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>

script/install-linux

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+set -euxo pipefail
+
+if [[ $# -gt 0 ]]; then
+  echo "
+  Usage: ${0##*/}
+  Builds and installs zed onto your system into ~/.local, making it available as ~/.local/bin/zed.
+
+  Before running this you should ensure you have all the build dependencies installed with `./script/linux`.
+  "
+  exit 1
+fi
+export ZED_CHANNEL=$(<crates/zed/RELEASE_CHANNEL)
+export ZED_UPDATE_EXPLANATION="You need to fetch and rebuild zed in $(pwd)"
+script/bundle-linux
+
+arch="$(uname -m)"
+commit=$(git rev-parse HEAD | cut -c 1-7)
+archive="zed-linux-${arch}.tar.gz"
+export ZED_BUNDLE_PATH="${CARGO_TARGET_DIR:-target}/release/${archive}"
+script/install.sh