T10a feedback: toasts with undo and a hover-held clock, notifications and their center, alert, banner, callout, inline and status messages, empty state; root focus scopes take lost focus

tasks/ch01-10.md

@@ -349,25 +349,28 @@
 - [x] InlinePopup → `overlays::Popover` with the Link variant
 - [x] ToastViewport → lands with Feedback (T10): it holds Toasts
 
-## T10 Feedback — `src/feedback`
+## T10a Feedback · Messages — `src/feedback`
+
+- [x] Toast — success, error, warning, info, action, undo; also T09b ToastViewport → `feedback::Toast`, `feedback::Toaster`, `feedback::ToastViewport`
+- [x] Notification → `feedback::Notification`
+- [x] NotificationCenter → `feedback::NotificationCenter`; also T10b EmptyState, which it shows when empty
+- [x] Alert → `feedback::Alert`
+- [x] Banner → `feedback::Banner`
+- [x] Callout / Admonition → `feedback::Callout`
+- [x] InlineMessage → `feedback::InlineMessage`
+- [x] StatusMessage → `feedback::StatusMessage`
+- [x] Snackbar → `feedback::Toast`
+- [x] UndoToast → `feedback::Toast`
+
+## T10b Feedback · States
 
-- [ ] Toast — success, error, warning, info, action, undo; also T09b ToastViewport
-- [ ] Notification
-- [ ] NotificationCenter
-- [ ] Alert
-- [ ] Banner
-- [ ] Callout / Admonition
-- [ ] InlineMessage
-- [ ] StatusMessage
-- [ ] Snackbar → `feedback::Toast`
-- [ ] UndoToast → `feedback::Toast`
 - [ ] ErrorView
 - [ ] ErrorBoundary — renders and logs a `Result` error; never catches panics
 - [ ] NotFound / 404 → `feedback::ErrorView`
 - [ ] NoPermission / 403 → `feedback::ErrorView`
 - [ ] Maintenance → `feedback::ErrorView`
 - [ ] Offline → `feedback::ErrorView`
-- [ ] EmptyState
+- [x] EmptyState → `feedback::EmptyState`, built with T10a
 - [ ] Result
 - [ ] ConfirmationCard
 - [ ] SavingIndicator