notebook实装功能，galgame继续，一些bug修复

Assets/scripts/gamePlay_gameplay/HoldNoteController.cs

@@ -13,6 +13,7 @@ public class HoldNoteController : MonoBehaviour
     private bool useAbsolutePositioning = false;
     private Vector3 spawnPosition;
     private float baseSpawnYOffset = 0f; // can be negative to offset upward for delayed segments
+    private float visualOffset = 0f;    // additional Y offset for visual compensation
 
     private void Update()
     {
@@ -44,6 +45,7 @@ public class HoldNoteController : MonoBehaviour
         activationTime = hitTime - travelTime;
         isMoving = false;
         useAbsolutePositioning = false;
+        visualOffset = 0f;
     }
 
     /// <summary>
@@ -54,6 +56,7 @@ public class HoldNoteController : MonoBehaviour
         activationTime = Time.time + segmentDelay;
         isMoving = false;
         useAbsolutePositioning = false;
+        visualOffset = 0f;
     }
 
     public void SetSpeed(float newSpeed)
@@ -66,11 +69,12 @@ public class HoldNoteController : MonoBehaviour
     /// spawnPoint should be the original spawn point for the lane.
     /// baseSpawnYOffset is applied to keep delayed segments offset upward (can be negative).
     /// </summary>
-    public void ConfigureAbsolutePositioning(Vector3 spawnPoint, float newActivationTime, float spawnYOffset)
+    public void ConfigureAbsolutePositioning(Vector3 spawnPoint, float newActivationTime, float spawnYOffset, float newVisualOffset = 0f)
     {
         spawnPosition = spawnPoint;
         activationTime = newActivationTime;
         baseSpawnYOffset = spawnYOffset;
+        visualOffset = newVisualOffset;
         useAbsolutePositioning = true;
         isMoving = true;
 
@@ -81,6 +85,7 @@ public class HoldNoteController : MonoBehaviour
     public void StopMovement()
     {
         isMoving = false;
+        visualOffset = 0f;
     }
 
     private void OnTriggerEnter2D(Collider2D collision)
@@ -109,6 +114,7 @@ public class HoldNoteController : MonoBehaviour
     public bool UsesAbsolutePositioning => useAbsolutePositioning;
     public float BaseSpawnYOffset => baseSpawnYOffset;
     public Vector3 SpawnPosition => spawnPosition;
+    public float VisualOffset => visualOffset;
 
     private void ApplyAbsolutePosition(float time)
     {
@@ -116,7 +122,8 @@ public class HoldNoteController : MonoBehaviour
         float travelDistance = speed * elapsed;
 
         Vector3 newPos = spawnPosition;
-        newPos.y -= (baseSpawnYOffset + travelDistance);
+        // Apply visual offset (positive moves the note down its path earlier)
+        newPos.y -= (baseSpawnYOffset + travelDistance + visualOffset);
         transform.position = newPos;
     }
 }