fix(citations): use markdown link text as fallback for display

When citation data is not available, use the markdown link text
(children) as display text instead of just the domain. This ensures
that links like [OpenJudge](github.com/...) show 'OpenJudge' instead
of just 'github.com'.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/components/ai-elements/inline-citation.tsx

@@ -310,10 +310,14 @@ export const CitationLink = ({
 }: CitationLinkProps) => {
   const domain = extractDomainFromUrl(href);
   
-  // Priority: citation.title > domain
-  // When citation has title, use it for consistent display
-  // This ensures correct title shows even during streaming when children might be generic
-  const displayText = citation?.title || domain;
+  // Priority: citation.title > children (if meaningful) > domain
+  // - citation.title: from parsed <citations> block, most accurate
+  // - children: from markdown link text [Text](url), used when no citation data
+  // - domain: fallback when both above are unavailable
+  // Skip children if it's a generic placeholder like "Source"
+  const childrenText = typeof children === "string" ? children : null;
+  const isGenericText = childrenText === "Source" || childrenText === "来源";
+  const displayText = citation?.title || (!isGenericText && childrenText) || domain;
 
   return (
     <InlineCitationCard>