재구성 AX Agent 설정과 채팅 UI를 Claude형 구조로

src/AxCopilot/Services/ClipboardHistoryService.cs

@@ -47,6 +47,7 @@ public class ClipboardHistoryService : IDisposable
     private HwndSource?              _msgSource;
     private readonly object          _lock = new();
     private volatile bool            _ignoreNext; // 자체 클립보드 조작 시 히스토리 추가 방지
+    private uint                     _lastClipboardSequenceNumber;
     private bool                     _disposed;
 
     private readonly List<ClipboardEntry> _history = new();
@@ -332,7 +333,19 @@ public class ClipboardHistoryService : IDisposable
 
     private void OnClipboardUpdate()
     {
-        if (_ignoreNext) { _ignoreNext = false; return; }
+        var sequence = GetClipboardSequenceNumber();
+
+        if (_ignoreNext)
+        {
+            _ignoreNext = false;
+            _lastClipboardSequenceNumber = sequence;
+            return;
+        }
+
+        if (sequence != 0 && sequence == _lastClipboardSequenceNumber)
+            return;
+
+        _lastClipboardSequenceNumber = sequence;
         if (!_settings.Settings.ClipboardHistory.Enabled) return;
 
         Application.Current.Dispatcher.Invoke(() =>
@@ -529,6 +542,9 @@ public class ClipboardHistoryService : IDisposable
 
     [DllImport("user32.dll", SetLastError = true)]
     private static extern bool RemoveClipboardFormatListener(IntPtr hwnd);
+
+    [DllImport("user32.dll")]
+    private static extern uint GetClipboardSequenceNumber();
 }
 
 /// <summary>클립보드 히스토리 단일 항목. 텍스트 또는 이미지 중 하나를 담습니다.</summary>