refactor(插件设置): 移除静态属性并优化页面导航逻辑

将 PluginSettingsPage 的 CurrentPlugin 从静态属性改为实例属性，避免状态共享问题
重构 SettingsWindow 的导航逻辑，支持直接传递插件信息并避免重复导航

Ink Canvas/Windows/SettingsViews/Pages/PluginSettingsPage.xaml.cs

@@ -8,14 +8,18 @@ namespace Ink_Canvas.Windows.SettingsViews.Pages
 {
     public partial class PluginSettingsPage : iNKORE.UI.WPF.Modern.Controls.Page
     {
-        private static PluginInfo _currentPlugin;
+        private PluginInfo _currentPlugin;
 
-        public static PluginInfo CurrentPlugin
+        public PluginInfo CurrentPlugin
         {
             get { return _currentPlugin; }
             set
             {
                 _currentPlugin = value;
+                if (IsLoaded && _currentPlugin != null)
+                {
+                    LoadPluginSettings();
+                }
             }
         }
 

Ink Canvas/Windows/SettingsViews/SettingsWindow.xaml.cs

@@ -259,23 +259,26 @@ namespace Ink_Canvas.Windows.SettingsViews
                 string tag = selectedItem.Tag as string;
                 if (!string.IsNullOrEmpty(tag) && _pageTypes.ContainsKey(tag))
                 {
-                    // 如果是插件设置页面，设置当前插件
+                    Ink_Canvas.Plugins.PluginInfo pluginInfo = null;
-                    if (_pluginPages.TryGetValue(tag, out var plugin))
+                    _pluginPages.TryGetValue(tag, out pluginInfo);
-                    {
-                        PluginSettingsPage.CurrentPlugin = plugin;
-                    }
 
-                    // 避免重复导航到当前页面
+                    object cachedPage = null;
-                    if (rootFrame.SourcePageType != _pageTypes[tag])
+                    _pages.TryGetValue(tag, out cachedPage);
+
+                    if (cachedPage == null || rootFrame.Content != cachedPage)
                     {
-                        NavigateToPage(tag);
+                        NavigateToPage(tag, pluginInfo);
+                    }
+                    else if (cachedPage is PluginSettingsPage pluginSettingsPage && pluginInfo != null)
+                    {
+                        pluginSettingsPage.CurrentPlugin = pluginInfo;
                     }
                     NavigationViewControl.Header = selectedItem.Content;
                 }
             }
         }
 
-        public void NavigateToPage(string pageTag)
+        public void NavigateToPage(string pageTag, Ink_Canvas.Plugins.PluginInfo pluginInfo = null)
         {
             if (!_pageTypes.TryGetValue(pageTag, out Type pageType)) return;
 
@@ -289,7 +292,12 @@ namespace Ink_Canvas.Windows.SettingsViews
                     _pages.Add(pageTag, cachedPage);
                 }
 
-                rootFrame.Navigate(cachedPage.GetType(), cachedPage);
+                if (cachedPage is PluginSettingsPage pluginSettingsPage && pluginInfo != null)
+                {
+                    pluginSettingsPage.CurrentPlugin = pluginInfo;
+                }
+
+                rootFrame.Navigate(cachedPage);
             }
             catch (Exception ex)
             {