ui: change dark mode background configs (#2720) #500

Job	Run time
Frontend and End-to-End Tests / build	3m 45s
Frontend and End-to-End Tests / lint	4m 25s
Backend Server Tests / tests (sqlite)	4m 42s
Backend Server Tests / tests (postgres)	5m 50s
Build Tagged Release / publish	1h 36m 57s
Notify Discord	8s
	1h 55m 47s

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