fix(nix): use --output-style=static to bypass Nx terminal crash

Call Nx directly with --output-style=static flag instead of through
npm scripts to completely bypass the pseudo terminal initialization
that crashes in non-TTY environments.

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

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

nix/landing.nix

@@ -25,7 +25,7 @@ pkgs.buildNpmPackage {
     export NX_SKIP_NX_CACHE=true
     export NX_TASKS_RUNNER_DYNAMIC_OUTPUT=false
     export NX_NATIVE=false
-    npm run landing:build
+    ./node_modules/.bin/nx build landing --output-style=static
     runHook postBuild
   '';