[6.x] Fix duplicate items in the Command Palette's "Recent" category (#13471)

Co-authored-by: Jason Varga <jason@pixelfear.com>

Author: duncanmcclean

resources/js/components/command-palette/CommandPalette.vue

@@ -224,10 +224,10 @@ function getRecentItems() {
 }
 
 function addToRecentItems(item) {
-    item.category = __('Recent');
+    const recentItem = { ...item, category: __('Recent') };
 
     const filtered = getRecentItems().filter(recentItem => recentItem.text !== item.text);
-    const updated = [item, ...filtered].slice(0, 5);
+    const updated = [recentItem, ...filtered].slice(0, 5);
 
     localStorage.setItem('statamic.command-palette.recent', JSON.stringify(updated));