fix(agent): restore MCP wait timeout and fix direct URL navigation

- Restore 50-second self-imposed timeout for agent wait operations in MCP
  server. Returns friendly message instead of letting SDK timeout trigger
  generic "tool failed" error that confuses orchestrator agents.

- Fix direct URL navigation to agent screens by waiting for WebSocket
  connection before initializing. Previously, init would fire before WS
  connected, fail silently, and never retry due to guard ref.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/app/src/app/agent/[serverId]/[agentId].tsx

@@ -438,6 +438,11 @@ function AgentScreenContent({
       return;
     }
 
+    // Skip if not connected - will re-run when connection is established
+    if (!ws?.isConnected) {
+      return;
+    }
+
     // Skip if already initializing
     if (isInitializingFromMap === true) {
       return;
@@ -459,7 +464,7 @@ function AgentScreenContent({
     });
 
     initializeAgent({ agentId: resolvedAgentId });
-  }, [resolvedAgentId, initializeAgent, isInitializingFromMap]);
+  }, [resolvedAgentId, initializeAgent, isInitializingFromMap, ws?.isConnected]);
 
   useEffect(() => {
     if (Platform.OS !== "web") {