inheritAttrs:false on the studio root, so a host's attributes (style,
class, id) stay on the <plugin-studio> element instead of also landing
on the layout inside it: the trap that made the Prayer Walk Planner
76px tall in the gallery. Layout verified unchanged in four hosts on the
built bundle: its own page (shell 1280x900, body 836), a bare partner
snippet (85vh default), a host that sets its own inline height (the
style stays on the host; the shell root has no style attribute), and
the app-shell mounter from BUG-EMBEDDED-PLUGIN-STUDIO-BLACK-SCREEN,
display:block forced on the host: body 656px, rail and tree rendered.
That bug no longer reproduces on the dx-maps side.
internal/measure-map-load.mjs: per production map, the cold, throttled
waterfall (bundle, engine script, style, data, basemap up, visible
tiles loaded) on a served built tree, from the leaf page or, with
--embed, from a partner page that pastes only the embed snippet. It
showed that Vue is already inlined in every bundle and that the engine
waits on the bundle only on partner pages.
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