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/home/noctalia/default.nix

@@ -6,6 +6,7 @@
   programs.noctalia = {
     enable = true;
     package = inputs.noctalia.packages.${system}.default;
+    checkConfig = true;
   };
 
   imports = [