refactor(niri,xwayland-satellite): split out xwayland-satellite

해결 #5

modules/nixos/dank-material-shell.nix

@@ -12,6 +12,13 @@ in {
       enableDynamicTheming = false;
     };
 
+    # Start after xwayland-satellite, if possible.  So DMS can start
+    # with the DISPLAY env var set.
+    systemd.user.services.dms = {
+      wants = ["xwayland-satellite.service"];
+      after = ["xwayland-satellite.service"];
+    };
+
     services.displayManager.dms-greeter = {
       enable = true;
       compositor.name = assert config.sydnix.niri.enable; "niri";