Onboarding · Flows and highlights: focus that holds as the flow turns, a tip that closes

navigation::Wizard keeps one focus handle for Next and Finish, so a
second press on the step before last finishes; Back that reaches the
first step, and a finished step picked by key, hand focus to Next.
Popover::with_opener hands its content a close that gives focus back:
Got it closes the hotspot's tip before the owner hides it, and the
event details close before Edit and Delete run, so focus never lands
on a panel that left the tree. The wizard's count and the setup
checklist's tally name their selectors after their words, and the bar
takes the count's own value.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/overlays/tests/mod.rs

@@ -430,5 +430,5 @@ fn a_tall_dialog_body_keeps_its_height_and_scrolls(cx: &mut TestAppContext) {
 #[test]
 #[should_panic(expected = "an icon is for its own button")]
 fn a_popover_opened_by_its_owner_takes_no_icon() {
-    let _ = Popover::with_opener("own", |_| div(), |_, _| div()).icon(IconName::Clock);
+    let _ = Popover::with_opener("own", |_| div(), |_, _, _| div()).icon(IconName::Clock);
 }