One observer per pane element, disconnected on leaving the page, so a
closed and reopened pane rewrites links for its current organization.
Project reads check the pane generation and organization before any
DOM write. Request selection and expanded PRDs are kept per pane.
A late navigation focuses its heading only when focus has not moved to
the other pane. Project pages in a pane use a compact layout with
container queries.
jason.woltje
5f57008aed