This commit confirms that the Wayland-only Hyperion grabber is successfully
capturing frames and sending them to the mock server, which in turn
generates PNG output. This validates the refactoring efforts and the
transition to a Wayland-centric approach.
- Remove all X11-related code and dependencies.
- Create a mock Hyperion server for testing.
- Refactor the main application to be Wayland-only.
- Update the build system and documentation.
