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_macos/Cargo.toml

@@ -0,0 +1,73 @@
+[package]
+name = "gpui_macos"
+version = "0.1.0"
+edition.workspace = true
+publish.workspace = true
+license = "Apache-2.0"
+
+[lints]
+workspace = true
+
+[lib]
+path = "src/gpui_macos.rs"
+
+[features]
+default = ["gpui/default"]
+test-support = ["gpui/test-support"]
+runtime_shaders = []
+font-kit = ["dep:font-kit"]
+screen-capture = ["gpui/screen-capture"]
+
+[dependencies]
+gpui.workspace = true
+
+[target.'cfg(target_os = "macos")'.dependencies]
+anyhow.workspace = true
+async-task = "4.7"
+block = "0.1"
+cocoa.workspace = true
+collections.workspace = true
+core-foundation.workspace = true
+core-foundation-sys.workspace = true
+core-graphics = "0.24"
+core-text = "21"
+core-video.workspace = true
+ctor.workspace = true
+derive_more.workspace = true
+dispatch2 = "0.3.1"
+etagere = "0.2"
+# WARNING: If you change this, you must also publish a new version of zed-font-kit to crates.io
+font-kit = { git = "https://github.com/zed-industries/font-kit", rev = "94b0f28166665e8fd2f53ff6d268a14955c82269", package = "zed-font-kit", version = "0.14.1-zed", optional = true }
+foreign-types = "0.5"
+futures.workspace = true
+image.workspace = true
+itertools.workspace = true
+libc.workspace = true
+log.workspace = true
+mach2.workspace = true
+media.workspace = true
+metal.workspace = true
+objc.workspace = true
+objc2-app-kit.workspace = true
+parking_lot.workspace = true
+pathfinder_geometry = "0.5"
+raw-window-handle = "0.6"
+semver.workspace = true
+smallvec.workspace = true
+strum.workspace = true
+util.workspace = true
+uuid.workspace = true
+
+[target.'cfg(target_os = "macos")'.build-dependencies]
+cbindgen = { version = "0.28.0", default-features = false }
+gpui.workspace = true
+
+# When this crate is itself being tested (cargo test -p gpui_macos), its own
+# cfg(test) flag enables impls of test-only traits like PlatformHeadlessRenderer
+# and PlatformWindow::render_to_image. Those traits/methods only exist in gpui
+# when gpui's `test-support` feature is on, so we have to turn that feature on
+# as a dev-dependency. The `cfg(test)` flag of a dependent crate doesn't
+# propagate to its dependencies, but dev-dependencies do, so this is the
+# correct way to enable the feature exactly when needed.
+[target.'cfg(target_os = "macos")'.dev-dependencies]
+gpui = { workspace = true, features = ["test-support"] }