    .replace(/\n(?=\d+[）)]\s*)/g, "\n\n")
+    .replace(/\n{3,}/g, "\n\n")
+    .trim();
+}
+
 export function parseUploadedFiles(content: string): FileInMessage[] {
   // Match <uploaded_files>...</uploaded_files> tag
   const uploadedFilesRegex = /<uploaded_files>([\s\S]*?)<\/uploaded_files>/;