The Material AppBar goes away: tabs sit at the left of the 40px strip and
search, sort, and New sit at its right, so the library has one row of chrome
instead of a title bar plus a filter row. Shared and Community hold their
places dimmed until they have somewhere to go. Inside a folder the path moves
out of the title and onto its own card in the content area.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>