Migrate the stale MD2 design of dialog into MD3

The visual experience became better with the new UI based on Mateial You. However, the style of the dialogs did not change, caused a not-so-harmonious look and feel which is down to a mix of MD2’s classic grey background and the new background of MD3 (generated from the theme), together with the different radius sizes of the dialogs and cards. Hope it could be considered. Thanks.

Hello, many thanks putting this to our TODO