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/typography/fit.rs

@@ -128,7 +128,14 @@ fn cut_line(text: SharedString, fit: fn(&str, Pixels, &mut Window) -> String) ->
                     let line = style.line_height_in_pixels(window.rem_size());
                     let x = offset(style.text_align, bounds.size.width - shaped.width);
                     shaped
-                        .paint(bounds.origin + point(x, Pixels::ZERO), line, window, cx)
+                        .paint(
+                            bounds.origin + point(x, Pixels::ZERO),
+                            line,
+                            TextAlign::Left,
+                            None,
+                            window,
+                            cx,
+                        )
                         .expect("a cut line paints");
                 },
             )