[Incubator.Slider] Fix Android hitSlop on thumb

[adids1221]

Description

Fixes an Android bug where touches near the Incubator.Slider thumb fail to start a drag.

Added .hitSlop() to the RNGH Gesture.Pan() on the thumb, so the gesture handler natively recognizes touches in the expanded hit area on Android.
hitSlop now works consistently on both platforms.

Changelog

Incubator.Slider - Fixed Android bug where touches near the thumb failed to start a drag.

Additional info

• MADS-4866

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[adids1221]

How to reproduce

Drop this into PlaygroundScreen.tsx and test on Android:

import React, {useState} from 'react';
import {Platform} from 'react-native';
import {View, Text, Switch, Incubator} from 'react-native-ui-lib';

const TAG = `[Slider-${Platform.OS}]`;

export default function PlaygroundScreen() {
  const [disabled, setDisabled] = useState(false);

  return (
    <View flex padding-20>
      <Text text60 marginB-20>
        Slider Debug ({Platform.OS})
      </Text>

      <View row centerV marginB-20>
        <Text text70 marginR-10>
          Disabled
        </Text>
        <Switch value={disabled} onValueChange={setDisabled}/>
      </View>

      <Text text70 marginT-40 marginB-10>
        Incubator.Slider
      </Text>
      <View
        style={{width: '100%', height: 60, justifyContent: 'center'}}
        onTouchStart={() => console.log(`${TAG} - PARENT onTouchStart (Incubator)`)}
        onTouchEnd={() => console.log(`${TAG} - PARENT onTouchEnd (Incubator)`)}
      >
        <Incubator.Slider
          value={30}
          minimumValue={0}
          maximumValue={100}
          disabled={disabled}
          onSeekStart={() => console.log(`${TAG} - Incubator.Slider - onSeekStart`)}
          onSeekEnd={() => console.log(`${TAG} - Incubator.Slider - onSeekEnd`)}
          onValueChange={(v: number) => console.log(`${TAG} - Incubator.Slider - onValueChange: ${v.toFixed(1)}`)}
        />
      </View>
    </View>
  );
}

What to test

• Android — main fix: Touch near the thumb (not exactly on it) and drag → should start dragging immediately
• Both platforms — track tap: Tap anywhere on the track away from the thumb → value should jump to that position
• Both platforms — normal drag: Grab the thumb and drag → should work smoothly

[adids1221]

Replace #3951