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/fs/Cargo.toml

@@ -0,0 +1,62 @@
+[package]
+name = "fs"
+version = "0.1.0"
+edition.workspace = true
+publish.workspace = true
+license = "GPL-3.0-or-later"
+
+[lints]
+workspace = true
+
+[lib]
+path = "src/fs.rs"
+test = false
+
+[[test]]
+name = "integration"
+required-features = ["test-support"]
+path = "tests/integration/main.rs"
+
+[dependencies]
+anyhow.workspace = true
+async-channel.workspace = true
+async-tar.workspace = true
+async-trait.workspace = true
+collections.workspace = true
+futures.workspace = true
+git.workspace = true
+gpui.workspace = true
+ignore.workspace = true
+libc.workspace = true
+log.workspace = true
+parking_lot.workspace = true
+paths.workspace = true
+rope.workspace = true
+proto.workspace = true
+thiserror.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+smol.workspace = true
+telemetry.workspace = true
+tempfile.workspace = true
+text.workspace = true
+time.workspace = true
+util.workspace = true
+is_executable = "1.0.5"
+notify = "8.2.0"
+trash = { git = "https://github.com/zed-industries/trash-rs", rev = "3bf27effd4eb8699f2e484d3326b852fe3e53af7" }
+
+[target.'cfg(target_os = "windows")'.dependencies]
+windows.workspace = true
+dunce.workspace = true
+
+[target.'cfg(any(target_os = "linux", target_os = "freebsd"))'.dependencies]
+ashpd.workspace = true
+
+[dev-dependencies]
+fs = { workspace = true, features = ["test-support"] }
+gpui = { workspace = true, features = ["test-support"] }
+git = { workspace = true, features = ["test-support"] }
+
+[features]
+test-support = ["gpui/test-support", "git/test-support", "util/test-support"]