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/snap-try

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+# This script is intended to be run after `snap-build`.
+#
+# It expects a version to be passed as the first argument, and expects
+# the built `.snap` for that version to be in the current directory.
+#
+# This will uninstall the current `zed` snap, replacing it with a snap
+# that directly uses the `snap/unpacked` directory.
+
+set -euxo pipefail
+
+if [ "$#" -ne 1 ]; then
+  echo "Usage: $0 <release_version>"
+  exit 1
+fi
+
+# Rerun as root
+[ "$UID" -eq 0 ] || exec sudo bash -e "$0" "$@"
+
+snap remove zed || true
+mkdir -p snap
+rm -rf snap/unpacked
+unsquashfs -dest snap/unpacked "zed_$1_amd64.snap"
+snap try --classic snap/unpacked