UI HUGE UPDATE

Assets/scripts/friendSystem/friendCardPrefab.cs

@@ -27,6 +27,10 @@ public class friendCardPrefab : MonoBehaviour
     [Header("offline heibai")]
     [SerializeField] private Material offline_material;
 
+    [Header("currently chatting")]
+    [SerializeField] private Sprite chattingSprite;
+    [SerializeField] private Sprite normalSprite;
+
     private Material _profileBorderMaterial;
     private Material _friendProfileMaterial;
     private Coroutine _avatarLoadRoutine;
@@ -39,11 +43,20 @@ public class friendCardPrefab : MonoBehaviour
     private Action<string> _openDetails;
     private Action<string> _openPrivateConversation;
     private bool _bindingToggle;
+    private Sprite _defaultProfileBorderSprite;
+    private bool _subscribedToChatState;
 
     private void Awake()
     {
         _profileBorderMaterial = profileBorder != null ? profileBorder.material : null;
         _friendProfileMaterial = friendProfile != null ? friendProfile.material : null;
+        _defaultProfileBorderSprite = profileBorder != null ? profileBorder.sprite : null;
+    }
+
+    private void OnEnable()
+    {
+        SubscribeChatState();
+        RefreshChattingVisual();
     }
 
     private void OnDestroy()
@@ -55,6 +68,12 @@ public class friendCardPrefab : MonoBehaviour
         }
 
         ReleaseRuntimeAvatarResources();
+        UnsubscribeChatState();
+    }
+
+    private void OnDisable()
+    {
+        UnsubscribeChatState();
     }
 
     public void Bind(FriendCardViewData data, Action<string, bool> onStarChanged, Action<string> onOpenDetails, Action<string> onOpenPrivateConversation)
@@ -102,6 +121,8 @@ public class friendCardPrefab : MonoBehaviour
             StopCoroutine(_avatarLoadRoutine);
         }
         _avatarLoadRoutine = StartCoroutine(LoadAvatarRoutine(data));
+
+        RefreshChattingVisual();
     }
 
     private void HandleStarToggleChanged(bool isOn)
@@ -143,6 +164,53 @@ public class friendCardPrefab : MonoBehaviour
         {
             friendProfile.material = profileMaterial;
         }
+
+        RefreshChattingVisual();
+    }
+
+    private void SubscribeChatState()
+    {
+        if (_subscribedToChatState)
+        {
+            return;
+        }
+
+        globalChatSystem.ActivePrivateConversationChanged += HandleActivePrivateConversationChanged;
+        _subscribedToChatState = true;
+    }
+
+    private void UnsubscribeChatState()
+    {
+        if (!_subscribedToChatState)
+        {
+            return;
+        }
+
+        globalChatSystem.ActivePrivateConversationChanged -= HandleActivePrivateConversationChanged;
+        _subscribedToChatState = false;
+    }
+
+    private void HandleActivePrivateConversationChanged(string _)
+    {
+        RefreshChattingVisual();
+    }
+
+    private void RefreshChattingVisual()
+    {
+        if (profileBorder == null)
+        {
+            return;
+        }
+
+        bool isCurrentPrivateTarget = globalChatSystem.IsViewingPrivateConversation(_steamId);
+        Sprite targetSprite = isCurrentPrivateTarget
+            ? (chattingSprite != null ? chattingSprite : normalSprite)
+            : (normalSprite != null ? normalSprite : _defaultProfileBorderSprite);
+
+        if (targetSprite != null)
+        {
+            profileBorder.sprite = targetSprite;
+        }
     }
 
     private IEnumerator LoadAvatarRoutine(FriendCardViewData data)