feat: add quick-create functionality for client categories in the schedule form

app/Http/Controllers/BrandContractController.php

@@ -88,21 +88,17 @@ class BrandContractController extends Controller
     {
         $categoryId = $request->integer('category_id');
         $clientId   = $request->integer('client_id');
+        $dateStr    = $request->input('date');
 
-        if (! $categoryId) {
+        if (! $categoryId || empty($dateStr)) {
             return response()->json(null);
         }
 
-        // Collect the category and its parent chain (so blocking a parent also blocks children)
-        $category   = ClientCategory::find($categoryId);
-        $checkIds   = [$categoryId];
-        if ($category?->parent_id) {
-            $checkIds[] = $category->parent_id;
-        }
+        $date = $dateStr ? \Carbon\Carbon::parse($dateStr) : today();
 
         $contract = BrandContract::with(['client', 'category'])
-            ->active()
-            ->whereIn('category_id', $checkIds)
+            ->active($date)
+            ->where('category_id', $categoryId)
             ->first();
 
         if (! $contract) {