fix: clear tsbuildinfo cache in frontend-build to prevent stale builds

- Add rm -rf node_modules/.tmp before npm run build
- Without this, tsc -b reads stale .tsbuildinfo from Docker volume
  and skips recompiling changed files, causing old JS to be served

docker-compose.yml

@@ -98,6 +98,7 @@ services:
       sh -c "
         set -eux;
         npm ci;
+        rm -rf node_modules/.tmp;
         npm run build;
         mkdir -p /build;
         rm -rf /build/*;