feat(artifact): artifact markdown 表格复用 CopyButton

- ArtifactFilePreview 中 Streamdown 的 table 组件覆盖为 MarkdownTable
- artifact 区表格复制/下载行为与聊天区一致

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

@@ -14,6 +14,7 @@ import {
   useState,
   type CSSProperties,
   type ComponentProps,
+  type ComponentPropsWithoutRef,
   type HTMLAttributes,
 } from "react";
 import { toast } from "sonner";
@@ -40,6 +41,7 @@ import { CodeEditor } from "@/components/workspace/code-editor";
 import { useArtifactContent } from "@/core/artifacts/hooks";
 import { resolveArtifactURL, urlOfArtifact } from "@/core/artifacts/utils";
 import { useI18n } from "@/core/i18n/hooks";
+import { MarkdownTable } from "@/components/workspace/messages/markdown-content";
 import { streamdownPlugins } from "@/core/streamdown";
 import { checkCodeFile, getFileName } from "@/core/utils/files";
 import { useMarkdownDownload } from "@/core/utils/markdown-download";
@@ -909,11 +911,26 @@ export function ArtifactFilePreview({
   threadId: string;
   filepath?: string;
 }) {
+  const { t } = useI18n();
   const zoomScale = zoom / 100;
   const normalizedContent = useMemo(() => {
     return rewriteArtifactImagePaths(content ?? "", threadId, filepath);
   }, [content, threadId, filepath]);
 
+  const streamdownComponents = useMemo(
+    () => ({
+      a: CitationLink,
+      table: (props: ComponentPropsWithoutRef<"table">) => (
+        <MarkdownTable
+          copyLabel={t.clipboard.copyToClipboard}
+          downloadLabel={t.common.download}
+          {...props}
+        />
+      ),
+    }),
+    [t.clipboard.copyToClipboard, t.common.download],
+  );
+
   if (language === "markdown") {
     return (
       <div
@@ -923,7 +940,7 @@ export function ArtifactFilePreview({
         <Streamdown
           className="w-full"
           {...streamdownPlugins}
-          components={{ a: CitationLink }}
+          components={streamdownComponents}
         >
           {normalizedContent}
         </Streamdown>