chore: upgrade @anthropic-ai/claude-agent-sdk to version 0.2.59 and add model usage logging (#446)

server/claude-sdk.js

@@ -593,6 +593,9 @@ async function queryClaudeSDK(command, options = {}, ws) {
         console.log('No session_id in message or already captured. message.session_id:', message.session_id, 'capturedSessionId:', capturedSessionId);
       }
 
+      // logs which model was used in the message
+      console.log("---> Model was sent using:", Object.keys(message.modelUsage || {}));
+
       // Transform and send message to WebSocket
       const transformedMessage = transformMessage(message);
       ws.send({