Update app.py

app.py

@@ -56,6 +56,16 @@ design_files = st.file_uploader("Upload design files", type=["png", "jpg", "jpeg
 st.header("Upload templates.json (coordinates of print area)")
 templates_file = st.file_uploader("Upload templates.json", type=["json"])
 
+# 例: サイドバーにヘッダー付きで置く
+st.sidebar.header("Utilities")
+st.sidebar.markdown(
+    '<a href="./+/coordinatemaker.html" target="_blank">'
+    'Open Coordinate Maker ↗</a>',
+    unsafe_allow_html=True
+)
+
+
+
 # --- ファイル保存
 bases_paths, designs_paths = [], []
 if bases_files: