Update chat agent and checkpoint settings

Added 'chat.agent.thinkingStyle' and 'chat.checkpoints.showFileChanges' options to settings.json to enhance chat agent behavior and checkpoint visibility.

settings.json

@@ -44,6 +44,8 @@
   // "C_Cpp.intelliSenseEngine": "disabled",
   "CangjieSdkPath.CJNativeBackend": "D:\\cangjie",
   "chat.agent.maxRequests": 1e99,
+  "chat.agent.thinkingStyle": "collapsedPreview",
+  "chat.checkpoints.showFileChanges": true,
   "chat.editing.confirmEditRequestRemoval": false,
   "chat.mcp.autostart": "newAndOutdated",
   "chat.mcp.discovery.enabled": {