Add KMines package, enable on desktop and laptop

Add kmines to packages.nix and configure its enable flag per host.

hosts/Garand-Desktop/system-modules.nix

@@ -64,6 +64,7 @@ _: {
     spaceCadetPinball.enable = true; # SpaceCadet Pinball: classic pinball game
     ttySolitaire.enable = true; # TTY Solitaire: terminal‑based solitaire game
     heroic.enable = false; # Native GOG, Epic, and Amazon Games Launcher for Linux, Windows and Mac
+    kmines.enable = true; # KMines: KMines is the classic Minesweeper game
 
     /*
     Development Tools

hosts/Garand-Laptop/system-modules.nix

@@ -64,6 +64,7 @@ _: {
     spaceCadetPinball.enable = true; # SpaceCadet Pinball: classic pinball game
     ttySolitaire.enable = true; # TTY Solitaire: terminal‑based solitaire game
     heroic.enable = false; # Native GOG, Epic, and Amazon Games Launcher for Linux, Windows and Mac
+    kmines.enable = true; # KMines: KMines is the classic Minesweeper game
 
     /*
     Development Tools

hosts/default/system-modules.nix

@@ -64,6 +64,7 @@ _: {
     spaceCadetPinball.enable = false; # SpaceCadet Pinball: classic pinball game
     ttySolitaire.enable = false; # TTY Solitaire: terminal‑based solitaire game
     heroic.enable = false; # Native GOG, Epic, and Amazon Games Launcher for Linux, Windows and Mac
+    kmines.enable = false; # KMines: KMines is the classic Minesweeper game
 
     /*
     Development Tools

modules/core/packages/appimages/helium.nix

@@ -37,3 +37,4 @@ in
     };
   }
 # https://github.com/imputnet/helium-linux/releases/download/0.11.7.1/helium-0.11.7.1-x86_64.AppImage
+

modules/core/packages/packages.nix

@@ -75,6 +75,7 @@
     logisim-evolution = logisim-evolution;
     notify = notify-client;
     boxes = gnome-boxes;
+    kmines = kdePackages.kmines;
     switcheroo = switcheroo;
     simpleScan = simple-scan.overrideAttrs (old: {
       postFixup =