use universal cookies

reflex/.templates/web/utils/state.js

@@ -112,12 +112,9 @@ export const getBackendURL = (url_str) => {
  * @returns True if the backend is disabled, false otherwise.
  */
 export const isBackendDisabled = () => {
-  const cookie = document.cookie
-    .split("; ")
-    .find((row) => row.startsWith("backend-enabled="));
-  return cookie !== undefined && cookie.split("=")[1] == "false";
+  const backendEnabled = cookies.get("backend-enabled");
+  return backendEnabled === "false";
 };
-
 /**
  * Determine if any event in the event queue is stateful.
  *

reflex/components/core/banner.py

@@ -4,6 +4,7 @@ from __future__ import annotations
 
 from typing import Optional
 
+from reflex import constants
 from reflex.components.component import Component
 from reflex.components.core.cond import cond
 from reflex.components.datadisplay.logo import svg_logo
@@ -318,7 +319,9 @@ class BackendDisabled(Div):
                     "useEffect(() => { setBackendDisabled(isBackendDisabled()); }, []);": None,
                 },
                 imports={
-                    f"$/{constants.Dirs.STATE_PATH}": [ImportVar(tag="isBackendDisabled")],
+                    f"$/{constants.Dirs.STATE_PATH}": [
+                        ImportVar(tag="isBackendDisabled")
+                    ],
                 },
             ),
         )