Switch to deploying 2ship2harkinian config file and fix launching it from KDE plasma's start menu.

nix/steam_deck/configuration/roles/2ship2harkinian/default.nix

@@ -1,3 +1,4 @@
+# MANUAL: mkdir -p ~/.persist/.local/share/2ship/saves
 {
   config,
   lib,
@@ -24,19 +25,46 @@
       }
       (lib.mkIf config.me.graphical {
         home.packages = with pkgs; [
-          (config.lib.nixGL.wrap _2ship2harkinian)
+          _2ship2harkinian
         ];
 
-        # TODO perhaps install ~/.local/share/2ship/2ship2harkinian.json
+        home.file.".local/share/2ship/2ship2harkinian.json" = {
+          source = ./files/2ship2harkinian.json;
+        };
 
         home.persistence."/home/deck/.persist" = {
           directories = [
             {
-              directory = ".local/share/2ship";
+              directory = ".local/share/2ship/saves";
               method = "symlink";
             }
           ];
         };
+        home.persistence."/home/deck/.state" = {
+          files = [
+            ".local/share/2ship/mm.o2r"
+          ];
+        };
+
+        nixpkgs.overlays = [
+          (final: prev: {
+            _2ship2harkinian = pkgs.buildEnv {
+              name = prev._2ship2harkinian.name;
+              paths = [
+                (config.lib.nixGL.wrap prev._2ship2harkinian)
+              ];
+              extraOutputsToInstall = [
+                "man"
+                "doc"
+                "info"
+              ];
+              # We have to use 555 instead of the normal 444 here because the .desktop file ends up inside $HOME on steam deck and desktop files must be either not in $HOME or must be executable, otherwise KDE Plasma refuses to execute them.
+              postBuild = ''
+                chmod 0555 $out/share/applications/2s2h.desktop
+              '';
+            };
+          })
+        ];
       })
     ]
   );

nix/steam_deck/configuration/roles/2ship2harkinian/files/2ship2harkinian.json

@@ -0,0 +1,15 @@
+{
+  "CVars": {
+    "gInterpolationFPS": 60,
+    "gSettings": {
+      "InternalResolution": 2.0,
+      "MSAAValue": 2,
+      "OpenMenuBar": 0
+    }
+  },
+  "Window": {
+    "Fullscreen": {
+      "Enabled": true
+    }
+  }
+}