feat(test): Add comprehensive unit tests for all Rails models

- Create detailed unit tests for Party, TicketType, Ticket, User, and ApplicationRecord models
- Add fixture files for all models with valid test data
- Fix enum syntax in Party model for Rails 8 compatibility
- Add 60 total model tests covering validations, associations, and business logic
- Ensure all tests pass successfully

This provides full test coverage for the application's data models.

test/models/user_test.rb

@@ -1,7 +1,28 @@
 require "test_helper"
 
 class UserTest < ActiveSupport::TestCase
-  # test "the truth" do
-  #   assert true
-  # end
-end
+  # Test that User model exists
+  test "should be a class" do
+    assert_kind_of Class, User
+  end
+
+  # Test Devise modules
+  test "should include devise modules" do
+    user = User.new
+    assert user.respond_to?(:email)
+    assert user.respond_to?(:encrypted_password)
+  end
+
+  # Test associations
+  test "should have many parties" do
+    association = User.reflect_on_association(:parties)
+    assert_equal :has_many, association.macro
+    assert_equal :destroy, association.options[:dependent]
+  end
+
+  test "should have many tickets" do
+    association = User.reflect_on_association(:tickets)
+    assert_equal :has_many, association.macro
+    assert_equal :destroy, association.options[:dependent]
+  end
+end