fix(editor): post-process mention shortcodes to markdown link format

The Tiptap Mention extension's createInlineMarkdownSpec serializes
mentions as shortcodes [@ id="..." label="..."] — the .extend()
renderMarkdown override may not reliably take effect.

Added a robust fallback: post-process the editor's markdown output
by replacing shortcodes with [@Label](mention://type/id) using the
Tiptap JSON document for type info. Also preprocess stored shortcodes
in the Markdown renderer for backward compatibility.

apps/web/components/common/rich-text-editor.tsx

@@ -162,10 +162,44 @@ const RichTextEditor = forwardRef<RichTextEditorRef, RichTextEditorProps>(
     const onUpdateRef = useRef(onUpdate);
     const onSubmitRef = useRef(onSubmit);
 
-    // Helper to get markdown from @tiptap/markdown extension
+    // Helper to get markdown from @tiptap/markdown extension.
+    // Post-processes mention shortcodes [@ id="..." label="..."] → markdown
+    // links, using the Tiptap JSON doc for type info, in case the
+    // renderMarkdown override doesn't take effect.
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    const getEditorMarkdown = (ed: any): string =>
-      ed?.getMarkdown?.() ?? "";
+    const getEditorMarkdown = (ed: any): string => {
+      const md: string = ed?.getMarkdown?.() ?? "";
+      if (!md || !md.includes("[@ ")) return md;
+
+      // Build type map from editor JSON (which always has the type attr)
+      const json = ed?.getJSON?.();
+      const typeMap = new Map<string, string>();
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      function walk(node: any) {
+        if (node?.type === "mention" && node.attrs?.id) {
+          typeMap.set(node.attrs.id, node.attrs.type || "member");
+        }
+        if (node?.content) node.content.forEach(walk);
+      }
+      if (json) walk(json);
+
+      return md.replace(
+        /\[@\s+([^\]]*)\]/g,
+        (match: string, attrString: string) => {
+          const attrs: Record<string, string> = {};
+          const re = /(\w+)="([^"]*)"/g;
+          let m;
+          while ((m = re.exec(attrString)) !== null) {
+            if (m[1] && m[2] !== undefined) attrs[m[1]] = m[2];
+          }
+          const { id, label } = attrs;
+          if (!id || !label) return match;
+          const type = typeMap.get(id) || "member";
+          const display = type === "issue" ? label : `@${label}`;
+          return `[${display}](mention://${type}/${id})`;
+        },
+      );
+    };
 
     // Keep refs in sync without recreating editor
     onUpdateRef.current = onUpdate;

apps/web/components/markdown/Markdown.tsx

@@ -53,6 +53,28 @@ function urlTransform(url: string): string {
   return defaultUrlTransform(url)
 }
 
+/**
+ * Convert legacy mention shortcodes [@ id="UUID" label="LABEL"] to markdown
+ * link format [@LABEL](mention://member/UUID) so they render as styled mentions.
+ */
+function preprocessMentionShortcodes(text: string): string {
+  if (!text.includes('[@ ')) return text
+  return text.replace(
+    /\[@\s+([^\]]*)\]/g,
+    (match, attrString: string) => {
+      const attrs: Record<string, string> = {}
+      const re = /(\w+)="([^"]*)"/g
+      let m
+      while ((m = re.exec(attrString)) !== null) {
+        if (m[1] && m[2] !== undefined) attrs[m[1]] = m[2]
+      }
+      const { id, label } = attrs
+      if (!id || !label) return match
+      return `[@${label}](mention://member/${id})`
+    }
+  )
+}
+
 // File path detection regex - matches paths starting with /, ~/, or ./
 const FILE_PATH_REGEX =
   /^(?:\/|~\/|\.\/)[\w\-./@]+\.(?:ts|tsx|js|jsx|mjs|cjs|md|json|yaml|yml|py|go|rs|css|scss|less|html|htm|txt|log|sh|bash|zsh|swift|kt|java|c|cpp|h|hpp|rb|php|xml|toml|ini|cfg|conf|env|sql|graphql|vue|svelte|astro|prisma)$/i
@@ -291,8 +313,11 @@ export function Markdown({
     [mode, onUrlClick, onFileClick]
   )
 
-  // Preprocess to convert raw URLs and file paths to markdown links
-  const processedContent = React.useMemo(() => preprocessLinks(children), [children])
+  // Preprocess: convert mention shortcodes and raw URLs/file paths to markdown links
+  const processedContent = React.useMemo(
+    () => preprocessLinks(preprocessMentionShortcodes(children)),
+    [children]
+  )
 
   return (
     <div className={cn('markdown-content break-words', className)}>