fixd larg lines in HomePage , add cookies rather than localStorage,make canvas background Login page

app/contexts/ThemeContext.js

@@ -5,7 +5,7 @@ import { createContext, useContext, useState, useEffect } from "react";
 const ThemeContext = createContext();
 
 export function ThemeProvider({ children }) {
-  const [theme, setTheme] = useState("light");
+  const [theme, setTheme] = useState("dark");
 
   useEffect(() => {
     const stored = localStorage.getItem("theme");