fix(macos): raise inactive windows on synthetic content clicks

[mouzhi]

Summary

• macOS 27 no longer focuses/raises inactive windows when a synthetic click lands on the window body
• title-bar clicks still work, but content-area clicks can interact without activating the target window
• keyboard input then stays on the previous frontmost app

Fix

Before posting LeftMouseDown, look up the Accessibility element under the pointer and:

• AXRaise the owning window
• set AXMain / AXFocused on the window when available
• set AXFrontmost on the owning application

This is a compatibility workaround for the macOS 27 synthetic-event regression.

Test plan

• Build lan-mouse on macOS aarch64
• Control a macOS 27 machine from Windows via lan-mouse
• Click an inactive/background window title bar → still focuses/raises
• Click an inactive/background window content area → now focuses/raises and accepts keyboard input
• Verify Accessibility + Input Monitoring remain granted after installing the patched binary

Fixes #464