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_windows/Cargo.toml

@@ -0,0 +1,46 @@
+[package]
+name = "gpui_windows"
+version = "0.1.0"
+edition.workspace = true
+publish.workspace = true
+license = "Apache-2.0"
+
+[lints]
+workspace = true
+
+[lib]
+path = "src/gpui_windows.rs"
+
+[features]
+default = ["gpui/default"]
+test-support = ["gpui/test-support"]
+screen-capture = ["gpui/screen-capture", "scap"]
+
+[dependencies]
+gpui.workspace = true
+
+[target.'cfg(target_os = "windows")'.dependencies]
+anyhow.workspace = true
+collections.workspace = true
+etagere = "0.2"
+futures.workspace = true
+image.workspace = true
+itertools.workspace = true
+log.workspace = true
+parking_lot.workspace = true
+rand.workspace = true
+raw-window-handle = "0.6"
+smallvec.workspace = true
+util.workspace = true
+uuid.workspace = true
+windows.workspace = true
+windows-core.workspace = true
+windows-numerics = "0.2"
+windows-registry = "0.5"
+
+[target.'cfg(target_os = "windows")'.dependencies.scap]
+workspace = true
+optional = true
+
+[target.'cfg(target_os = "windows")'.build-dependencies]
+windows-registry = "0.5"