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_wgpu/Cargo.toml

@@ -0,0 +1,46 @@
+[package]
+name = "gpui_wgpu"
+version = "0.1.0"
+edition.workspace = true
+publish.workspace = true
+license = "Apache-2.0"
+
+[lints]
+workspace = true
+
+[lib]
+path = "src/gpui_wgpu.rs"
+
+[features]
+default = []
+font-kit = ["dep:font-kit"]
+
+[dependencies]
+gpui.workspace = true
+anyhow.workspace = true
+bytemuck = "1"
+collections.workspace = true
+cosmic-text = "0.17.0"
+etagere = "0.2"
+itertools.workspace = true
+log.workspace = true
+parking_lot.workspace = true
+profiling.workspace = true
+raw-window-handle = "0.6"
+smallvec.workspace = true
+swash = "0.2.6"
+gpui_util.workspace = true
+wgpu.workspace = true
+
+# Optional: only needed on platforms with multiple font sources (e.g. Linux)
+# 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 }
+
+[target.'cfg(not(target_family = "wasm"))'.dependencies]
+pollster.workspace = true
+
+[target.'cfg(target_family = "wasm")'.dependencies]
+wasm-bindgen.workspace = true
+wasm-bindgen-futures = "0.4"
+web-sys = { version = "0.3", features = ["HtmlCanvasElement"] }
+js-sys = "0.3"