Parity with the YouTube playlist header (E9 12D): the Plex playlist detail
now carries a meta line under the title — "N items · Xh Ym", summed from the
items' duration_seconds. No backend change: leaf_card already serializes
duration_seconds for both movies and episodes, and no new i18n key either —
the count reuses plex.browse.items, the same key the collection header uses.
The title/rename input moved into a min-w-0 flex-1 column so the meta line
sits under both; the line is hidden on an empty playlist.
peter
1b004e6ccf