T09a overlays: popover, hover card, dialog with fullscreen, alert, confirm and prompt dialogs; shared severity; tooltip, sheet and drawer point to their homes

tasks/ch01-10.md

@@ -326,18 +326,21 @@
 - [x] SearchableMenu → `menus::SearchableMenu`
 - [x] PieMenu / RadialMenu → `menus::PieMenu`, `menus::PieItem`
 
-## T09 Overlays — `src/overlays`
+## T09a Overlays · Popovers & dialogs — `src/overlays`
+
+- [x] Tooltip → `primitives::Tooltip`
+- [x] Popover → `overlays::Popover`
+- [x] HoverCard → `overlays::HoverCard`
+- [x] Dialog / Modal → `overlays::Dialog`
+- [x] AlertDialog → `overlays::AlertDialog`
+- [x] ConfirmDialog → `overlays::ConfirmDialog`
+- [x] PromptDialog → `overlays::PromptDialog`
+- [x] FullscreenDialog → `overlays::Dialog::fullscreen`
+- [x] Sheet → `layout::Sheet`
+- [x] Drawer → `layout::Drawer`
+
+## T09b Overlays · Guides & floats
 
-- [ ] Tooltip → `primitives::Tooltip`
-- [ ] Popover
-- [ ] HoverCard
-- [ ] Dialog / Modal
-- [ ] AlertDialog
-- [ ] ConfirmDialog
-- [ ] PromptDialog
-- [ ] FullscreenDialog
-- [ ] Sheet → `layout::Sheet`
-- [ ] Drawer → `layout::Drawer`
 - [ ] Lightbox
 - [ ] Spotlight / Coachmark — also T07c Tour / Onboarding and T37 WelcomeTour
 - [ ] FloatingToolbar