CMS article insert/update (chiangmai, where-else): store sub_category_ids as strict CSV ('15,21' not '15, 21') so FIND_IN_SET matches every chosen sub-category, not just the first; migration strips spaces from existing rows

think-backend.greaterchiangmai.com/app/Http/Controllers/Backend/ArticleWhereElseController.php

@@ -118,7 +118,7 @@ class ArticleWhereElseController extends Controller
         // prepared data
         $data = [
             'category_id' => 2,
-            'sub_category_ids' => implode(", ", $sub_categories),
+            'sub_category_ids' => implode(",", $sub_categories),
             'due_date' => $formattedDate,
             'name' => $name,
             'name_en' => $name_en,
@@ -206,7 +206,7 @@ class ArticleWhereElseController extends Controller
         $formattedDate = $dateObject->format('Y-m-d'); // Convert to YYYY-MM-DD
         $data = [
             'category_id' => 2,
-            'sub_category_ids' => implode(", ", $sub_categories),
+            'sub_category_ids' => implode(",", $sub_categories),
             'due_date' => $formattedDate,
             'active' => $active,
             'name' => $name,