fix(markdown): keep CJK punctuation out of bare-URL autolinks

marked's GFM url tokenizer swallows any non-space text after a bare URL,
including fullwidth punctuation and Chinese annotations written directly
after it ("https://x.com/docs（说明）了解更多"). Switch the autolink
tokenizer to marked-linkify-it, which treats Unicode punctuation as a URL
boundary, so fullwidth parens and CJK punctuation are trimmed naturally.

packages/ui/src/components/chat/markdown/markdownCore.test.ts

@@ -187,3 +187,30 @@ describe('Markdown images', () => {
     expect(html).not.toContain('data-openchamber-markdown-image');
   });
 });
+
+describe('CJK-aware link parsing', () => {
+  const hrefOf = (html: string): string | null => /<a\b[^>]*href="([^"]*)"/.exec(html)?.[1] ?? null;
+
+  test('bare URL followed by a CJK annotation trims the annotation from the href', () => {
+    const html = renderMarkdownSync('访问 https://example.com/docs（中文说明）了解更多');
+    expect(hrefOf(html)).toBe('https://example.com/docs');
+  });
+
+  test('bare URL followed by CJK punctuation trims the punctuation', () => {
+    expect(hrefOf(renderMarkdownSync('地址 https://example.com/guide，详见'))).toBe(
+      'https://example.com/guide',
+    );
+    expect(hrefOf(renderMarkdownSync('官网 https://example.com。'))).toBe('https://example.com');
+  });
+
+  test('correct links are unaffected', () => {
+    expect(hrefOf(renderMarkdownSync('官方文档见 [这里](https://docs.example.com)（中文说明）'))).toBe(
+      'https://docs.example.com',
+    );
+    expect(hrefOf(renderMarkdownSync('[下载](https://dl.example.com/安装包（正式版）)'))).toBe(
+      'https://dl.example.com/安装包（正式版）',
+    );
+    expect(hrefOf(renderMarkdownSync('[a](url(1))'))).toBe('url(1)');
+    expect(hrefOf(renderMarkdownSync('[a](url "title")'))).toBe('url');
+  });
+});

packages/ui/src/components/chat/markdown/markdownCore.ts

@@ -1,4 +1,5 @@
 import { Marked, marked, type Tokens } from 'marked';
+import markedLinkifyIt from 'marked-linkify-it';
 import remend from 'remend';
 import katex from 'katex';
 import DOMPurify from 'dompurify';
@@ -321,10 +322,15 @@ const blockMathExtension = {
   },
 };
 
-const createParser = (imageMode: MarkdownImageMode) => new Marked().use({
-  gfm: true,
-  breaks: false,
-  extensions: [inlineMathExtension, blockMathExtension],
+// marked's GFM autolink swallows CJK punctuation after a bare URL, so switch
+// to marked-linkify-it, which treats Unicode punctuation as a URL boundary.
+// Plain CJK characters right after a URL are still consumed, matching GitHub.
+const createParser = (imageMode: MarkdownImageMode) => new Marked().use(
+  markedLinkifyIt({ fuzzyLink: false }),
+  {
+    gfm: true,
+    breaks: false,
+    extensions: [inlineMathExtension, blockMathExtension],
   renderer: {
     // Assistant output is untrusted. Markdown constructs still render as HTML,
     // but raw HTML must remain visible text so it cannot introduce active DOM