Fix auth form errors and redirects: Add React keys/useEffects for error rendering and scroll, Inertia::location in controllers for SPA navigation, extend RegistrationTest and add E2E. Update docs (changes/2025-10-02-registration-fixes.md, prp/13-backend-authentication.md). Add new UI components (accordion, carousel, progress, table, tabs), marketing/legal pages (Blog, Kontakt, Datenschutz, etc.), fonts, user migration (remove_name), views/css/package updates, seeders/factories.

app/Exceptions/Handler.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Exceptions;
+
+use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;
+use Throwable;
+use Illuminate\Validation\ValidationException;
+use Inertia\Inertia;
+
+class Handler extends ExceptionHandler
+{
+    /**
+     * The list of the inputs that are never flashed to the session on validation exceptions.
+     *
+     * @var array<int, string>
+     */
+    protected $dontFlash = [
+        'current_password',
+        'password',
+        'password_confirmation',
+    ];
+
+    /**
+     * Register the exception handling callbacks for the application.
+     */
+    public function register(): void
+    {
+        $this->reportable(function (Throwable $e) {
+            //
+        });
+    }
+
+    public function render($request, Throwable $e)
+    {
+        \Illuminate\Support\Facades\Log::info('Handler render called', ['inertia' => $request->inertia(), 'exception' => get_class($e)]);
+        if ($request->inertia()) {
+            if ($e instanceof ValidationException) {
+                \Illuminate\Support\Facades\Log::info('ValidationException in Inertia', ['errors' => $e->errors()]);
+                return response()->json([
+                    'message' => 'The given data was invalid.',
+                    'errors' => $e->errors(),
+                ], 422)->header('X-Inertia-Error', 'true');
+            }
+
+            if ($e instanceof \Exception) {
+                \Illuminate\Support\Facades\Log::info('Exception in Inertia', ['message' => $e->getMessage()]);
+                return response()->json([
+                    'message' => 'Registrierung fehlgeschlagen.',
+                    'errors' => ['general' => $e->getMessage()],
+                ], 500)->header('X-Inertia-Error', 'true');
+            }
+        }
+
+        return parent::render($request, $e);
+    }
+}