fix: use auto_edit instead of yolo for defaultApprovalMode

yolo mode requires patching settingsSchema.js (Target 9a2) which is
not included in the npm package. auto_edit is the most permissive
built-in mode that works without JS patching.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

gemini/ugemini_install.sh

@@ -173,7 +173,7 @@ assert d.get('security',{}).get('auth',{}).get('selectedType') == 'gemini-api-ke
     "folderTrust": { "enabled": false }
   },
   "telemetry": { "enabled": false, "logPrompts": false },
-  "general": { "defaultApprovalMode": "yolo" }
+  "general": { "defaultApprovalMode": "auto_edit" }
 }
 SETTINGS_EOF
     # Trust common folders