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/pull_request_template.md

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+Self-Review Checklist:
+
+- [ ] I've reviewed my own diff for quality, security, and reliability
+- [ ] Unsafe blocks (if any) have justifying comments
+- [ ] The content is consistent with the [UI/UX checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
+- [ ] Tests cover the new/changed behavior
+- [ ] Performance impact has been considered and is acceptable
+
+Closes #ISSUE
+
+Release Notes:
+
+- N/A or Added/Fixed/Improved ...