fix(generic-popover): add missing default value for a prop

Author: habibayman

app/components/ui/popover/PopoverContent.vue

@@ -14,6 +14,7 @@ const props = withDefaults(
   {
     align: 'center',
     sideOffset: 4,
+    class: undefined,
   },
 );
 const emits = defineEmits<PopoverContentEmits>();