[Web] Add hover effects to the Touchable component

[j-piasecki]

Description

Adds hover* props to the Touchable component, which are currently web-only. Those take effect when the pointer moves over the button without pressing it. active props have higher precedence than hover.

Test plan

Updated touchables example

[Copilot]

Pull request overview

This PR adds web-only hover feedback to the v3 Touchable/GestureHandlerButton implementation, allowing opacity/scale/underlay changes when the pointer is over the component (with active/pressed state taking precedence).

Changes:

• Added hoverOpacity, hoverScale, hoverUnderlayOpacity, and hoverAnimationDuration props to GestureHandlerButton / Touchable typings.
• Implemented hover state handling in the web GestureHandlerButton via onPointerEnter / onPointerLeave.
• Updated documentation and the common-app touchables example to showcase hover behavior.

Reviewed changes

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

File	Description
packages/react-native-gesture-handler/src/components/GestureHandlerButton.web.tsx	Implements web hover state and applies hover-driven opacity/scale/underlay transitions.
packages/react-native-gesture-handler/src/components/GestureHandlerButton.tsx	Extends public button prop typings with new hover* props (documented as web-only).
packages/docs-gesture-handler/docs/components/touchable.mdx	Documents the new hover props for the Touchable component on web.
apps/common-app/src/new_api/components/touchable/index.tsx	Adds example UI demonstrating hover-only and hover+press combined states.

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[m-bert]

Love the idea! 🚀