Drop use of node.js canvas package.

[puzrin]

Node's canvas is very fragile and flaky. It's better to use something more solid to render texts.

For example, harfbuzz OR pango webassembly build (pure FreeType is not enougth for full kerning support and other features).

[yisibl]

You can try https://github.com/Brooooooklyn/canvas, which is more stable.

For the WASM version of harfbuzz, you can look at https://github.com/harfbuzz/harfbuzzjs

[puzrin]

Thank you for info. harbuffjs + freetype wasm builds look the most promissing. No time for rework at current moment.

[puzrin]

Switched to skr canvas, now everything works

[yisibl]

Nice work!