fix: 修复md文件中图片不显示的问题

frontend/src/app/workspace/chats/[thread_id]/page.tsx

@@ -333,8 +333,7 @@ export default function ChatPage() {
                 )}
               >
                 <div className="flex size-full justify-center">
-                    {!showWelcomeStyle &&
-                      <MessageList
+                    <MessageList
                       className={cn(
                         "size-full",
                         (!showWelcomeStyle || hasSubmitted) && "pt-[58px]",
@@ -347,8 +346,10 @@ export default function ChatPage() {
                           : thread.messages.slice(historyCutoff)
                       }
                       paddingBottom={todoListCollapsed ? 160 : 280}
+                      // !showWelcomeStyle || hasSubmitted
+                      showScrollToBottomButton={!showWelcomeStyle}
+                      scrollButtonClassName="bottom-[112px]"
                     />
-                    }
                 </div>
               </main>
             </div>

frontend/src/components/ai-elements/conversation.tsx

@@ -84,7 +84,7 @@ export const ConversationScrollButton = ({
     !isAtBottom && (
       <Button
         className={cn(
-          "absolute bottom-4 left-[50%] translate-x-[-50%] rounded-full",
+          "absolute bottom-3 left-1/2 -translate-x-1/2 rounded-full",
           className,
         )}
         onClick={handleScrollToBottom}

frontend/src/components/workspace/artifacts/artifact-file-detail.tsx

@@ -9,6 +9,7 @@ import {
   useEffect,
   useMemo,
   useState,
+  type ComponentProps,
   type HTMLAttributes,
 } from "react";
 import { toast } from "sonner";
@@ -32,7 +33,7 @@ import { DropdownSelector } from "@/components/ui/dropdown-selector";
 import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group";
 import { CodeEditor } from "@/components/workspace/code-editor";
 import { useArtifactContent } from "@/core/artifacts/hooks";
-import { urlOfArtifact } from "@/core/artifacts/utils";
+import { resolveArtifactURL, urlOfArtifact } from "@/core/artifacts/utils";
 import { useI18n } from "@/core/i18n/hooks";
 import { streamdownPlugins } from "@/core/streamdown";
 import { checkCodeFile, getFileName } from "@/core/utils/files";
@@ -473,11 +474,12 @@ export function ArtifactFileDetail({
               content={displayContent}
               language={language ?? "text"}
               zoom={zoom}
+              threadId={threadId}
             />
 
           )}
         {isCodeFile && viewMode === "code" && (
-          <div className="min-h-full mb-[180px]  rounded-b-[10px] bg-white p-0 mb-0">
+          <div className="min-h-full mb-[207px]  rounded-b-[10px] bg-white p-0 mb-0">
             <CodeEditor
               className="size-full resize-none rounded-none border-none py-[20px]"
               value={displayContent ?? ""}
@@ -487,14 +489,13 @@ export function ArtifactFileDetail({
           </div>
         )}
         {!isCodeFile && (
-          <div className="h-full mb-[180px]">
-            <iframe
-              className="size-full border-0"
-              srcDoc={artifactViewerSrcDoc}
-              sandbox="allow-same-origin allow-scripts allow-downloads"
-              title={`Artifact preview: ${fileName}`}
-            />
-          </div>
+          <PreviewIframe
+            className="size-full border-0"
+            containerClassName="h-full mb-[207px]"
+            srcDoc={artifactViewerSrcDoc}
+            sandbox="allow-same-origin allow-scripts allow-downloads"
+            title={`Artifact preview: ${fileName}`}
+          />
         )}
       </ArtifactContent>
     </Artifact>
@@ -505,17 +506,22 @@ export function ArtifactFilePreview({
   content,
   language,
   zoom = 100,
+  threadId,
 }: {
   content: string;
   language: string;
   zoom?: number;
+  threadId?: string;
 }) {
   const zoomScale = zoom / 100;
+  const normalizedContent = useMemo(() => {
+    return rewriteArtifactImagePaths(content ?? "", threadId);
+  }, [content, threadId]);
 
   if (language === "markdown") {
     return (
       <div
-        className={cn("w-full bg-white mb-[207px] p-[20px]")}
+        className={cn("w-full bg-white  mb-[207px] p-[20px]")}
         style={{ "--zoom-scale": zoomScale } as React.CSSProperties}
       >
         <Streamdown
@@ -523,7 +529,7 @@ export function ArtifactFilePreview({
           {...streamdownPlugins}
           components={{ a: CitationLink }}
         >
-          {content ?? ""}
+          {normalizedContent}
         </Streamdown>
       </div>
 
@@ -531,21 +537,81 @@ export function ArtifactFilePreview({
   }
   if (language === "html") {
     return (
-      <div className="h-full mb-[180px]">
-        <iframe
-          className="size-full"
-          title="Artifact preview"
-          srcDoc={content}
-          sandbox="allow-scripts allow-forms"
-          style={{ zoom: zoomScale }}
-        />
-      </div>
+      <PreviewIframe
+        className="size-full"
+        containerClassName="h-full mb-[207px]"
+        title="Artifact preview"
+        srcDoc={normalizedContent}
+        sandbox="allow-scripts allow-forms"
+        style={{ zoom: zoomScale }}
+      />
 
     );
   }
   return null;
 }
 
+function PreviewIframe({
+  className,
+  containerClassName,
+  onLoad,
+  src,
+  srcDoc,
+  ...props
+}: ComponentProps<"iframe"> & {
+  containerClassName?: string;
+}) {
+  const [isLoading, setIsLoading] = useState(true);
+
+  useEffect(() => {
+    setIsLoading(true);
+  }, [src, srcDoc]);
+
+  return (
+    <div className={cn("relative", containerClassName)}>
+      <iframe
+        className={className}
+        src={src}
+        srcDoc={srcDoc}
+        onLoad={(event) => {
+          setIsLoading(false);
+          onLoad?.(event);
+        }}
+        {...props}
+      />
+      {isLoading && (
+        <div className="absolute inset-0 z-10 flex items-center justify-center bg-white/85">
+          <LoaderIcon className="text-muted-foreground size-5 animate-spin" />
+        </div>
+      )}
+    </div>
+  );
+}
+
+function rewriteArtifactImagePaths(content: string, threadId?: string) {
+  if (!threadId || !/\/?mnt\/user-data\//.test(content)) {
+    return content;
+  }
+
+  const markdownRewritten = content.replace(
+    /!\[([^\]]*)\]\(\s*(\/?mnt\/user-data\/outputs\/[^)\s]+)\s*\)/g,
+    (_full, alt, rawPath) => {
+      const normalizedPath = rawPath.startsWith("/") ? rawPath : `/${rawPath}`;
+      const artifactUrl = resolveArtifactURL(normalizedPath, threadId);
+      return `![${alt}](${artifactUrl})`;
+    },
+  );
+
+  return markdownRewritten.replace(
+    /(<img\b[^>]*\bsrc\s*=\s*)(["'])(\/?mnt\/user-data\/outputs\/[^"']+)\2/gi,
+    (_full, prefix, quote, rawPath) => {
+      const normalizedPath = rawPath.startsWith("/") ? rawPath : `/${rawPath}`;
+      const artifactUrl = resolveArtifactURL(normalizedPath, threadId);
+      return `${prefix}${quote}${artifactUrl}${quote}`;
+    },
+  );
+}
+
 type ArtifactPreviewKind =
   | "html"
   | "image"

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

@@ -4,6 +4,7 @@ import type { UseStream } from "@langchain/langgraph-sdk/react";
 import {
   Conversation,
   ConversationContent,
+  ConversationScrollButton,
 } from "@/components/ai-elements/conversation";
 import { useI18n } from "@/core/i18n/hooks";
 import {
@@ -37,6 +38,8 @@ export function MessageList({
   messagesOverride,
   suppressThreadLoading = false,
   paddingBottom = 160,
+  showScrollToBottomButton = false,
+  scrollButtonClassName,
 }: {
   className?: string;
   threadId?: string;
@@ -45,6 +48,8 @@ export function MessageList({
   messagesOverride?: Message[];
   suppressThreadLoading?: boolean;
   paddingBottom?: number;
+  showScrollToBottomButton?: boolean;
+  scrollButtonClassName?: string;
 }) {
   const { t } = useI18n();
   const rehypePlugins = useRehypeSplitWordsIntoSpans(thread.isLoading);
@@ -205,9 +210,19 @@ export function MessageList({
             />
           );
         })}
-        {thread.isLoading && <StreamingIndicator className="my-4" />}
+        {thread.isLoading && messages.length > 0 && <StreamingIndicator className="my-4" />}
         <div style={{ height: `${paddingBottom}px` }} />
       </ConversationContent>
+      {/* showScrollToBottomButton */}
+      { showScrollToBottomButton && (
+        <ConversationScrollButton
+          className={cn(
+            "z-20 rounded-full border bg-white/90 shadow-sm backdrop-blur-sm",
+            scrollButtonClassName,
+          )}
+          title="滚动到底部"
+        />
+      )}
     </Conversation>
   );
 }

skills/public/frontend-design/SKILL.md

@@ -12,6 +12,16 @@ The user provides frontend requirements: a component, page, application, or inte
 
 **MANDATORY**: The entry HTML file MUST be named `index.html`. This is a strict requirement for all generated frontend projects to ensure compatibility with standard web hosting and deployment workflows.
 
+### CDN Requirement (China-Friendly)
+
+When generating plain HTML projects that reference third-party JS/CSS from CDN, prefer China-friendly CDN links by default:
+
+1. `https://cdn.bootcdn.net` (preferred)
+2. `https://cdn.staticfile.net` (fallback)
+3. `https://registry.npmmirror.com` (for npm package file URLs when needed)
+
+Avoid `unpkg.com` and `cdnjs.cloudflare.com` as primary CDN links in generated HTML.
+
 ## Design Thinking
 
 Before coding, understand the context and commit to a BOLD aesthetic direction: