[Native] Fix host detector when used alongside Activity

[j-piasecki]

Description

Fixes #3965

There were two parts to this isse:

1. currentGestureRef was never reset, so the gesture was never recreated after being dropped
2. Android implementation didn't handle being attached/detached from window

This PR updates useGesture so that it resets the currentGestureRef after dropping the handler. It also updates the Android implementation of the Host Detector component to store all attached handlers on window detach and reattaches them after window attach.

Test plan

See the reproduction from the linked issue.

[Copilot]

Pull request overview

Fixes a regression where hook-based gestures stop working when used inside React 19.2 <Activity> on Android by ensuring gesture handlers can be recreated and host-detector-attached handlers survive window detach/attach cycles.

Changes:

• Reset currentGestureRef when dropping a hook gesture handler so it can be recreated later.
• Update Android Host Detector view to detach/re-attach handlers on window detach/attach.
• Switch detector view manager teardown to explicitly detach all handlers on view drop.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
packages/react-native-gesture-handler/src/v3/hooks/useGesture.ts	Resets the stored “current gesture” ref on cleanup to allow handler recreation after dropping.
packages/react-native-gesture-handler/android/src/main/java/com/swmansion/gesturehandler/react/RNGestureHandlerDetectorViewManager.kt	Ensures handlers are detached during view drop via detachAllHandlers().
packages/react-native-gesture-handler/android/src/main/java/com/swmansion/gesturehandler/react/RNGestureHandlerDetectorView.kt	Adds attach/detach window lifecycle handling and expands detachAllHandlers() to include native handlers.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

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