Use chemiscope.org viewer for artifacts

app.py

@@ -319,18 +319,16 @@ def _build_chemiscope_embed(dataset_payload: dict, dataset_path: str | Path) ->
     viewer_path = dataset_file.parent / viewer_name
     viewer_path.write_text(combined, encoding="utf-8")
 
-    view_rel_path = f"/file={urllib.parse.quote(viewer_path.as_posix())}"
-    space_origin = _infer_space_origin()
-    iframe_src = f"{space_origin}{view_rel_path}" if space_origin else view_rel_path
+    view_rel_path = viewer_path.as_posix()
     return (
         "<div style='width:100%;'>"
         "<iframe "
         "title='Chemiscope explorer' "
         "style='width:100%;height:620px;border:none;border-radius:8px;' "
-        f"src='{iframe_src}'></iframe>"
+        f"src='https://chemiscope.org/?load={urllib.parse.quote(view_rel_path)}'></iframe>"
         "<p style='font-size:0.9em;margin-top:0.5rem;'>"
         "Open in a new tab if the viewer looks blank: "
-        f"<a href='{iframe_src}' target='_blank' rel='noopener'>Chemiscope standalone</a>"
+        f"<a href='https://chemiscope.org/?load={urllib.parse.quote(view_rel_path)}' target='_blank' rel='noopener'>Chemiscope standalone</a>"
         "</p>"
         "</div>"
     )