Embed recipe editing directly on product page

Replaces the recipe dropdown with an inline Section containing a name
field and a spice-repeater with percentage inputs. On save, the recipe
is created (version 1) or updated in place; spice pivot rows are synced
via sync(). SumEquals100 rule enforces that percentages add up to 100.

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

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

@@ -3,19 +3,20 @@
 namespace App\Filament\User\Resources\ProductResource\Pages;
 
 use App\Filament\User\Resources\ProductResource;
+use App\Models\ProductSize;
+use App\Models\Recipe;
 use Filament\Resources\Pages\CreateRecord;
 use Illuminate\Database\Eloquent\Model;
-use App\Models\ProductSize;
 
 class CreateProduct extends CreateRecord
 {
     protected static string $resource = ProductResource::class;
 
-    protected function handleRecordCreation(array $data): Model {
-
+    protected function handleRecordCreation(array $data): Model
+    {
         $record = static::getModel()::create($data);
 
-        foreach ($data['sizes'] as $size) {
+        foreach ($data['sizes'] ?? [] as $size) {
             ProductSize::create([
                 'product_id'  => $record->id,
                 'packing_id'  => $size['packing_id'],
@@ -25,6 +26,25 @@ class CreateProduct extends CreateRecord
                 'gtin'        => $size['gtin'] ?? null,
             ]);
         }
+
+        $recipeName = $data['recipe_name'] ?? null;
+        $spices     = $data['recipe_spices'] ?? [];
+
+        if ($recipeName) {
+            $recipe = Recipe::create([
+                'name'       => $recipeName,
+                'product_id' => $record->id,
+                'version'    => 1,
+            ]);
+
+            $pivotData = collect($spices)->mapWithKeys(fn ($s) => [
+                $s['spice_id'] => ['amount_in_percent' => $s['amount_in_percent']],
+            ])->toArray();
+
+            $recipe->spices()->sync($pivotData);
+            $record->update(['recipes_id' => $recipe->id]);
+        }
+
         return $record;
     }
 }