Fix 500 on recipe save and surface errors as notifications

- Fix root cause: recipes_spices.amount_in_percent was decimal(4,2) which
  overflows on 100% — widened to decimal(6,2) via migration
- Wrap afterSave() in try-catch so DB/logic errors show as a persistent
  danger notification instead of a blank 500 page
- Same for CreateProduct: errors show as notification; also reads
  recipe_spices from raw Livewire $this->data (not $data param which
  excludes dehydrated(false) fields) so recipes actually save on create

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

app/Filament/User/Resources/ProductResource/Pages/CreateProduct.php

@@ -5,6 +5,7 @@ namespace App\Filament\User\Resources\ProductResource\Pages;
 use App\Filament\User\Resources\ProductResource;
 use App\Models\ProductSize;
 use App\Models\Recipe;
+use Filament\Notifications\Notification;
 use Filament\Resources\Pages\CreateRecord;
 use Illuminate\Database\Eloquent\Model;
 
@@ -14,36 +15,50 @@ class CreateProduct extends CreateRecord
 
     protected function handleRecordCreation(array $data): Model
     {
+        $sizes  = $data['sizes'] ?? [];
+        $spices = $this->data['recipe_spices'] ?? [];
+        unset($data['sizes']);
+
+        try {
             $record = static::getModel()::create($data);
 
-        foreach ($data['sizes'] ?? [] as $size) {
+            foreach ($sizes as $size) {
+                if (empty($size['packing_id'])) {
+                    continue;
+                }
+                $gtin = preg_replace('/\D/', '', (string) ($size['gtin'] ?? ''));
                 ProductSize::create([
                     'product_id'  => $record->id,
-                'packing_id'  => $size['packing_id'],
+                    'packing_id'  => (int) $size['packing_id'],
                     'description' => $size['description'] ?? null,
                     'price'       => $size['price'],
-                'sku'         => $size['sku'] ?? null,
-                'gtin'        => $size['gtin'] ?? null,
+                    'sku'         => $size['sku'] ?: null,
+                    'gtin'        => $gtin !== '' ? $gtin : null,
                 ]);
             }
 
-        $spices = $data['recipe_spices'] ?? [];
-
             if (! empty($spices)) {
                 $recipe = Recipe::create([
                     'name'       => $data['title'],
                     'product_id' => $record->id,
                     'version'    => 1,
                 ]);
-
                 $pivotData = collect($spices)->mapWithKeys(fn ($s) => [
-                $s['spice_id'] => ['amount_in_percent' => $s['amount_in_percent']],
+                    (int) $s['spice_id'] => ['amount_in_percent' => (float) $s['amount_in_percent']],
                 ])->toArray();
-
                 $recipe->spices()->sync($pivotData);
                 $record->update(['recipes_id' => $recipe->id]);
             }
 
             return $record;
+        } catch (\Throwable $e) {
+            Notification::make()
+                ->title('Fehler beim Anlegen')
+                ->body($e->getMessage())
+                ->danger()
+                ->persistent()
+                ->send();
+            throw $e;
+        }
     }
 }

app/Filament/User/Resources/ProductResource/Pages/EditProduct.php

@@ -51,8 +51,17 @@ class EditProduct extends EditRecord
 
     protected function afterSave(): void
     {
+        try {
             $this->syncSizes();
             $this->syncRecipe();
+        } catch (\Throwable $e) {
+            Notification::make()
+                ->title('Fehler beim Speichern')
+                ->body($e->getMessage())
+                ->danger()
+                ->persistent()
+                ->send();
+        }
     }
 
     protected function syncSizes(): void

database/migrations/2026_09_12_200000_fix_amount_in_percent_precision.php

@@ -0,0 +1,22 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('recipes_spices', function (Blueprint $table) {
+            $table->decimal('amount_in_percent', 6, 2)->change();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('recipes_spices', function (Blueprint $table) {
+            $table->decimal('amount_in_percent', 4, 2)->change();
+        });
+    }
+};