A host that embeds either composite with profile-config.locale was ignored (check:host-locale-contract:
0 Arabic characters with locale "ar", against 2121 / 2249 at ?lang=ar).
- stack-demo mounts its children by tag and already threaded tk and provider; locale now rides the
same way to the research dashboard, and the grid (which reads cfg.locale itself) gets it only when
the host gave one. 0 -> 358: the grid half. The dashboard half waits on its own bundle providing
appI18n.
- plugin-studio seeded its language from localStorage / the browser and handed that to every pane.
The ladder is now host profile-config locale/lang -> ?lang= / ?locale= -> saved choice -> browser;
a host- or URL-given language is not persisted as the reader's. 0 -> 893 (its own chrome); the rest
is the Research Gallery pane it opens on, which does not pass the locale on yet.
- plugin-studio's language switch rebuilt a pane's profile-config by hand without provider, tokenUrl
and treeBase, so switching language turned a maplibre pane back into a mapbox one. Mount and
switch now share one paneConfig().
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