Mijn aanvragen: list enter/leave animations + 204 null-body fix

- animate.enter/leave on aanvraag cards and upload rows (native Angular, no @angular/animations)
- reduced-motion: skip animation → instant removal
- api-client: null-body statuses (204/205/304) must pass null to Response()

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/registratie/ui/dashboard.page.ts

@@ -39,7 +39,7 @@ import { tasksFromProfile } from '@registratie/domain/tasks';
               <app-heading [level]="2" i18n="@@dashboard.mijnAanvragen">Mijn aanvragen</app-heading>
               <div class="app-stack app-section">
                 @for (a of aanvragen(); track a.id) {
-                  <app-aanvraag-block [aanvraag]="a" (resume)="resume(a)" (cancel)="cancelAanvraag(a)" />
+                  <app-aanvraag-block animate.enter="app-item-enter" animate.leave="app-item-leave" [aanvraag]="a" (resume)="resume(a)" (cancel)="cancelAanvraag(a)" />
                 }
               </div>
             </section>

src/app/shared/infrastructure/api-client.provider.ts

@@ -40,7 +40,9 @@ function httpClientFetch(http: HttpClient) {
             })
             .pipe(timeout(REQUEST_TIMEOUT_MS)),
         );
-        return new Response(res.body ?? '', { status: res.status || 200 });
+        // 204/205/304 are null-body statuses — new Response(body, …) throws for any non-null body.
+        const nullBody = res.status === 204 || res.status === 205 || res.status === 304;
+        return new Response(nullBody ? null : (res.body ?? ''), { status: res.status || 200 });
       } catch (e) {
         if (e instanceof TimeoutError) return new Response('', { status: 504 });
         const err = e as HttpErrorResponse;

src/app/shared/ui/upload/document-category/document-category.component.ts

@@ -50,6 +50,8 @@ import { SingleUploadComponent } from '../single-upload/single-upload.component'
       <div class="uploads">
         @for (u of uploads(); track u.localId) {
           <app-single-upload
+            animate.enter="app-item-enter"
+            animate.leave="app-item-leave"
             [upload]="u"
             [previewUrlFor]="previewUrlFor()"
             (remove)="onRemove(u)"