Add piece_weight calibration: enter Stück + Gramm per delivery, average auto-calculated

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

app/Filament/User/Resources/SpiceResource.php

@@ -7,6 +7,7 @@ use App\Filament\User\Resources\SpiceResource\RelationManagers;
 use App\Models\Spice;
 use Filament\Forms;
 use Filament\Forms\Form;
+use Filament\Forms\Get;
 use Filament\Resources\Resource;
 use Filament\Tables;
 use Filament\Tables\Table;
@@ -35,12 +36,19 @@ class SpiceResource extends Resource
                     ->label('Mengeneinheit')
                     ->native(false)
                     ->searchable()
+                    ->live()
                     ->options([
                         'grams' => '(Kilo-)Gramm',
                         'pieces' => 'Stück',
                         'liter' => 'Liter',
                     ])
                     ->required(),
+                Forms\Components\TextInput::make('piece_weight')
+                    ->label('Ø Stückgewicht (g)')
+                    ->numeric()
+                    ->suffix('g')
+                    ->helperText('Wird automatisch aus Lieferungen errechnet, kann aber auch manuell gesetzt werden.')
+                    ->visible(fn (Get $get) => $get('unit') === 'pieces'),
             ]);
     }