feat: support concurrent Reddit accounts

tests/dashboard/conversations.test.tsx

@@ -54,7 +54,10 @@ function detailFixture(chat = alice) {
   };
 }
 
-const server = setupServer();
+const server = setupServer(http.get('/api/accounts', () => HttpResponse.json([{
+  accountId: '@t2_bot:reddit.com', redditUsername: 'bot-account', matrixUserId: '@t2_bot:reddit.com',
+  isRunning: true, status: 'authenticated', createdAt: 1, updatedAt: 2, lastImportedAt: 2,
+}])));
 
 function installConversationList() {
   server.use(