Initial commit

Assets/_Project/Scripts/Code/InteractionLayer/Interactables/GrabInteractable.cs

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+using UnityEngine;
+
+/// <summary>
+/// Data/configuration component placed on block prefabs.
+/// Stores per-prefab drag settings so GhostManager can read them at instantiation time.
+/// All drag, snap, and placement logic has moved to GhostManager.
+/// </summary>
+public class GrabInteractable : MonoBehaviour
+{
+    [Header("Attachment")]
+    [SerializeField] private Transform attachPoint;
+
+    [Header("Surface Alignment")]
+    public bool alignToSurfaceNormal = true;
+    public float alignmentSpeed = 15f;
+    public bool snapRotation = false;
+
+    [Header("Movement")]
+    public float followSpeed = 20f;
+    public float heightOffset = 0f;
+
+    [Header("Validation & Visuals")]
+    [SerializeField] private IValidator validator;
+    public Color validTint = new Color(0.5f, 1.0f, 0.5f, 1.0f);
+    public Color invalidTint = new Color(1.0f, 0.5f, 0.5f, 1.0f);
+
+    /// <summary>Returns the designated attach/pivot point, or this transform if none is set.</summary>
+    public Transform GetAttachPoint() => attachPoint;
+
+    /// <summary>Returns the PlacementValidator – checks the component on this GameObject as fallback.</summary>
+    public IValidator GetValidator() => validator != null ? validator : GetComponent<IValidator>();
+}