fix: avoid duplicate pixel office agent labels

docs/test.txt

@@ -1,10 +0,0 @@
-  curl https://gpt.qt.cool/v1/chat/completions \
-    -H "Content-Type: application/json" \
-    -H "Authorization: Bearer sk-qt-cool-rAesCG1982qKfefUDoKa2zREJMkMTDMY" \
-    -d '{
-      "model": "gpt-5.3-codex",
-      "messages": [
-        {"role": "user", "content": "hi"}
-      ],
-      "max_tokens": 16
-    }'

lib/pixel-office/agentBridge.ts

@@ -66,10 +66,13 @@ export function syncAgentsToOffice(
       office.addAgent(charId, undefined, undefined, undefined, undefined, wasOffline || isNew)
     }
 
-    // Set label (agent name with id in parentheses)
+    // Set label, avoiding duplicated values like "main (main)"
     const ch = office.characters.get(charId)
     if (ch) {
-      ch.label = activity.name ? `${activity.name} (${activity.agentId})` : activity.agentId
+      const displayName = activity.name?.trim()
+      ch.label = displayName && displayName !== activity.agentId
+        ? `${displayName} (${activity.agentId})`
+        : activity.agentId
     }
 
     switch (activity.state) {