remove unnecessary code & enhance gray color over the app

src/routes/routes.tsx

@@ -17,7 +17,6 @@ import SearchPage from "pages/search/page";
 import SplitBillPage from "pages/split-bill/page";
 import React, { ReactNode, Suspense, useEffect } from "react";
 import { createHashRouter, useLocation } from "react-router-dom";
-import { SignInPage } from "../pages/authentication";
 import { Error400Page, ErrorPage } from "../pages/errors";
 
 const { useBreakpoint } = Grid;
@@ -148,16 +147,6 @@ export const router = createHashRouter([
     errorElement: <ErrorPage />,
   },
 
-  {
-    path: "/auth",
-    errorElement: <ErrorPage />,
-    children: [
-      {
-        path: "signin",
-        element: <SignInPage />, // No PrivateRoute for sign-in
-      },
-    ],
-  },
   {
     path: "errors",
     errorElement: <ErrorPage />,