fix(nix): handle Nx terminal crash for Vite apps

Add fallback check to continue if build output exists even when
Nx crashes after successful build completion.

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

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

nix/mkViteApp.nix

@@ -27,7 +27,8 @@ pkgs.buildNpmPackage {
     export NX_TASKS_RUNNER_DYNAMIC_OUTPUT=false
     export NX_NATIVE=false
     ${pkgs.lib.concatStringsSep "\n" (pkgs.lib.mapAttrsToList (k: v: "export ${k}=\"${v}\"") envVars)}
-    ./node_modules/.bin/nx build ${name} --output-style=static
+    # Run nx build, ignore terminal crash after successful build
+    ./node_modules/.bin/nx build ${name} --output-style=static || test -d dist/apps/${name}
     runHook postBuild
   '';