- Enable Tailscale plugin in home modules for Garand-Desktop and
Garand-Laptop; keep it disabled in the default host.
- Introduce `tailscale.enable` option in noctalia plugins and add
it to the noctalia-shell configuration with source URL handling.
- Provide default Tailscale settings (refresh interval, UI options,
Taildrop configuration, login server, etc.).
- Add Tailscale widget to the right side of the bar widget list.
- Bump Helium AppImage to version 0.12.5.1 and update its sha256.