fix(room): resolve mention IDs to display names when rendering messages

- Pass members/repos/aiConfigs lists to MessageContentWithMentions
- Add resolveName() that looks up ID → display name per mention type
- RoomMessageBubble now resolves user/repository/AI mention UIDs to real names

src/components/room/MessageMentions.tsx

@@ -1,4 +1,6 @@
-import { memo, useMemo } from 'react';
+import type { ProjectRepositoryItem, RoomMemberResponse } from '@/client';
+import type { RoomAiConfig } from '@/components/room/MentionPopover';
+import { memo, useCallback, useMemo } from 'react';
 import { cn } from '@/lib/utils';
 import { parse, type Node, type MentionMentionType } from '@/lib/mention-ast';
 
@@ -100,6 +102,12 @@ function extractFirstMentionName(text: string, type: MentionType): string | null
 
 interface MessageContentWithMentionsProps {
   content: string;
+  /** Members list for resolving user mention IDs to display names */
+  members?: RoomMemberResponse[];
+  /** Repository list for resolving repository mention IDs to display names */
+  repos?: ProjectRepositoryItem[];
+  /** AI configs for resolving AI mention IDs to display names */
+  aiConfigs?: RoomAiConfig[];
 }
 
 const mentionStyles: Record<string, string> = {
@@ -109,14 +117,19 @@ const mentionStyles: Record<string, string> = {
   notify: 'inline-flex items-center rounded bg-yellow-100/80 px-1.5 py-0.5 text-yellow-700 dark:bg-yellow-900/40 dark:text-yellow-300 font-medium cursor-pointer hover:bg-yellow-200 dark:hover:bg-yellow-900/60 transition-colors text-sm leading-5',
 };
 
-function renderNode(node: Node, index: number): React.ReactNode {
+function renderNode(
+  node: Node,
+  index: number,
+  resolveName: (type: string, id: string, label: string) => string,
+): React.ReactNode {
   if (node.type === 'text') {
     return <span key={index}>{node.text}</span>;
   }
   if (node.type === 'mention') {
+    const displayName = resolveName(node.mentionType, node.id, node.label);
     return (
       <span key={index} className={mentionStyles[node.mentionType] ?? mentionStyles.user}>
-        @{node.label}
+        @{displayName}
       </span>
     );
   }
@@ -140,6 +153,9 @@ function renderNode(node: Node, index: number): React.ReactNode {
  */
 export const MessageContentWithMentions = memo(function MessageContentWithMentions({
   content,
+  members = [],
+  repos = [],
+  aiConfigs = [],
 }: MessageContentWithMentionsProps) {
   const nodes = useMemo(() => {
     // Try the new AST parser first (handles <mention> and <ai> tags)
@@ -172,6 +188,26 @@ export const MessageContentWithMentions = memo(function MessageContentWithMentio
     return parts;
   }, [content]);
 
+  // Resolve ID → display name for each mention type
+  const resolveName = useCallback(
+    (type: string, id: string, label: string): string => {
+      if (type === 'user') {
+        const member = members.find((m) => m.user === id);
+        return member?.user_info?.username ?? member?.user ?? label;
+      }
+      if (type === 'repository') {
+        const repo = repos.find((r) => r.uid === id);
+        return repo?.repo_name ?? label;
+      }
+      if (type === 'ai') {
+        const cfg = aiConfigs.find((c) => c.model === id);
+        return cfg?.modelName ?? cfg?.model ?? label;
+      }
+      return label;
+    },
+    [members, repos, aiConfigs],
+  );
+
   return (
     <div
       className={cn(
@@ -181,7 +217,7 @@ export const MessageContentWithMentions = memo(function MessageContentWithMentio
         '[&_pre]:rounded-md [&_pre]:bg-muted [&_pre]:p-3 [&_pre]:overflow-x-auto',
       )}
     >
-      {nodes.map((node, i) => renderNode(node, i))}
+      {nodes.map((node, i) => renderNode(node, i, resolveName))}
     </div>
   );
 });

src/components/room/RoomMessageBubble.tsx

@@ -92,7 +92,7 @@ export const RoomMessageBubble = memo(function RoomMessageBubble({
   const isStreaming = !!message.is_streaming;
   const isEdited = !!message.edited_at;
   const { user } = useUser();
-  const { wsClient, streamingMessages } = useRoom();
+  const { wsClient, streamingMessages, members, projectRepos, roomAiConfigs } = useRoom();
   const isOwner = user?.uid === getSenderUserUid(message);
   const isRevoked = !!message.revoked;
   const isFailed = message.isOptimisticError === true;
@@ -315,7 +315,12 @@ export const RoomMessageBubble = memo(function RoomMessageBubble({
                           ))
                         ) : (
                           <div className="max-w-full min-w-0 overflow-hidden whitespace-pre-wrap break-words">
-                            <MessageContentWithMentions content={displayContent} />
+                            <MessageContentWithMentions
+                              content={displayContent}
+                              members={members}
+                              repos={projectRepos}
+                              aiConfigs={roomAiConfigs}
+                            />
                           </div>
                         )}