Update chao annotations

chao.json

@@ -7977,5 +7977,18 @@
     "full_x": 530.5,
     "full_y": 141.5,
     "timestamp": "2026-04-12T20:08:36.130444"
+  },
+  "annotated_frame_y521": {
+    "tip_x": 13,
+    "tip_y": 37.5,
+    "crop_x1": 273,
+    "crop_y1": 192,
+    "crop_w": 42,
+    "crop_h": 63,
+    "img_w": 640,
+    "img_h": 480,
+    "full_x": 286,
+    "full_y": 229.5,
+    "timestamp": "2026-04-12T20:08:39.390242"
   }
 }