I tried searching for this & could not find anything so I apologize if it already exists.
Currently Obsidian will allow you to delete something that you have starred.
This leads to some small confusion & extra work when you go to your starred item pane, as now you have starred items that no longer exist.
Obsidian handles it gracefully enough, telling you “can not find file xxx” but, I think it would make for a much smoother workflow if when you go to delete something that you have starred, Obsidian would warn you with something to the effect of “This item is currently starred. Are you sure you want to delete it? By Deleting it you will also be removing this item from your list starred items.”
As the dialog says, if you confirm that you’re sure, then Obsidian would also remove the starred entry from the star pane.