Add recipe versioning: auto-bump on change, history sub-page

Each time the recipe name or spices are changed on the product edit
page, a new version is created instead of overwriting the current one.
Unchanged saves are skipped. A 'Rezept-Versionen' button opens a
sub-page (/produkt/{id}/rezept-versionen) listing all versions with
their spices and timestamps; the active version is highlighted in green.

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

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

@@ -14,16 +14,23 @@ class EditProduct extends EditRecord
     protected function getHeaderActions(): array
     {
         return [
+            Actions\Action::make('rezept-versionen')
+                ->label('Rezept-Versionen')
+                ->icon('heroicon-o-clock')
+                ->color('gray')
+                ->url(fn () => ProductResource::getUrl('recipe-history', ['record' => $this->record])),
             Actions\DeleteAction::make(),
         ];
     }
 
-    protected function afterSave(): void {
+    protected function afterSave(): void
+    {
         $this->syncSizes();
         $this->syncRecipe();
     }
 
-    protected function syncSizes(): void {
+    protected function syncSizes(): void
+    {
         $product = $this->record;
 
         $sizes = collect($this->data['sizes'] ?? [])
@@ -45,29 +52,48 @@ class EditProduct extends EditRecord
     protected function syncRecipe(): void
     {
         $product = $this->record;
-        $name   = $this->data['recipe_name'] ?? null;
-        $spices = $this->data['recipe_spices'] ?? [];
+        $name    = $this->data['recipe_name'] ?? null;
+        $spices  = $this->data['recipe_spices'] ?? [];
 
         if (! $name) {
             return;
         }
 
-        $pivotData = collect($spices)->mapWithKeys(fn ($s) => [
-            $s['spice_id'] => ['amount_in_percent' => $s['amount_in_percent']],
+        $newPivot = collect($spices)->mapWithKeys(fn ($s) => [
+            (int) $s['spice_id'] => (float) $s['amount_in_percent'],
         ])->toArray();
 
-        if ($product->recipe) {
-            $product->recipe->update(['name' => $name]);
-            $product->recipe->spices()->sync($pivotData);
-        } else {
-            $nextVersion = Recipe::where('product_id', $product->id)->max('version') + 1;
-            $recipe = Recipe::create([
-                'name'       => $name,
-                'product_id' => $product->id,
-                'version'    => $nextVersion,
-            ]);
-            $recipe->spices()->sync($pivotData);
-            $product->update(['recipes_id' => $recipe->id]);
+        $current = $product->recipe;
+
+        if ($current) {
+            $current->load('spices');
+
+            $existingPivot = $current->spices->mapWithKeys(fn ($s) => [
+                $s->id => (float) $s->pivot->amount_in_percent,
+            ])->toArray();
+
+            $nameChanged   = $current->name !== $name;
+            $spicesChanged = $existingPivot != $newPivot;
+
+            if (! $nameChanged && ! $spicesChanged) {
+                return;
+            }
         }
+
+        $nextVersion = Recipe::where('product_id', $product->id)->max('version') + 1;
+
+        $recipe = Recipe::create([
+            'name'       => $name,
+            'product_id' => $product->id,
+            'version'    => $nextVersion,
+        ]);
+
+        $recipe->spices()->sync(
+            collect($newPivot)->mapWithKeys(fn ($pct, $id) => [
+                $id => ['amount_in_percent' => $pct],
+            ])->toArray()
+        );
+
+        $product->update(['recipes_id' => $recipe->id]);
     }
 }