feat: 优化第一次启动时的弹窗提醒

MainForm.cs

@@ -524,15 +524,14 @@ namespace TimerApp
             notifyIcon1.ShowBalloonTip(3000, "休息结束", "继续加油工作吧！", ToolTipIcon.Info);
         }
 
-        private bool _hasShownMinimizeTip = false;
-
         private void btnHide_Click(object sender, EventArgs e)
         {
             this.Hide();
-            if (!_hasShownMinimizeTip)
+            if (!_settings.HasShownMinimizeTip)
             {
                 notifyIcon1.ShowBalloonTip(2000, "已隐藏", "程序仍在后台运行，双击托盘图标恢复。", ToolTipIcon.Info);
-                _hasShownMinimizeTip = true;
+                _settings.HasShownMinimizeTip = true;
+                _settings.Save();
             }
         }
 
@@ -542,10 +541,11 @@ namespace TimerApp
             {
                 e.Cancel = true;
                 this.Hide();
-                if (!_hasShownMinimizeTip)
+                if (!_settings.HasShownMinimizeTip)
                 {
                     notifyIcon1.ShowBalloonTip(2000, "已隐藏", "程序仍在后台运行，双击托盘图标恢复。", ToolTipIcon.Info);
-                    _hasShownMinimizeTip = true;
+                    _settings.HasShownMinimizeTip = true;
+                    _settings.Save();
                 }
             }
             else