feat: add agent_type field and support Agent tool rename from CLI v2.1.69

- Parse agent_type from SubagentStart hook events and forward via claude:agent-update
- Support renamed Agent/Agent(type) tool alongside existing Task/Task(type) syntax
- Fall back to prompt field when description is absent in Agent tool input
- Display agentType (with subagentType fallback) in agent monitor badge
- Show agentId as tooltip on the type badge when available

src/lib/tauri.ts

@@ -538,9 +538,10 @@ export async function initializeTauriListeners() {
     conversationId: string;
     toolUseId: string;
     agentId: string;
+    agentType?: string;
   }>("claude:agent-update", (event) => {
-    const { conversationId, toolUseId, agentId } = event.payload;
-    agentStore.updateAgentId(conversationId, toolUseId, agentId);
+    const { conversationId, toolUseId, agentId, agentType } = event.payload;
+    agentStore.updateAgentId(conversationId, toolUseId, agentId, agentType);
   });
   unlisteners.push(agentUpdateUnlisten);