Replace JNA with JNI for macOS native bridge

[kdroidFilter]

Summary

• Replace all JNA (Java Native Access) usage with JNI (Java Native Interface) for macOS, reducing the dependency surface. JNA remains for Windows/Linux.
• Create an Objective-C JNI bridge (MacTrayBridge.m) that wraps the existing Swift C API with proper callback trampolines, GlobalRef lifecycle management, and dynamic JAWT resolution.
• Add new native Swift functions for dock visibility, Space management, and mouse button state — previously done via JNA ObjC runtime calls from Kotlin.
• Rewrite MacTrayManager, MacOsWindowManager, MacOutsideClickWatcher, and related files to use opaque Long handles instead of JNA Structure objects.

Changed files

File	Action
maclib/MacTrayBridge.m	New — JNI bridge (33 native methods)
MacNativeBridge.kt	New — Kotlin JNI binding with auto library loading
maclib/tray.h	Added 8 C function declarations
maclib/tray.swift	Added 7 @_cdecl functions (~80 lines)
maclib/build.sh	Rewritten to compile ObjC bridge with JNI headers
MacTrayManager.kt	Rewritten — opaque handles, no JNA
MacOsWindowManager.kt	Rewritten — native bridge instead of ObjC runtime
MacOutsideClickWatcher.kt	Simplified — removed ApplicationServices JNA
MacOSMenuBarThemeDetector.kt	Adapted to use MacNativeBridge
MacTrayInitializer.kt	getNativeTrayStruct() → getNativeTrayHandle()
TrayPosition.kt	IntByReference → IntArray, uses MacNativeBridge
TrayApp.kt	One-line change: MacNativeBridge.nativeSetMoveToActiveSpace()
MacTrayLoader.kt	Deleted

Test plan

• cd maclib && sh build.sh — both architectures compile
• nm -g libMacTray.dylib | grep Java_ — all 33 JNI symbols exported
• ./gradlew compileKotlinJvm — no compilation errors
• Run demo app on macOS and verify:
  • Tray icon appears with tooltip
  • Left-click callback works
  • Context menu with items, checkables, submenus
  • Menu item callbacks fire correctly
  • Theme change detection (dark/light)
  • Outside click dismiss
  • Show/hide from dock
  • Window positioning near tray icon
  • Space switching works
  • Multi-tray instances