Fix barcode 500 error, GTIN mask formatting, and add price sync

- Wrap barcode generation in try-catch to prevent 500 on invalid GTIN
- Move barcode preview above GTIN input field
- Add input mask (X XXXXXX XXXXXX) and strip non-digits before save/render
- Only render barcode when >= 8 digits present
- shopify:sync now updates price alongside inventory

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

app/Console/Commands/ShopifySync.php

@@ -35,6 +35,11 @@ class ShopifySync extends Command
                     continue; // not mapped yet — run shopify:map first
                 }
 
+                // Preis immer aktualisieren
+                if (! $dryRun && $size->price != $variant['price']) {
+                    $size->update(['price' => $variant['price']]);
+                }
+
                 $shopifyQty = $variant['inventory_quantity'];
                 $localQty   = ProductInventory::where('size_id', $size->id)
                     ->whereNull('out_at')

app/Filament/User/Resources/ProductResource.php

@@ -70,14 +70,11 @@ class ProductResource extends Resource {
                             ->required(),
                         TextInput::make('sku')
                             ->label('SKU'),
-                        TextInput::make('gtin')
-                            ->label('GTIN')
-                            ->live(debounce: 500),
                         Placeholder::make('barcode_preview')
                             ->label('Barcode')
                             ->content(function (Get $get): HtmlString {
-                                $gtin = trim((string) $get('gtin'));
-                                if (empty($gtin)) {
+                                $gtin = preg_replace('/\D/', '', (string) $get('gtin'));
+                                if (strlen($gtin) < 8) {
                                     return new HtmlString('');
                                 }
                                 $type = match (strlen($gtin)) {
@@ -87,11 +84,20 @@ class ProductResource extends Resource {
                                     14 => BarcodeGeneratorSVG::TYPE_CODABAR,
                                     default => BarcodeGeneratorSVG::TYPE_CODE_128,
                                 };
+                                try {
                                     $svg = (new BarcodeGeneratorSVG())->getBarcode($gtin, $type, 2, 60);
                                     return new HtmlString($svg);
+                                } catch (\Throwable) {
+                                    return new HtmlString('');
+                                }
                             })
                             ->columnSpanFull()
-                            ->visible(fn (Get $get) => filled($get('gtin'))),
+                            ->visible(fn (Get $get) => strlen(preg_replace('/\D/', '', (string) $get('gtin'))) >= 8),
+                        TextInput::make('gtin')
+                            ->label('GTIN')
+                            ->mask('9 999999 999999')
+                            ->dehydrateStateUsing(fn ($state) => preg_replace('/\D/', '', (string) $state))
+                            ->live(debounce: 500),
                     ])
                     ->label('Größen & Preise')
                     ->columns(2)