improve user email validation

spec/system/profile_settings_spec.rb

@@ -33,6 +33,14 @@ RSpec.describe 'Profile Settings' do
       expect(user.last_name).to eq('Beckham')
       expect(user.email).to eq('david.beckham@example.com')
     end
+
+    it 'does not update if email is invalid' do
+      fill_in 'Email', with: 'devid+test@example'
+
+      all(:button, 'Update')[0].click
+
+      expect(page).to have_content('Email is invalid')
+    end
   end
 
   context 'when changes password' do