- build-standalone-fixed.cjs: removed renderHeatmap() replacement block
- The replacement used string concatenation with '\'' which broke
single quotes in generated HTML, causing SyntaxError: unexpected token
- Original renderHeatmap() in index.html uses template literals (`...`)
which are safe and already contain showCellDetail onclick handler
- Rebuilt index.standalone.html from fixed source
- Zero console errors, zero JS syntax errors verified on port 3003
c212a0a34e