Define imv keys, switch to btop, put stateful data in per-system config

modules/home/wms/niri/hotkeys/default.nix

@@ -143,10 +143,15 @@
       ${primeMod}+f { maximize-column; }
       ${primeMod}+Shift+f { fullscreen-window; }
     
-      // Niri specific
+      // Column functions
       ${primeMod}+r { switch-preset-column-width; }
       ${primeMod}+Shift+r { reset-window-height; }
       ${primeMod}+Shift+c { center-column; }
+
+      // Move these into scratchpads if or when they get supported
+      ${primeMod}+Shift+Backslash { spawn "sh" "-c" "foot btop"; }
+      ${primeMod}+Shift+m { spawn "sh" "-c" "foot ncmpcpp"; }
+      ${primeMod}+Shift+v { spawn "sh" "-c" "foot pulsemixer"; }
     }
   '';
 }