## Backend Implementation

Enhanced TicketType model with helper methods and better validations

So the full context is:

## Backend Implementation
- Enhanced TicketType model with helper methods and better validations
- New Promoter::TicketTypesController with full authorization
- Sales status tracking (draft, available, upcoming, expired, sold_out)
- New Promoter::TicketTypesController with full authorization
- Safe calculation methods preventing nil value errors
- Sales status tracking (draft, available, upcoming, expired, sold_out)

## Frontend Features
- Modern responsive UI with Tailwind CSS styling
- Interactive forms with Stimulus controller for dynamic calculations
- Revenue calculators showing potential, current, and remaining revenue
- Status indicators with appropriate colors and icons
- Buyer analytics and purchase history display

## JavaScript Enhancements
- New TicketTypeFormController for dynamic pricing calculations
- Real-time total updates as users type price/quantity
- Proper French currency formatting
- Form validation for minimum quantities based on existing sales

## Bug Fixes
 Fixed nil value errors in price_euros method when price_cents is nil
 Added defensive programming for all calculation methods
 Graceful handling of incomplete ticket types during creation
 Proper default values for new ticket type instances

## Files Added/Modified
- app/controllers/promoter/ticket_types_controller.rb (new)
- app/javascript/controllers/ticket_type_form_controller.js (new)
- app/views/promoter/ticket_types/*.html.erb (4 new view files)
- app/models/ticket_type.rb (enhanced with helper methods)
- config/routes.rb (added nested ticket_types routes)
- db/migrate/*_add_requires_id_to_ticket_types.rb (new migration)

## Integration
- Seamless integration with existing event management system
- Updated promoter event show page with ticket management link
- Proper scoping ensuring promoters only manage their own tickets
- Compatible with existing ticket purchasing and checkout flow

app/views/promoter/events/show.html.erb

@@ -209,9 +209,9 @@
       <div class="bg-white rounded-lg border border-gray-200 p-6">
         <h3 class="text-lg font-semibold text-gray-900 mb-4">Actions rapides</h3>
         <div class="space-y-3">
-          <%= link_to "#", class: "w-full inline-flex items-center px-4 py-2 bg-gray-50 text-gray-700 font-medium rounded-lg hover:bg-gray-100 transition-colors duration-200" do %>
+          <%= link_to promoter_event_ticket_types_path(@event), class: "w-full inline-flex items-center px-4 py-2 bg-purple-600 text-white font-medium rounded-lg hover:bg-purple-700 transition-colors duration-200" do %>
             <i data-lucide="ticket" class="w-4 h-4 mr-2"></i>
-            Gérer les billets
+            Gérer les types de billets
           <% end %>
           <%= button_to mark_sold_out_promoter_event_path(@event), method: :patch, class: "w-full inline-flex items-center px-4 py-2 bg-gray-50 text-gray-700 font-medium rounded-lg hover:bg-gray-100 transition-colors duration-200", disabled: !@event.published? do %>
             <i data-lucide="users" class="w-4 h-4 mr-2"></i>