feat(auth): enhance user registration with names and improve UI

- Add first_name and last_name fields to User model with validations
- Configure Devise registrations controller to accept name parameters
- Update registration form with name fields and improved styling
- Replace Twitter Bootstrap pagination with custom Tailwind components
- Add French locale translations for pagination and models
- Update header styling with responsive design improvements
- Add EditorConfig for consistent code formatting
- Fix logout controller URL handling and improve JavaScript
- Update seed data and test fixtures with name attributes
- Add comprehensive model tests for name validations
- Add test.sh script for easier test execution

💘 Generated with Crush
Co-Authored-By: Crush <crush@charm.land>

app/models/user.rb

@@ -22,4 +22,8 @@ class User < ApplicationRecord
   # Relationships
   has_many :parties, dependent: :destroy
   has_many :tickets, dependent: :destroy
+
+  # Validations
+  validates :last_name,   length: { minimum: 3, maximum: 12, allow_blank: true }
+  validates :first_name,  length: { minimum: 3, maximum: 12, allow_blank: true }
 end