programs/itgmania: address a todo

hosts/common/programs/itgmania.nix

@@ -24,7 +24,7 @@
 
     sandbox.whitelistAudio = true;
     sandbox.whitelistDri = true;
-    sandbox.whitelistX = true;  #< TODO: is this needed? try QT_QPA_PLATFORM=wayland or SDL_VIDEODRIVER=wayland
+    sandbox.whitelistX = true;  #< XXX(2025-05-01): neither QT_QPA_PLATFORM=wayland nor SDL_VIDEODRIVER=wayland work; X11 is required
     sandbox.extraPaths = [
       # for the pad input (/dev/input/js*)
       "/dev/input"
@@ -37,7 +37,7 @@
 
     persist.byStore.plaintext = [
       ".itgmania/Cache"  #< otherwise gotta index all the songs every launch
-      ".itgmania/Save"
+      ".itgmania/Save"   #< Save/Preferences.ini (esp: GlobalOffsetSeconds)
     ];
 
     # TODO: setup ~/.local/share/itgmania/Themes