Fix json serialization (#16558)

* fix copying json fields

* fixed preset filter type

* handling fallback in copyToClipboard function

* add test

* try parsing json content on paste

Co-authored-by: Azri Kahar <42867097+azrikahar@users.noreply.github.com>

app/src/modules/settings/routes/presets/item.vue

@@ -528,7 +528,7 @@ function useForm() {
 		{
 			field: 'filter',
 			name: t('filter'),
-			type: 'string',
+			type: 'json',
 			meta: {
 				interface: 'system-filter',
 				width: 'half',