fix: use gdm and uwsm, move monitor config to host-specific

nix/hosts/kumatani/configuration.nix

@@ -45,6 +45,32 @@
   };
 
   desktop.enable = true;
+  home-manager.users.luca = {
+    services.kanshi = {
+      enable = true;
+      settings = [
+        {
+          profile.name = "main";
+          profile.outputs = [
+            {
+              criteria = "DP-1";
+              status = "enable";
+              scale = 1.0;
+              mode = "1920x1080";
+              position = "0,190";
+            }
+            {
+              criteria = "HDMI-A-1";
+              status = "enable";
+              scale = 1.0;
+              mode = "3440x1440";
+              position = "1920,0";
+            }
+          ];
+        }
+      ];
+    };
+  };
   kanata.enable = true;
   kanata.apple = true;
   users.users.luca = {