backport cinnamon-desktop changes, nightlight#402

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mtwebster wants to merge 14 commits intomasterfrom

nightlight-xrandr-backports

Commits on Nov 11, 2024

csd-power: Refactoring display backlight code.
mtwebster
committed

Commits on Nov 12, 2024

Change schedule setting to an enum - auto or manual.
mtwebster
committed