Toogle dark mode (m) does not work
Docs on Textual themes: https://textual.textualize.io/guide/design/#__tabbed_1_5
Somewhere around here to fix/implement in DiscoDOS:
https://github.com/JOJ0/discodos/blob/06b8c25fb90908d8659e27631da723aadf278e00/discodos/ctrl/tui.py#L29-L71
The Textual docs link posted above suggests to hook into the on_mount method of the Textual application, for discodos this would be here: https://github.com/JOJ0/discodos/blob/06b8c25fb90908d8659e27631da723aadf278e00/discodos/ctrl/tui.py#L276-L279
As a first step of implementing proper theme configuratbility in discodos, I would try if simply hardcoding one of the built-in themes works as suggested in there docs here: https://textual.textualize.io/guide/design/#changing-the-theme