logiguard fork v3: full patch set on verified 8c74db0 tree

Includes prior-session patches (carry forward so the app compiles):
  - crates/gpui/build.rs: cross-compile manifest fix
  - crates/gpui/src/platform.rs: PlatformWindow::activate_with_token trait method
  - crates/gpui/src/window.rs: Window::activate_with_token public API
  - crates/gpui_linux/src/linux/wayland/window.rs: WaylandWindow::activate_with_token + activate() keyboard-serial fix

Plus the focus-serial fix:
  - serial.rs: SerialKind::KeyboardEnter
  - client.rs: store wl_keyboard.enter serial; latest_serial_of()

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.github/actions/check_style/action.yml

@@ -0,0 +1,9 @@
+name: "Check formatting"
+description: "Checks code formatting use cargo fmt"
+
+runs:
+  using: "composite"
+  steps:
+    - name: cargo fmt
+      shell: bash -euxo pipefail {0}
+      run: cargo fmt --all -- --check