Fix login glitch where user session wouldn't load properly into context

contexts/userContext.ts

@@ -1,11 +1,13 @@
 import GetUserSchema from '@/services/User/schema/GetUserSchema';
 import { createContext } from 'react';
+import { KeyedMutator } from 'swr';
 import { z } from 'zod';
 
 const UserContext = createContext<{
   user?: z.infer<typeof GetUserSchema>;
   error?: unknown;
   isLoading: boolean;
+  mutate?: KeyedMutator<z.infer<typeof GetUserSchema>>;
 }>({ isLoading: true });
 
 export default UserContext;