waybar.service: Use sway-session.target instead of graphical-session.target

[leigh123linux]

graphical-session.target is now activated by multiple desktop environments
including GNOME and Cinnamon. waybar only functions under wlroots-based
Wayland compositors so WantedBy=graphical-session.target causes it to be
started unconditionally in any graphical session.

Use WantedBy=sway-session.target to scope waybar to Sway sessions only.
Users of other wlroots compositors can enable it manually against their
own session target.

[leigh123linux]

@alebastr

[RobertMueller2]

should solve issue #3955

[Alexays]

Thanks! We can't take this as-is: switching WantedBy to sway-session.target makes the unit Sway-specific, but Waybar targets "Sway and Wlroots based compositors" — river/Hyprland/other wlroots setups rely on graphical-session.target, so this would break autostart for them. The [Unit] block also still references graphical-session.target (PartOf/After), making the result inconsistent. If you need a Sway-specific target, that's better done in a Sway-specific drop-in on your side rather than the shipped unit. 🙏

[leigh123linux]

It targets everything including places it isn't welcomed eg: gnome, cinnamon and kde
You need to make this your number one priority.