Kristjan ESPERANTO 2850e14172 Unify linting: replace Stylelint and markdownlint with ESLint (#4148) ...

We were running three separate lint tools (ESLint, Stylelint,
markdownlint-cli2) and a separate Prettier step. This PR consolidates
everything: `@eslint/css` and `@eslint/markdown` bring CSS and Markdown
linting into ESLint, so one tool now covers JS, CSS, and Markdown. The
Prettier step got merged into the lint scripts too, so there's now just
`test:lint` to check things and `lint:fix` to fix them.

Outcome: fewer tools to maintain, simpler/fewer scripts, fewer config
files.

As a side effect, the dependabot alerts
https://github.com/MagicMirrorOrg/MagicMirror/security/dependabot/140
and
https://github.com/MagicMirrorOrg/MagicMirror/security/dependabot/141
are resolved, as we no longer use the vulnerable `fast-uri` package
(which was a dependency of `stylelint`).

2026-05-09 12:01:18 +02:00

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