Add timeline slider with sunrise/sunset info for automatic dark/light mode scheduling #1847
Description
The automatic dark/light mode switching based on sunrise/sunset currently doesn't display the actual sunrise and sunset times. Showing these times would be very helpful since most users don't know them off the top of their head.
Additionally, many users prefer to keep dark mode a bit longer into the morning or switch earlier in the evening, rather than strictly following the sun. A simple timeline slider would allow users to fine-tune the switch times with an offset, while still using sunrise/sunset as a reference.
Suggestion: Add a visual timeline (similar to KDE Plasma's Night Light settings, which handles this very well) that displays:
- The current sunrise/sunset times for the user's location
- The effective daylight duration
- Draggable handles to adjust the actual switch times