Update lockfile, enable Prism Launcher bump Helium

- Refresh flake.lock with newer revisions and hashes
- Enable Prism Launcher in Garand‑Desktop home modules
- Bump Helium AppImage to version 0.18.3.1
- Comment out noctalia homeModules import in core user config
- Add `checkConfig = true` for Noctalia program settings

modules/core/packages/appimages/helium.nix

@@ -4,8 +4,8 @@
   fetchurl,
 }: let
   pname = "helium";
-  version = "0.18.1.1";
-  hash = "sha256-0eG5k9+/7gbp+Q6KKc1Y6HpHUZewT8BIdQYifDOFacs=";
+  version = "0.18.3.1";
+  hash = "sha256-xDrhTCq3FVWz/kC9Al3wBPcLxHlalhoaOlaXn6G4uYA=";
 
   src = fetchurl {
     url = "https://github.com/imputnet/helium-linux/releases/download/${version}/helium-${version}-x86_64.AppImage";