It sat across the top of the detail panel with Sync, Build and Publish — three
things that act on the site, beside one that decides how you are looking at it.
The toggle belongs with the settings it scopes: a spacing is chosen per width,
so the control saying which width is the first thing in that column.
Sync, Build and Publish are unmounted until they have a place of their own.
ViewModeProvider stays; it was never the bar's.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>