fix: Update event flow to use new event-scoped order routes

- Update events/show form to use event_order_new_path instead of order_new_path
- Fix JavaScript redirect in ticket_selection_controller.js to use event-scoped URL
- Ensure proper event context is maintained throughout the order flow
- Resolve routing issues that caused "Commande non trouvée" errors

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/javascript/controllers/ticket_selection_controller.js

@@ -117,8 +117,8 @@ export default class extends Controller {
       // Store cart data in session
       await this.storeCartInSession(cartData);
 
-      // Redirect to orders/new page
-      const OrderNewUrl = `/orders/new`;
+      // Redirect to event-scoped orders/new page
+      const OrderNewUrl = `/events/${this.eventSlugValue}.${this.eventIdValue}/orders/new`;
       window.location.href = OrderNewUrl;
     } catch (error) {
       console.error("Error storing cart:", error);