Add targeted Gufw compatibility for Sway sessions

- Remove the global xhost call from start-sway-session to keep Wayland startup clean
- Add a dedicated gufw wrapper and desktop override that temporarily grants Xwayland access only for gufw

dotfiles/desktop/.local/share/applications/gufw.desktop

@@ -0,0 +1,13 @@
+[Desktop Entry]
+Version=1.0
+Type=Application
+Name=Firewall Configuration
+Comment=An easy way to configure your firewall
+Keywords=gufw;security;firewall;network;
+Categories=GNOME;GTK;Settings;Security;X-GNOME-Settings-Panel;X-GNOME-SystemSettings;X-Unity-Settings-Panel;X-XFCE-SettingsDialog;X-XFCE-SystemSettings;
+Exec=/home/fscotto/.local/bin/run-gufw
+Icon=gufw
+Terminal=false
+X-GNOME-Settings-Panel=gufw
+X-Unity-Settings-Panel=gufw
+X-Ubuntu-Gettext-Domain=gufw