Update xuanchen annotations

xuanchen.json

@@ -2925,17 +2925,17 @@
     "timestamp": "2026-04-11T08:23:06.373345"
   },
   "annotated_frame_fancap_58": {
-    "tip_x": 7.5,
-    "tip_y": 63.8,
+    "tip_x": 10.5,
+    "tip_y": 64.8,
     "crop_x1": 321,
     "crop_y1": 239,
     "crop_w": 43,
     "crop_h": 75,
     "img_w": 640,
     "img_h": 480,
-    "full_x": 328.5,
-    "full_y": 302.8,
-    "timestamp": "2026-04-11T08:23:08.796086"
+    "full_x": 331.5,
+    "full_y": 303.8,
+    "timestamp": "2026-04-11T08:23:25.455828"
   },
   "annotated_frame_fancap_63": {
     "skipped": true,