refactor: 实现 TriggerThemeChanged 逻辑

Author: ArgoZhang

src/BootstrapBlazor/Services/DefaultThemeProvider.cs

@@ -34,11 +34,8 @@ public async ValueTask SetThemeAsync(string themeName)
     /// <summary>
     /// <inheritdoc/>
     /// </summary>
-    public void TriggerThemeChanged()
+    public void TriggerThemeChanged(string themeName)
     {
-        if (ThemeChangedAsync is not null)
-        {
-            ThemeChangedAsync(string.Empty);
-        }
+        ThemeChangedAsync?.Invoke(themeName);
     }
 }

src/BootstrapBlazor/Services/IThemeProvider.cs

@@ -31,5 +31,6 @@ public interface IThemeProvider
     /// <summary>
     /// Trigger the theme changed event
     /// </summary>
-    void TriggerThemeChanged();
+    /// <param name="themeName">The name of the theme to set.</param>
+    void TriggerThemeChanged(string themeName);
 }