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>

.github/workflows/danger.yml

@@ -0,0 +1,41 @@
+# Generated from xtask::workflows::danger
+# Rebuild with `cargo xtask workflows`.
+name: danger
+on:
+  pull_request:
+    types:
+    - opened
+    - synchronize
+    - reopened
+    - edited
+    branches:
+    - main
+jobs:
+  danger:
+    if: (github.repository_owner == 'zed-industries' || github.repository_owner == 'zed-extensions')
+    runs-on: namespace-profile-2x4-ubuntu-2404
+    steps:
+    - name: steps::checkout_repo
+      uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd
+      with:
+        clean: false
+    - name: steps::setup_pnpm
+      uses: pnpm/action-setup@fe02b34f77f8bc703788d5817da081398fad5dd2
+      with:
+        version: '9'
+    - name: steps::setup_node
+      uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020
+      with:
+        node-version: '20'
+        cache: pnpm
+        cache-dependency-path: script/danger/pnpm-lock.yaml
+    - name: danger::danger_job::install_deps
+      run: pnpm install --dir script/danger
+    - name: danger::danger_job::run
+      run: pnpm run --dir script/danger danger ci
+      env:
+        GITHUB_TOKEN: not_a_real_token
+        DANGER_GITHUB_API_BASE_URL: https://danger-proxy.zed.dev/github
+defaults:
+  run:
+    shell: bash -euxo pipefail {0}