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.

src/tables/grid.rs

@@ -79,7 +79,7 @@ pub(crate) fn grid(face: Face, base: Div, window: &mut Window, cx: &mut App) ->
     }
     if sheet.read(cx).editing && editor.read(cx).field().is_none() {
         sheet.update(cx, |sheet, _| sheet.editing = false);
-        window.focus(&focus);
+        window.focus(&focus, cx);
     }
     let theme = cx.theme();
     let colors = theme.colors.clone();
@@ -356,7 +356,7 @@ pub(crate) fn grid(face: Face, base: Div, window: &mut Window, cx: &mut App) ->
                 return;
             };
             let cell = land(&merges, cell);
-            window.focus(&focus_on_press);
+            window.focus(&focus_on_press, cx);
             pressed.update(cx, |sheet, cx| {
                 sheet.cursor = cell;
                 if !event.modifiers.shift {