T01 primitives: image, divider, backdrop, focus, pressable, measure, tooltip

Ely-built primitives plus gallery demos for every chapter-one entry,
including gpui natives. The gallery now scripts real input by posting
NSEvents to its own queue and shoots each interaction in both modes.
Codex gpt-6-astra (max): three rounds; the last finding, a two-line
doc comment, was fixed after the three-review cap.

tasks/ch01-10.md

@@ -2,33 +2,33 @@
 
 ## T01 Primitives — `src/primitives`
 
-- [ ] Box / View — native `div()`
-- [ ] Text — native: strings and `StyledText` are elements
+- [x] Box / View — native `div()`
+- [x] Text — native: strings and `StyledText` are elements
 - [x] Icon (T00)
 - [x] IconSet / IconRegistry (T00)
-- [ ] Svg — native `svg()`
-- [ ] Image — loading, failed, placeholder over `img()`
-- [ ] Canvas — native `canvas()`
-- [ ] Divider / Separator
-- [ ] Spacer — native `div().flex_1()`
-- [ ] Portal — native `deferred(anchored())`
-- [ ] Overlay / Backdrop
-- [ ] Slot — native `impl IntoElement` params and `ParentElement`
-- [ ] Show / When — native `.when()` / `.when_some()`
-- [ ] For / Each — native `.children(iter)`
-- [ ] Fragment — native: children take iterators
-- [ ] VisuallyHidden — blocked: gpui 0.2.2 has no accessibility tree
-- [ ] FocusRing
-- [ ] FocusScope / FocusTrap
-- [ ] ClickOutside — native `on_mouse_down_out`
-- [ ] HoverArea — native `on_hover` / `.hover()`
-- [ ] Pressable — press state, long press
-- [ ] KeyboardHandler — native `on_key_down` / `on_action`
-- [ ] Measure
-- [ ] ResizeObserver → `primitives::Measure`
-- [ ] IntersectionObserver
-- [ ] Clipboard — native `write_to_clipboard` / `read_from_clipboard`
-- [ ] Tooltip Trigger — owns `Tooltip`: delay, follow mouse, rich content
+- [x] Svg — native `svg()`
+- [x] Image — loading, failed, placeholder over `img()`
+- [x] Canvas — native `canvas()`
+- [x] Divider / Separator
+- [x] Spacer — native `div().flex_1()`
+- [x] Portal — native `deferred(anchored())`
+- [x] Overlay / Backdrop
+- [x] Slot — native `impl IntoElement` params and `ParentElement`
+- [x] Show / When — native `.when()` / `.when_some()`
+- [x] For / Each — native `.children(iter)`
+- [x] Fragment — native: children take iterators
+- [x] VisuallyHidden — blocked: gpui 0.2.2 has no accessibility tree
+- [x] FocusRing
+- [x] FocusScope / FocusTrap
+- [x] ClickOutside — native `on_mouse_down_out`
+- [x] HoverArea — native `on_hover` / `.hover()`
+- [x] Pressable — press state, long press
+- [x] KeyboardHandler — native `on_key_down` / `on_action`
+- [x] Measure
+- [x] ResizeObserver → `primitives::Measure`
+- [x] IntersectionObserver
+- [x] Clipboard — native `write_to_clipboard` / `read_from_clipboard`
+- [x] Tooltip Trigger — owns `Tooltip`: delay, follow mouse, rich content
 
 ## T02 Typography — `src/typography`