fix(nix): disable Nx native terminal to prevent build crash

Add NX_TASKS_RUNNER_DYNAMIC_OUTPUT=false and NX_NATIVE=false
to completely disable Nx's Rust-based terminal handling that
crashes in non-TTY build environments.

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

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

nix/landing.nix

@@ -23,6 +23,8 @@ pkgs.buildNpmPackage {
     export NO_COLOR=1
     export TERM=dumb
     export NX_SKIP_NX_CACHE=true
+    export NX_TASKS_RUNNER_DYNAMIC_OUTPUT=false
+    export NX_NATIVE=false
     npm run landing:build
     runHook postBuild
   '';

nix/mkViteApp.nix

@@ -24,6 +24,8 @@ pkgs.buildNpmPackage {
     export NO_COLOR=1
     export TERM=dumb
     export NX_SKIP_NX_CACHE=true
+    export NX_TASKS_RUNNER_DYNAMIC_OUTPUT=false
+    export NX_NATIVE=false
     ${pkgs.lib.concatStringsSep "\n" (pkgs.lib.mapAttrsToList (k: v: "export ${k}=\"${v}\"") envVars)}
     npm run ${buildScript}
     runHook postBuild