[iOS] Fix LegacyPressable not emitting onPressOut

[j-piasecki]

Description

Fixes the LegacyPressable on iOS getting stuck due to an unhandled NATIVE_START event. Updates the non-legacy implementation to also dispatch the NATIVE_START, which is now expected by the state machine.

Test plan

Before	After
Simulator.Screen.Recording.-.iPhone.17.Pro.-.2026-04-27.at.07.52.42.mov	Simulator.Screen.Recording.-.iPhone.17.Pro.-.2026-04-27.at.07.52.29.mov

[Copilot]

Pull request overview

Fixes an iOS-specific LegacyPressable press lifecycle issue where onPressOut could fail to fire due to the state machine resetting on an unexpected NATIVE_START event, and keeps the v3 Pressable implementation aligned with the updated state machine expectations.

Changes:

• Add NATIVE_START to the iOS Pressable state machine definition so the event no longer causes a reset mid-sequence.
• Update v3 Pressable to dispatch NATIVE_START on iOS (still excluded on Android due to the existing hitSlop issue).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/react-native-gesture-handler/src/v3/components/Pressable.tsx	Dispatches NATIVE_START for iOS to match the state machine’s expected event sequence.
packages/react-native-gesture-handler/src/components/Pressable/stateDefinitions.ts	Updates iOS state sequence to include NATIVE_START, preventing iOS from getting stuck before FINALIZE.

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