Carry reviewed #816 onto current main without conflicts; preserve i18n updates, replace obsolete changelog edit with a fragment, and add a constructor-wiring regression alongside the owner and rail tests.
Credit: raysung-2026 (report), asturksever (review), quanticsoul4772 (Windows diagnosis).
Preserve upstream changes, restore the reviewed Radio ownership regression,
and retain reporter raysung-2026 credit and #804 provenance.
Reconciles upstream main 81cf437 and PR #816 head 702ecc3; no force push.
Retain upstream changes to the panel controller, formatting scope, changelog and docs. Preserve the #804 ownership fix and its rail restoration regression (original report: @raysung-2026).
Close the overlay when adaptive layout restores an auto-collapsed Context directly. Regression covers the reachable rail reflow path; changelog credits the original report by raysung-2026 (#804).
Kevin Rajan