Remember display theme preferences even after cookie clearing

For those of us have our browsers set to clear all cookies upon exit find it annoying to login in the middle of the night only to get our eyes blasted with the white theme. Settings need to dug around with to switch is to something darker every time. This could be avoided by having the server remember the theme preferences of the users.

If this is something that's already discussed previously or planned to be worked on internally, please correct me below. Thank you