fix(@vben-core/preferences): sync theme before reset persistence (#8336)

* fix(@vben-core/preferences): sync theme before reset persistence

* chore: format preference reset changeset

.changeset/calm-themes-reset.md

@@ -0,0 +1,5 @@
+---
+'@vben-core/preferences': patch
+---
+
+fix: apply preference reset theme updates before cache persistence

packages/@core/preferences/__tests__/preferences.test.ts

@@ -157,6 +157,22 @@ describe('preferences', () => {
     expect(preferenceManager.getPreferences()).toEqual(defaultPreferences);
   });
 
+  it('applies reset side effects before persisting preferences', async () => {
+    preferenceManager.updatePreferences({
+      theme: {
+        mode: 'light',
+      },
+    });
+    expect(document.documentElement.classList.contains('dark')).toBe(false);
+
+    const resetPromise = preferenceManager.resetPreferences();
+
+    expect(preferenceManager.getPreferences().theme.mode).toBe('dark');
+    expect(document.documentElement.classList.contains('dark')).toBe(true);
+
+    await resetPromise;
+  });
+
   it('updates isMobile correctly', () => {
     // 模拟移动端状态
     vi.stubGlobal(

packages/@core/preferences/src/preferences.ts

@@ -177,11 +177,11 @@ class PreferenceManager {
     Object.assign(this.state, this.initialPreferences);
     this.replaceCustomPreferences(this.initialCustomPreferences);
 
-    // 保存偏好设置至缓存
-    await this.saveToCache();
-
     // 直接触发 UI 更新
     this.handleUpdates(this.state);
+
+    // 保存偏好设置至缓存
+    await this.saveToCache();
   };
 
   /**