feat: add FlickArea UI component for gesture capture

Assets/Script/FlickArea.cs

@@ -0,0 +1,31 @@
+using UnityEngine;
+using UnityEngine.EventSystems;
+
+public class FlickArea : MonoBehaviour, IPointerDownHandler, IPointerUpHandler
+{
+    public BallShooter ballShooter;
+    
+    private Vector2 startPos;
+    private float startTime;
+
+    public void OnPointerDown(PointerEventData eventData)
+    {
+        startPos = eventData.position;
+        startTime = Time.time;
+    }
+
+    public void OnPointerUp(PointerEventData eventData)
+    {
+        Vector2 endPos = eventData.position;
+        float endTime = Time.time;
+
+        Vector2 swipeDelta = endPos - startPos;
+        float swipeTime = endTime - startTime;
+
+        // Ensure swipeTime is not 0 to avoid division by zero
+        if (swipeTime > 0 && ballShooter != null)
+        {
+            ballShooter.FlickShoot(swipeDelta, swipeTime);
+        }
+    }
+}