Fix 500 on product create: remove $arguments from render-time closures

In Filament v3, $arguments is only injected when an action is executed
(clicked), not when it's rendered. Using $arguments in label(), icon(),
color() and visible() closures causes ErrorException: Undefined variable
$arguments on every Livewire update, including on the create page.

Simplified extraItemAction to static label/icon/color; all dynamic
logic (publish vs sync, guard for unsaved items) stays in action().

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

app/Filament/User/Resources/ProductResource.php

@@ -155,23 +155,18 @@ class ProductResource extends Resource {
                     ->addActionLabel('Option hinzufügen')
                     ->extraItemActions([
                         FormAction::make('shopify')
-                            ->label(fn (array $arguments, Repeater $component): string =>
-                                ($component->getState()[$arguments['item']]['shopify_variant_id'] ?? null)
-                                    ? 'Shopify sync' : 'Zu Shopify'
-                            )
-                            ->icon(fn (array $arguments, Repeater $component): string =>
-                                ($component->getState()[$arguments['item']]['shopify_variant_id'] ?? null)
-                                    ? 'heroicon-o-arrow-path' : 'heroicon-o-arrow-up-tray'
-                            )
-                            ->color(fn (array $arguments, Repeater $component): string =>
-                                ($component->getState()[$arguments['item']]['shopify_variant_id'] ?? null)
-                                    ? 'info' : 'warning'
-                            )
+                            ->label('Shopify')
+                            ->icon('heroicon-o-arrow-path')
+                            ->color('gray')
                             ->requiresConfirmation()
                             ->action(function (array $arguments, Repeater $component): void {
                                 $item   = $component->getState()[$arguments['item']] ?? [];
                                 $sizeId = (int) ($item['product_size_id'] ?? 0);
                                 if (! $sizeId) {
+                                    \Filament\Notifications\Notification::make()
+                                        ->title('Zuerst speichern')
+                                        ->warning()
+                                        ->send();
                                     return;
                                 }
                                 $page = $component->getContainer()->getLivewire();
@@ -180,10 +175,7 @@ class ProductResource extends Resource {
                                 } else {
                                     $page->publishVariantToShopify($sizeId);
                                 }
-                            })
-                            ->visible(fn (array $arguments, Repeater $component): bool =>
-                                ! empty($component->getState()[$arguments['item']]['product_size_id'] ?? null)
-                            ),
+                            }),
                     ])
                     ->afterStateHydrated(function ($state, $set, $record) {
                         if ($record) {