update context image should be text

controllers/contextController.js

@@ -228,10 +228,10 @@ class ContextController {
       const { id } = req.params;
       const { image } = req.body;
 
-      if (!image || !Array.isArray(image) || image.length === 0) {
+      if (!image || typeof image !== 'string' || image.trim().length === 0) {
         return res.status(400).json({
           success: false,
-          message: 'Image must be a non-empty array of URLs'
+          message: 'Image must be a non-empty string (URL)'
         });
       }