Port · Build: Zed's gpui at 1a28cff

gpui and gpui_platform now come from Zed's repo by git at 1a28cff,
the code gpui-pre 0.3.7 republishes, so the gallery can later build
for the browser. gpui takes stacker, as 0.2.2 always did, and
gpui_platform takes font-kit, without which macOS draws no text;
runtime_shaders moves to gpui_platform.

The API moved: focus, blur and Tab steps take cx, Corner is Anchor,
shaped lines paint with an alignment, defer_draw takes a content
mask, the inspector registers a factory, async updates return their
value, and wrapped lines are shared, not cloned. Updates through a
window context go through the window, so a closed window still ends
them as it did.

Where the new gpui behaves differently, Ely keeps its old intent.
Holds and reveals under a resting pointer survive typing through
gpui's input-modality-independent hover; previews the keyboard also
moves keep the default, and the calendar's leave ignores a key press.
Enter reaches a button inside the code editor, since gpui now arms a
key click on the press. The event logger skips a lone modifier. A
video and an image grid keep their shape in a flex column under
taffy 0.13, as a picture does.

AGENTS.md records the new stack and the rules this port changes; the
rest of the old gpui and taffy rules are re-tested in T44c.

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

examples/gallery/pages/charts/cartesian.rs

@@ -185,7 +185,7 @@ pub fn realtime(window: &mut Window, cx: &mut App) -> impl IntoElement + use<> {
                 cx.background_executor()
                     .timer(Duration::from_millis(900))
                     .await;
-                let pushed = cx.update(|cx| {
+                cx.update(|cx| {
                     stream.update(cx, |(values, pushed), cx| {
                         let last = values.last().copied().unwrap_or(60.0);
                         values.push((last + (rng() - 0.5) * 10.0).clamp(20.0, 100.0));
@@ -194,9 +194,6 @@ pub fn realtime(window: &mut Window, cx: &mut App) -> impl IntoElement + use<> {
                         cx.notify();
                     })
                 });
-                if pushed.is_err() {
-                    return;
-                }
             }
         })
         .detach();