Live site had drifted from the repo: it serves prebuilt minified bundles
(app/components/tweaks-panel.min.js), vendored React, robots.txt and
sitemap.xml, with root-relative asset paths and an apex canonical.
- index.html: replaced with the live served copy
- app.jsx: App root extracted from the old inline text/babel block
- build.sh: esbuild step producing the *.min.js bundles
- vendor/: React 18.3 production UMDs pulled from live
- robots.txt, sitemap.xml: pulled from live
- Dockerfile: ship built bundles + vendor, drop raw jsx/standalone
