Disable analytics in dev env, redirect to edit page after event update

- Skip loading /stats/script.js and /assets/perf.js when data-env=dev
- Add data-env="{{ app.environment }}" to body tag
- Redirect to edit event page instead of events list after saving

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Controller/AccountController.php

@@ -362,7 +362,7 @@ class AccountController extends AbstractController
 
             $this->addFlash('success', 'Evenement modifie avec succes.');
 
-            return $this->redirectToRoute('app_account', ['tab' => 'events']);
+            return $this->redirectToRoute('app_account_edit_event', ['id' => $event->getId()]);
         }
 
         return $this->render('account/edit_event.html.twig', [