docs(release-notes): extensions list sections

release-notes/studio/unreleased/editor-board-restyle.md

@@ -157,3 +157,4 @@
 - The remembered-fact and guardian-review cards are lighter, as the Chat-Cards-Light-2 board draws: no frame and no "host" tag, one head line with the verdict or the title, the subject and reason under it, a take-back link on the right, and a left rail only when a review blocked something (red) or allowed real risk (amber) (fae6dcc49).
 - Remote machines are cards as the Remote-Machines board draws: a server icon, the name and address, one status pill, the folder and counts under them, and the one next step (test the connection) on the card; turning a machine on or off moves into its "…" menu, and "Add machine" sits above the list. The board's one-click install, cancel and step-by-step add checks are not drawn: the settings page has no call for them (6e6f785f).
 - The phone-access popover lays the pairing QR code beside its expiry and its copy and refresh actions, as the Remote-Phone board draws; the same-network switch stays and the internet route has no switch because it follows the account sign-in (b4accd11a).
+- The extensions page's installed list drops the frame around each group (plugin packages, external tools, skills) into flat section labels with their counts, and the detail beside it loses its card frame, as the Ext-Installed board draws; the list already sat beside its detail, and the board's merged single list and its "…" row menu are not drawn (49c4b870a).