Insert navigation messages when agent finishes working (after tool execution)

- Track agent busy state: isStreaming OR pendingToolCalls.size > 0
- When agent transitions from busy to idle, check for URL changes
- Extract checkAndInsertNavMessage() helper function
- Call helper from both onBeforeSend (user submit) and agent state subscription (post-tool)
- Fixes issue where browser_javascript tool navigates page but no nav message inserted
- Navigation messages now appear after tools that change window.location.href

packages/web-ui/src/agent/agent.ts

@@ -293,10 +293,10 @@ export class Agent {
 			this.patch({ isStreaming: false, streamMessage: null, pendingToolCalls: new Set<string>() });
 			this.abortController = undefined;
 		}
-		{
+		/*{
 			const { systemPrompt, model, messages } = this._state;
 			console.log("final state:", { systemPrompt, model, messages });
-		}
+		}*/
 	}
 
 	private patch(p: Partial<AgentState>): void {