entity_reference_deck 1.0.0-beta4

* `entity_reference_deck_eb` no longer hard-depends on
`entity_browser_multi`. Stock Entity Browser is enough to enable the EB
host; multi-launcher remains a soft-dep (same `entity_reference_deck`
FieldWidgetDisplay when both are enabled).
* CI: rename `preview dist stale` → `dist stale` (`pnpm run check:dist` /
`scripts/check-dist-stale.mjs`). The job rebuilds the full package
(`pnpm run build`) and fails if any committed artifact differs — core /
component / soft-dep CSS, preview Lit + document JS, admin toolbar CSS,
and Style Dictionary token outputs — not only preview `frontend/dist/*.js`.
After SCSS or preview TypeScript changes, run `pnpm run build` (or
`lando pnpm run build`) and commit regenerated artifacts.