[JEWEL-992] Hide mouse cursor while typing in BTF on macOS

[wellingtoncosta]

Summary

Implements cursor hiding behavior on macOS when typing in text fields, matching the native IDE behavior. The cursor automatically hides when the user types and reappears when the mouse moves.

Evidence

Screen.Recording.2026-01-06.at.6.37.57.PM.mov

Implementation Details

Architecture

Added a platform-specific cursor controller abstraction using Compose composition locals:

• PlatformCursorController - Interface for platform-specific cursor control
• StandalonePlatformCursorController - macOS implementation using JNA to call [NSCursor setHiddenUntilMouseMoves:YES]
• BridgePlatformCursorController - Bridge implementation using MacUIUtil.hideCursor()
• NoOpPlatformCursorController - Fallback for unsupported platforms

Integration

• Applied to all InputField components via .hideCursorOnTyping() modifier
• Only active when field is enabled and not read-only
• Provided via LocalPlatformCursorController composition local:
  • IntUiTheme → StandalonePlatformCursorController
  • SwingBridgeTheme → BridgePlatformCursorController

Release notes

New features

• Input Fields: Added automatic cursor hiding on macOS when typing. The cursor hides while typing and reappears when the mouse moves, matching the native macOS behavior seen in IntelliJ Platform text fields (JEWEL-992).

[faogustavo]

No blockers :)