[Android] Fix text getting selected during gestures

[j-piasecki]

Description

Fixes #3866

When a gesture activates, the root helper's shouldIntercept flips to true, causing it to stop delivering events to the OS touch handling path. If a native view tries to detect a long press, it's possible that the event stream will stop on a MOVE event, triggering the long press action.

This PR adds a native view cancellation step - when shouldIntercept flips, all views on the path from the root to the leaf that received the touch receive a synthetic CANCEL event, preventing that from happening.

Views with an active NativeViewGestureHandler attached to them are exempt from that mechanism, since the cancel event would cause them to stop recognizing the event mid-stream and they've been explicitly opted in to the RNGH touch system.

Note: the logic to find views to cancel relies on the DOWN coordinates for each pointer instead of the current ones - the goal is to cancel views that have possibly handled the DOWN event and started their own logic.

Test plan

Tested on the issue reproducer

[Copilot]

Pull request overview

This PR addresses Android text selection/long-press side effects that can occur when RNGH begins intercepting mid-gesture by proactively sending a synthetic ACTION_CANCEL to the native view(s) that originally received the touch down sequence (unless that view is explicitly opted into RNGH via an active/non-conflicting NativeViewGestureHandler).

Changes:

• Trigger native-view cancellation when RNGestureHandlerRootHelper transitions into interception (shouldIntercept flips to true).
• Track per-pointer DOWN coordinates in the orchestrator and use them to find the touched view path (leaf-to-root) at the initial touch location.
• Dispatch a synthetic ACTION_CANCEL to collected views, exempting views still driven by an active/non-conflicting NativeViewGestureHandler.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/react-native-gesture-handler/android/src/main/java/com/swmansion/gesturehandler/react/RNGestureHandlerRootHelper.kt	Calls into orchestrator to cancel native touches exactly when interception starts.
packages/react-native-gesture-handler/android/src/main/java/com/swmansion/gesturehandler/core/GestureHandlerOrchestrator.kt	Tracks pointer down points, collects touched view paths, and dispatches synthetic cancel events with NVGH exemptions.

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