Sync Reddit night mode to OS theme; persists via GraphQL; updates all tabs + new tabs without reload.
My ChatGPT5.2 AI Slop version of a Reddit Dark mode/theme switcher to keep it in sync with my system's light/dark mode. None of the others worked well enough for me, and this one seems to handle everything.
Only tested in Edge on W11, but it changes Reddit's theme to match system immediately and handles foreground and background tabs without reload.
