Port the shared changes from facebook#56298:
- Add onAuxClick/onAuxClickCapture to TouchEventEmitter (shared C++)
- Add AuxClick/AuxClickCapture to ViewEvents in primitives.h
- Add prop conversions in propsConversions.h
- Register topAuxClick as a bubbling event in BaseViewConfig.ios.js
- Add dispatch logic in RCTSurfacePointerHandler.mm (iOS path)
- Type onAuxClick as PointerEvent in PointerEventProps (Flow + TS)

Remove redundant macOS-specific JS registrations since macOS now
inherits the bubbling event from the iOS base config.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Port the shared changes from facebook#56298:
- Add onAuxClick/onAuxClickCapture to TouchEventEmitter (shared C++)
- Add AuxClick/AuxClickCapture to ViewEvents in primitives.h
- Add prop conversions in propsConversions.h
- Register topAuxClick as a bubbling event in BaseViewConfig.ios.js
- Add dispatch logic in RCTSurfacePointerHandler.mm (iOS path)
- Type onAuxClick as PointerEvent in PointerEventProps (Flow + TS)

Remove redundant macOS-specific JS registrations since macOS now
inherits the bubbling event from the iOS base config.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

## Summary
Backport of #2885 to 0.81-stable.

- Add `onAuxClick` event for right-click and middle-click handling on
macOS
- Add `onClick` event for left single-click on plain Views
- Fix `onAuxClick` prop registration in iterator-based setProp path
- Override `rightMouseDown:` to prevent context menu modal from stealing
`rightMouseUp:`
- Add `otherMouseDown:`/`otherMouseUp:` for middle-click support
- Prevent Pressable visual press feedback on non-primary mouse buttons
- Align with upstream facebook#56298 (shared cross-platform
changes)

## Test plan
- Left-click on View → fires `onClick` with `button=0`
- Double-click on View → fires `onDoubleClick` with `button=0`
- Right-click on View → fires `onAuxClick` with `button=2`
- Middle-click on View → fires `onAuxClick` with `button=1`
- Right-click on Pressable → fires `onAuxClick`, does NOT trigger
`onPress` or visual press state

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

## Summary
- Implements `onAuxClick` event, matching the upstream implementation in
[facebook#56298](facebook#56298)
- **Shared changes (from upstream):** Adds
`onAuxClick`/`onAuxClickCapture` to `TouchEventEmitter`, `ViewEvents`
(`primitives.h`), `propsConversions.h`, `BaseViewConfig.ios.js`
(bubbling event), `RCTSurfacePointerHandler.mm` (iOS dispatch), and
`PointerEventProps` types
- **macOS-specific changes:** Since macOS doesn't use
`RCTSurfacePointerHandler.mm` (guarded with `#if !TARGET_OS_OSX`), adds
native wiring through `RCTViewComponentView.mm` (`rightMouseUp:` →
`HostPlatformViewEventEmitter::onAuxClick`)
- Adds a `button` field to the macOS `MouseEvent` struct (W3C spec:
0=left, 1=middle, 2=right)
- Filters non-primary button clicks from triggering `onPress` in
`Pressability`, so right-clicking a `Pressable` no longer fires its
press handler

## Test plan

Event log matches my button presses

<img width="939" height="966" alt="Screenshot 2026-04-08 at 3 38 45 PM"
src="https://github.com/user-attachments/assets/a31c01d4-bfa1-440e-998d-bfd194b6f2f7"
/>




🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>