Retitle the toggle "Fullscreen" (from "Start in fullscreen") and reword
the description to "Run fee[dB]ack in fullscreen mode. On macOS, changes
take effect on the next launch."
The macOS note is honest about a native-fullscreen limitation: AppKit
drops the first programmatic fullscreen-enter on a window created
windowed, so on macOS the desktop side applies the pref at next launch
rather than live. Windows/Linux apply it live on the first toggle. The
note is self-scoping text (no platform-detection code needed).
Signed-off-by: gionnibgud <gionnibgud@gmail.com>