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>

db/seeds.rb

@@ -12,6 +12,8 @@
 admin_user = User.find_or_create_by!(email: 'admin@example.com') do |u|
   u.password = 'password'
   u.password_confirmation = 'password'
+  u.last_name = nil
+  u.first_name = nil
 end
 
 # Create regular users for development
@@ -21,6 +23,8 @@ missing_users_count.times do |i|
   User.find_or_create_by!(email: "user#{i + 1}@example.com") do |u|
     u.password = 'password'
     u.password_confirmation = 'password'
+    u.last_name = nil
+    u.first_name = nil
   end
 end