实现btnNewTempRegion按钮功能：移除所有已有测温区并清空叠加层图像

Windows/CS/Framework4.0/Toprie/Toprie/Setting.Designer.cs

@@ -145,6 +145,7 @@ namespace JoyD.Windows.CS
             this.btnNewTempRegion.Size = new System.Drawing.Size(23, 4);
             this.btnNewTempRegion.Text = "新建测温区";
             this.btnNewTempRegion.ToolTipText = "新建测温区";
+            this.btnNewTempRegion.Click += new System.EventHandler(this.BtnNewTempRegion_Click);
             // 
             // btnLoadTempRegion
             // 

Windows/CS/Framework4.0/Toprie/Toprie/Setting.cs

@@ -2999,6 +2999,34 @@ namespace JoyD.Windows.CS
             }
         }
         
+        /// <summary>
+        /// 新建测温区按钮点击事件
+        /// </summary>
+        private void BtnNewTempRegion_Click(object sender, EventArgs e)
+        {
+            try
+            {
+                // 移除所有已有的测温区列表
+                _drawnRectangles.Clear();
+                
+                // 取消选中状态
+                _selectedRegionIndex = -1;
+                
+                // 用透明色清空叠加层图像
+                CreateRectangleOverlayImage();
+                
+                // 触发重绘
+                picBoxTemp.Invalidate();
+                
+                // 更新按钮可见性，设置为就绪状态
+                UpdateButtonsVisibility(0);
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine("新建测温区失败: " + ex.Message);
+            }
+        }
+        
         /// <summary>
         /// 删除按钮点击事件
         /// </summary>