feat(shared): sendEncryptedMessage inserts mention rows after the message row

packages/shared/src/chat/messages.ts

@@ -8,6 +8,7 @@ import {
   type OwnUserCtx,
   tryGetConvKey,
 } from './convKeys';
+import { insertMentions, makeMentionResolver, parseMentionUsernames } from './mentions';
 import type { ChatMessage, DecryptedMessage } from './types';
 
 const MESSAGE_COLS =
@@ -146,6 +147,28 @@ export async function sendEncryptedMessage(params: SendMessageParams): Promise<C
     .select(MESSAGE_COLS)
     .single();
   if (insertErr) throw insertErr;
+
+  // Mention rows are inserted on a best-effort basis after the message itself
+  // lands. If parsing or resolution fails the message still goes through —
+  // worst case the mentioned user doesn't get a notification.
+  const usernames = parseMentionUsernames(params.plaintext);
+  if (usernames.length > 0) {
+    try {
+      const resolver = makeMentionResolver(params.client);
+      const resolved = await resolver.resolveUsernames(params.conversationId, usernames);
+      if (resolved.size > 0) {
+        await insertMentions(
+          params.client,
+          (messageRow as unknown as { id: string }).id,
+          params.conversationId,
+          [...resolved.values()],
+        );
+      }
+    } catch (err) {
+      console.warn('mention insert failed', err);
+    }
+  }
+
   return mapMessage(messageRow as unknown as MessageRow);
 }