:sparkless: add auth persistance

src/auth/AuthProvider.tsx

 import React from 'react';
 
 import { AuthContext } from './AuthContext';
+import { bake_cookie, delete_cookie } from 'sfcookies';
 
 const fakeAuthProvider = {
 	isAuthenticated: false,
@@ -20,6 +21,7 @@ function AuthProvider({ children }: { children: React.ReactNode }) {
 	let signin = (newUser: string, callback: VoidFunction) => {
 		return fakeAuthProvider.signin(() => {
 			setUser(newUser);
+			bake_cookie('user', newUser);
 			callback();
 		});
 	};
@@ -27,6 +29,7 @@ function AuthProvider({ children }: { children: React.ReactNode }) {
 	let signout = (callback: VoidFunction) => {
 		return fakeAuthProvider.signout(() => {
 			setUser(null);
+			delete_cookie('user');
 			callback();
 		});
 	};