fix: force favicon refresh via /favicon.ico

app.py

@@ -252,11 +252,13 @@ def health():
 
 @app.route("/favicon.ico")
 def favicon():
-    return send_from_directory(
+    response = send_from_directory(
         app.static_folder,
         "img/favicon.png",
         mimetype="image/png",
     )
+    response.headers["Cache-Control"] = "no-store, max-age=0"
+    return response
 
 
 if __name__ == "__main__":