fix(zix790prors): set Sway output to 164.9Hz for AW3423DWF

The monitor refresh rate was only configured via xrandr session commands,
which have no effect on Wayland/Sway sessions, leaving it at 60Hz.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

flake.nix

@@ -183,7 +183,16 @@
       modules = nixosModules ++ [
         ./machines/zix790prors/configuration.nix
         {
-          home-manager.users.johno = import ./home/home-desktop.nix;
+          home-manager.users.johno = {
+            imports = [ ./home/home-desktop.nix ];
+            home.roles.i3_sway.extraSwayConfig = {
+              output = {
+                "DP-1" = {
+                  mode = "3440x1440@164.900Hz";
+                };
+              };
+            };
+          };
           home-manager.extraSpecialArgs = { inherit system; };
         }
       ];