When /settings (or the Extensions/Agents dashboard) is open and a tool
approval prompt fires, ExtensionUiController.showHookSelector swaps the
editor out of editorContainer for the HookSelectorComponent. On exit,
the overlay's done() called overlayHandle.hide() + setFocus(editor),
both pointing at the editor captured as preFocus when the overlay
opened — now no longer mounted. The visible approval prompt then sat
unreachable: Up/Down/Enter/Esc routed to the unmounted editor and only
Ctrl+C escaped (issue #3349).
SelectorController now exposes focusActiveEditorArea(), which restores
focus to editorContainer.children[0] (the live slot owner) or falls
back to the editor. Wired into showSettingsSelector, showExtensionsDashboard,
and showAgentsDashboard close paths after overlay.hide().
Tests: unit test verifying focusActiveEditorArea picks the live slot
owner; TUI overlay-focus regression pinning the post-fix contract plus
a 'pre-fix snapshot' test pinning the broken pre-fix behavior so the
restore-from-preFocus assumption can't silently change.
Fixes#3349
Gerben Meijer