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/finance/steer.rs

@@ -1,9 +1,9 @@
 use std::rc::Rc;
 
 use gpui::{
-    App, Bounds, Div, Entity, InteractiveElement, MouseButton, MouseDownEvent, MouseMoveEvent,
-    MouseUpEvent, Pixels, Point, ScrollWheelEvent, Stateful, StatefulInteractiveElement, Styled,
-    Subscription, Window,
+    App, Bounds, Div, Entity, HoverListenerMode, InteractiveElement, MouseButton, MouseDownEvent,
+    MouseMoveEvent, MouseUpEvent, Pixels, Point, ScrollWheelEvent, Stateful,
+    StatefulInteractiveElement, Styled, Subscription, Window,
 };
 
 use super::{
@@ -167,6 +167,7 @@ impl Steering {
                 cx.stop_propagation();
                 hold(&wheeled, &sync_wheel, cx, Some(next), None);
             })
+            .hover_listener_mode(HoverListenerMode::InputModalityIndependent)
             .on_hover(move |inside, _, cx| {
                 if !*inside {
                     left.update(cx, |stage, _| {