logiguard fork: GPUI xdg-activation keyboard-focus serial fix

Single-commit orphan branch: full zed-industries/zed @ 8c74db0 source tree
with a 3-file patch applied (no upstream history).

Patch (crates/gpui_linux/src/linux/wayland/):
  - serial.rs: add SerialKind::KeyboardEnter
  - client.rs: store wl_keyboard.enter serial; add latest_serial_of()
  - window.rs: activate() uses keyboard-enter serial (Mutter focus gate)

Mutter honors window activation only when the token carries the keyboard-
focus serial from wl_keyboard.enter; GPUI used a stale mouse-press serial.
See docs/tray-window-focus-wayland.md in logiguard.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

crates/gpui/examples/uniform_list.rs

@@ -0,0 +1,65 @@
+#![cfg_attr(target_family = "wasm", no_main)]
+
+use gpui::{
+    App, Bounds, Context, Window, WindowBounds, WindowOptions, div, prelude::*, px, rgb, size,
+    uniform_list,
+};
+use gpui_platform::application;
+
+struct UniformListExample {}
+
+impl Render for UniformListExample {
+    fn render(&mut self, _window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
+        div().size_full().bg(rgb(0xffffff)).child(
+            uniform_list(
+                "entries",
+                50,
+                cx.processor(|_this, range, _window, _cx| {
+                    let mut items = Vec::new();
+                    for ix in range {
+                        let item = ix + 1;
+
+                        items.push(
+                            div()
+                                .id(ix)
+                                .px_2()
+                                .cursor_pointer()
+                                .on_click(move |_event, _window, _cx| {
+                                    println!("clicked Item {item:?}");
+                                })
+                                .child(format!("Item {item}")),
+                        );
+                    }
+                    items
+                }),
+            )
+            .h_full(),
+        )
+    }
+}
+
+fn run_example() {
+    application().run(|cx: &mut App| {
+        let bounds = Bounds::centered(None, size(px(300.0), px(300.0)), cx);
+        cx.open_window(
+            WindowOptions {
+                window_bounds: Some(WindowBounds::Windowed(bounds)),
+                ..Default::default()
+            },
+            |_, cx| cx.new(|_| UniformListExample {}),
+        )
+        .unwrap();
+    });
+}
+
+#[cfg(not(target_family = "wasm"))]
+fn main() {
+    run_example();
+}
+
+#[cfg(target_family = "wasm")]
+#[wasm_bindgen::prelude::wasm_bindgen(start)]
+pub fn start() {
+    gpui_platform::web_init();
+    run_example();
+}