Normalize email to lowercase when logging in

lib/pages/auth/bloc/auth_bloc.dart

@@ -161,7 +161,7 @@ class AuthBloc extends Bloc<AuthEvent, AuthState> {
 
         token = await AuthenticationAPI.loginWithEmail(
           model: LoginWithEmailModel(
-            email: event.username,
+            email: event.username.toLowerCase(),
             password: event.password,
           ),
         );