- internal/gui: settings form (name, port, source, quality, fps, audio)
wired to the flinger engine, config save/load, start/stop toggle
- system tray via Fyne's StatusNotifierItem: Show (raises window),
Start/Stop, Quit; left-click shows the settings window
- cmd/teleportfling-gui entry point
Verified on Hyprland: tray icon registers, start/stop streaming works,
window shows and focuses from the tray.
