Router updates now run in a React transition, so a route whose code is still loading keeps the current page up
and the view transition captures the new page with its sidebar (it used to drop out and pop back on the first
course-to-lesson visit). The root group's 250 ms UA morph is off: pointer input goes to the document while a
transition runs, so it stays as short as the old page's 120 ms fade. The pointer-events rule had no effect.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Also turns off the fold height transition, which the universal selector does not reach (::details-content).
Co-Authored-By: Claude Opus 5.5 <[email protected]>
