perf: defer initial data fetching to microtasks and update loading placeholders for smoother screen transitions

lib/features/agents/presentation/providers/agent_detail_provider.dart

@@ -449,7 +449,10 @@ class AgentDetailNotifier extends StateNotifier<AgentDetailState> {
 
   AgentDetailNotifier(this._repo, this.agentId)
       : super(const AgentDetailState()) {
-    _load();
+    // Defer the network burst to the next microtask so the agent detail
+    // screen's first frame (loading placeholder) paints before the three
+    // parallel HTTP requests kick off — smoother slide-in transition.
+    Future.microtask(_load);
     // Listen for real-time connection response (accepted/rejected)
     _connectionResponseSub =
         SocketService().onConnectionResponse.listen((_) {