fix: PHP Fatal Error and attribute input UX

Critical Fixes:

1. ✅ PHP Fatal Error - FIXED
   Problem: call_user_func() error - Permissions::check_admin does not exist
   Cause: Method name mismatch in ProductsController.php
   Solution: Changed all 8 occurrences from:
     'permission_callback' => [Permissions::class, 'check_admin']
   To:
     'permission_callback' => [Permissions::class, 'check_admin_permission']

   Affected routes:
   - GET /products
   - GET /products/:id
   - POST /products
   - PUT /products/:id
   - DELETE /products/:id
   - GET /products/categories
   - GET /products/tags
   - GET /products/attributes

2. ✅ Attribute Options Input - FIXED
   Problem: Cannot type anything after first word (cursor jumps)
   Cause: Controlled input with immediate state update on onChange
   Solution: Changed to uncontrolled input with onBlur

   Changes:
   - value → defaultValue (uncontrolled)
   - onChange → onBlur (update on blur)
   - Added key prop for proper re-rendering
   - Added onKeyDown for Enter key support
   - Updated help text: "press Enter or click away"

   Now you can:
   ✅ Type: Red, Blue, Green (naturally!)
   ✅ Type: Red | Blue | Green (pipe works too!)
   ✅ Press Enter to save
   ✅ Click away to save
   ✅ No cursor jumping!

Result:
- Products index page loads without PHP error
- Attribute options input works naturally
- Both comma and pipe separators supported

includes/Api/ProductsController.php

@@ -28,56 +28,56 @@ class ProductsController {
 		register_rest_route('woonoow/v1', '/products', [
 			'methods' => 'GET',
 			'callback' => [__CLASS__, 'get_products'],
-			'permission_callback' => [Permissions::class, 'check_admin'],
+			'permission_callback' => [Permissions::class, 'check_admin_permission'],
 		]);
 		
 		// Get single product
 		register_rest_route('woonoow/v1', '/products/(?P<id>\d+)', [
 			'methods' => 'GET',
 			'callback' => [__CLASS__, 'get_product'],
-			'permission_callback' => [Permissions::class, 'check_admin'],
+			'permission_callback' => [Permissions::class, 'check_admin_permission'],
 		]);
 		
 		// Create product
 		register_rest_route('woonoow/v1', '/products', [
 			'methods' => 'POST',
 			'callback' => [__CLASS__, 'create_product'],
-			'permission_callback' => [Permissions::class, 'check_admin'],
+			'permission_callback' => [Permissions::class, 'check_admin_permission'],
 		]);
 		
 		// Update product
 		register_rest_route('woonoow/v1', '/products/(?P<id>\d+)', [
 			'methods' => 'PUT',
 			'callback' => [__CLASS__, 'update_product'],
-			'permission_callback' => [Permissions::class, 'check_admin'],
+			'permission_callback' => [Permissions::class, 'check_admin_permission'],
 		]);
 		
 		// Delete product
 		register_rest_route('woonoow/v1', '/products/(?P<id>\d+)', [
 			'methods' => 'DELETE',
 			'callback' => [__CLASS__, 'delete_product'],
-			'permission_callback' => [Permissions::class, 'check_admin'],
+			'permission_callback' => [Permissions::class, 'check_admin_permission'],
 		]);
 		
 		// Get product categories
 		register_rest_route('woonoow/v1', '/products/categories', [
 			'methods' => 'GET',
 			'callback' => [__CLASS__, 'get_categories'],
-			'permission_callback' => [Permissions::class, 'check_admin'],
+			'permission_callback' => [Permissions::class, 'check_admin_permission'],
 		]);
 		
 		// Get product tags
 		register_rest_route('woonoow/v1', '/products/tags', [
 			'methods' => 'GET',
 			'callback' => [__CLASS__, 'get_tags'],
-			'permission_callback' => [Permissions::class, 'check_admin'],
+			'permission_callback' => [Permissions::class, 'check_admin_permission'],
 		]);
 		
 		// Get product attributes
 		register_rest_route('woonoow/v1', '/products/attributes', [
 			'methods' => 'GET',
 			'callback' => [__CLASS__, 'get_attributes'],
-			'permission_callback' => [Permissions::class, 'check_admin'],
+			'permission_callback' => [Permissions::class, 'check_admin_permission'],
 		]);
 	}