v1.2.2

- Subcategories can now be reordered within their category — up/down arrow
  buttons next to "Edytuj" in Admin > Kategorie. The order set there is used
  everywhere a subcategory list is shown (pickers, admin listings, etc.).

src/app/Livewire/Admin/Panel.php

@@ -316,10 +316,55 @@ class Panel extends Component
             return;
         }
 
-        Category::query()->find($categoryId)?->subcategories()->create(['name' => $name]);
+        $category = Category::query()->find($categoryId);
+
+        if (! $category) {
+            return;
+        }
+
+        $nextPosition = ((int) $category->subcategories()->max('sort_order')) + 1;
+        $category->subcategories()->create(['name' => $name, 'sort_order' => $nextPosition]);
         $this->newSubNames[$categoryId] = '';
     }
 
+    public function moveSubcategoryUp(int $subcategoryId): void
+    {
+        $this->swapSubcategoryOrder($subcategoryId, -1);
+    }
+
+    public function moveSubcategoryDown(int $subcategoryId): void
+    {
+        $this->swapSubcategoryOrder($subcategoryId, 1);
+    }
+
+    protected function swapSubcategoryOrder(int $subcategoryId, int $direction): void
+    {
+        $sub = Subcategory::query()->find($subcategoryId);
+
+        if (! $sub) {
+            return;
+        }
+
+        $siblings = Subcategory::query()
+            ->where('category_id', $sub->category_id)
+            ->orderBy('sort_order')
+            ->orderBy('id')
+            ->get();
+
+        $idx = $siblings->search(fn (Subcategory $s) => $s->id === $sub->id);
+        $swapIdx = $idx + $direction;
+
+        if ($idx === false || $swapIdx < 0 || $swapIdx >= $siblings->count()) {
+            return;
+        }
+
+        $other = $siblings[$swapIdx];
+        [$order, $otherOrder] = [$sub->sort_order, $other->sort_order];
+
+        $sub->update(['sort_order' => $otherOrder]);
+        $other->update(['sort_order' => $order]);
+    }
+
     public function openSubcategoryEditForm(int $subcategoryId): void
     {
         $sub = Subcategory::query()->with('customFields')->findOrFail($subcategoryId);