Refactor auth.utils.ts

Refactor auth.utils.ts into smaller modules for better organization and maintainability. Split functions into networkUtils.ts, responseUtils.ts, and toastUtils.ts based on their purpose.

src/contexts/auth/signIn.ts

@@ -1,6 +1,10 @@
-
 import { supabase } from '@/lib/supabase';
-import { handleNetworkError, parseResponse, showAuthToast, verifyServerConnection } from './auth.utils';
+import { 
+  handleNetworkError, 
+  parseResponse, 
+  showAuthToast, 
+  verifyServerConnection 
+} from '@/utils/auth';
 
 export const signIn = async (email: string, password: string) => {
   try {