Migrate all JS config and tools to TS and fix a number of type issues.
This required Node.js 22.18.0 or greater where [type-stripping was
enabled](https://nodejs.org/en/blog/release/v22.18.0) by default.
Given that Node 22 is the current LTS, I think it's ok to assume that
the user has a recent version of it.
Webpack currently requires the `--disable-interpret` flag to work,
should be fixed eventually with
https://github.com/webpack/webpack-cli/issues/4525.
`fast-glob` is replaced by `fs.globSync`, available in Node 22.0.0 or
greater.
- Update all updateable dependencies
- Add a few more unupgradable ones to updates blocklist
- Adapt to breaking changes
- Update to typescript 5.8, enable `erasableSyntaxOnly` which
necessitated a change because of forbidden syntax
- Misc cleanups
- Tested htmx, easymde, swagger, chart.js
- Update all JS and PY dependencies
- Tested affected dependencies
- Disabled `async-preventdefault` lint rule because it brought up new
false-positives.
- Add `eslint-plugin-no-use-extend-native` to exclude list because it
requires flat config
- Exclude `@github/text-expander-element` because new version has broken
positioning
- Tested mermaid, monaco, swagger, chartjs