fix(nix): allow network access for Google Fonts during build

Add __noChroot=true to enable network access for next/font/google
to fetch Poppins and Bai_Jamjuree fonts during the Next.js build.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

nix/landing.nix

@@ -9,6 +9,9 @@ pkgs.buildNpmPackage {
   npmFlags = [ "--legacy-peer-deps" ];
   makeCacheWritable = true;
 
+  # Allow network access for Google Fonts fetching during Next.js build
+  __noChroot = true;
+
   nativeBuildInputs = with pkgs; [
     nodejs_22
     nodePackages.npm