fix: 顶栏颜色跟随小程序主题并保留跟随系统

src/utils/store.ts

@@ -2,6 +2,7 @@ import Taro from '@tarojs/taro'
 import type { DesignItem, OrderItem, AddressItem, StickerItem } from '../types'
 import { PRODUCT_ICON_MAP } from './productConfig'
 
+import { invalidateAuthCache } from './authState'
 // 重新导出类型，供各页面从 store 直接引用（修正原「声明但不导出」的编译错误）
 export type { DesignItem, OrderItem, AddressItem, StickerItem }
 
@@ -66,6 +67,8 @@ export function setUserInfoRaw(info: any) {
     Taro.setStorageSync(`user_info_${info.openid}`, info)
     saveToRegistry(info.openid)
   }
+  invalidateAuthCache()
+  Taro.eventCenter?.trigger('authStateChanged', { openid: info?.openid || '' })
 }
 
 export function getUserInfoByOpenid(openid: string): any | null {
@@ -82,6 +85,8 @@ export function clearUserInfo() {
   // 仅退出登录，不删除用户数据
   Taro.removeStorageSync(USER_KEY)
   Taro.removeStorageSync(ACTIVE_USER_KEY)
+  invalidateAuthCache()
+  Taro.eventCenter?.trigger('authStateChanged', { openid: '' })
 }
 
 export function setUserInfo(info: any) {
@@ -259,17 +264,23 @@ export function setTheme(theme: ThemeMode) {
   Taro.setStorageSync(THEME_KEY, theme)
 }
 
+// 跟随系统模式下，系统主题由 onThemeChange/getAppBaseInfo 写入缓存，供 resolveTheme 使用
+let detectedSystemTheme: 'light' | 'dark' | null = null
+
+export function setDetectedSystemTheme(t: 'light' | 'dark'): void {
+  detectedSystemTheme = t
+}
+
 /** 根据自动模式解析实际生效主题 */
 export function resolveTheme(mode: ThemeMode): 'light' | 'dark' {
   if (mode === 'auto') {
-    // 需 app.json 开启 darkmode 后 theme 字段才有效；getSystemInfoSync 已废弃，改用 getAppBaseInfo
+    // darkmode 开启后 getAppBaseInfo().theme 能拿到系统主题；缓存仅用于启动时加速
+    if (detectedSystemTheme) return detectedSystemTheme
     try {
       const info = Taro.getAppBaseInfo()
-      return info.theme === 'dark' ? 'dark' : 'light'
-    } catch {
-      const info = Taro.getSystemInfoSync()
-      return info.theme === 'dark' ? 'dark' : 'light'
-    }
+      if (info.theme === 'dark' || info.theme === 'light') return info.theme
+    } catch { /* ignore */ }
+    return 'light'
   }
   return mode
 }