metrics page: rename Point Cloud F1 -> Surface Distance F1

Match the renamed shape metric and describe it as point-to-surface
(closest point on the other mesh), not nearest point on the other cloud.

Co-authored-by: Cursor <cursoragent@cursor.com>

metrics_page.py

@@ -215,15 +215,15 @@ def build_metrics_page() -> str:
             "<p>Does the bulk geometry match? The mean of two complementary "
             "sub-metrics, each in [0, 1]:</p>"
             '<pre class="formula">'
-            "shape_similarity = 0.5 * (point_cloud_F1 + volume_IoU)"
+            "shape_similarity = 0.5 * (surface_distance_F1 + volume_IoU)"
             "</pre>"
-            "<h3>Point-cloud F1</h3>"
+            "<h3>Surface Distance F1</h3>"
             "<p>Checks the candidate's surface sits where the GT's does and "
             "faces the same way. Points are sampled across both surfaces with "
-            "their outward normals; a point matches when the nearest point on "
-            "the other surface is within 0.5% of the GT bounding-box diagonal "
-            "<b>and</b> the normals agree to within 20°. Precision and recall "
-            "combine into F1.</p>"
+            "their outward normals; a point matches when the closest point on "
+            "the other mesh's surface is within 0.5% of the GT bounding-box "
+            "diagonal <b>and</b> the normals agree to within 20°. Precision and "
+            "recall combine into F1.</p>"
             "<h3>Volume IoU</h3>"
             "<p>Shared volume of the two solids over their combined volume "
             "(intersection over union).</p>"