logiguard fork v2: patched GPUI on verified 8c74db0 tree

Rebuilt from the exact zed-industries/zed @ 8c74db00c4053d6c0a9037863d7bd048658da4ca
tree (previous orphan was based on a stale/wrong fetch). Same 3-file patch:
  - 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)

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

crates/gpui_platform/Cargo.toml

@@ -0,0 +1,38 @@
+[package]
+name = "gpui_platform"
+version = "0.1.0"
+edition.workspace = true
+publish.workspace = true
+license = "Apache-2.0"
+
+[lints]
+workspace = true
+
+[lib]
+path = "src/gpui_platform.rs"
+
+[features]
+default = []
+font-kit = ["gpui_macos/font-kit"]
+test-support = ["gpui/test-support", "gpui_macos/test-support"]
+screen-capture = ["gpui/screen-capture", "gpui_macos/screen-capture", "gpui_windows/screen-capture", "gpui_linux/screen-capture"]
+runtime_shaders = ["gpui_macos/runtime_shaders"]
+wayland = ["gpui_linux/wayland"]
+x11 = ["gpui_linux/x11"]
+
+[dependencies]
+gpui.workspace = true
+
+[target.'cfg(target_os = "macos")'.dependencies]
+gpui_macos.workspace = true
+
+[target.'cfg(target_os = "windows")'.dependencies]
+gpui_windows.workspace = true
+gpui = { workspace = true, features = ["windows-manifest"] }
+
+[target.'cfg(any(target_os = "linux", target_os = "freebsd"))'.dependencies]
+gpui_linux.workspace = true
+
+[target.'cfg(target_family = "wasm")'.dependencies]
+gpui_web.workspace = true
+console_error_panic_hook = "0.1.7"