Vite was injecting modulepreload-polyfill.js into the built output, which
Chrome rejected at runtime with: 'A preload for .../modulepreload-polyfill.js
is found, but is not used because it is a cross-world extension resource
mismatch.'
Disabling the polyfill (extension context does not need it — Chrome 110+
supports bare ESM natively) removes the offending chunk entirely.
robot