Replace KD_UNUSED macro with [[maybe_unused]] attribute

[Copilot]

Replace custom KD_UNUSED macro with C++17 standard [[maybe_unused]] attribute to align with existing codebase style in mosquitto_wrapper.h.

Changes

• Function parameters: Applied [[maybe_unused]] directly to parameter declarations in function signatures

  • window.cpp: Event handlers (mouse/keyboard events)
  • linux_xcb_platform_integration.cpp: dumpScreenInfo()

• Local variables: Moved attribute to variable declaration instead of separate statement

  • linux_xcb_platform_event_loop.cpp: Event pointers in XCB event handlers

Example

// Before
void Window::keyPressEvent(KeyPressEvent *ev)
{
    KD_UNUSED(ev); // for release builds, debug log isn't compiled in
    SPDLOG_LOGGER_DEBUG(m_logger, "{}() key = {}", __FUNCTION__, ev->key());
}

// After
void Window::keyPressEvent([[maybe_unused]] KeyPressEvent *ev)
{
    SPDLOG_LOGGER_DEBUG(m_logger, "{}() key = {}", __FUNCTION__, ev->key());
}

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