fix(bio): prevent page scroll-jump on slug check (#[Renderless])

.checkSlug() triggered Livewire re-render on every keystroke,
causing the editor to scroll to top. #[Renderless] skips re-render
while still returning the bool result to Alpine.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Livewire/Pages/Bio/Edit.php

@@ -5,6 +5,7 @@ namespace App\Livewire\Pages\Bio;
 use App\Domains\Bio\Models\BioBlock;
 use App\Domains\Bio\Models\BioPage;
 use Illuminate\View\View;
+use Livewire\Attributes\Renderless;
 use Livewire\Component;
 
 class Edit extends Component
@@ -90,6 +91,7 @@ class Edit extends Component
         $this->dispatch('toast', message: 'Gespeichert', type: 'success');
     }
 
+    #[Renderless]
     public function checkSlug(string $slug): bool
     {
         $page = BioPage::findOrFail($this->pageId);