feat: increase support for multiple time zones

* 优化实现方法

playground/src/timezone-init.ts

@@ -0,0 +1,20 @@
+import { setTimezoneHandler } from '@vben/stores';
+
+import { getTimezoneApi, getTimezoneOptionsApi, setTimezoneApi } from '#/api';
+
+/**
+ * 初始化时区处理，通过API保存时区设置
+ */
+export function initTimezone() {
+  setTimezoneHandler({
+    getTimezone() {
+      return getTimezoneApi();
+    },
+    setTimezone(timezone: string) {
+      return setTimezoneApi(timezone);
+    },
+    getTimezoneOptions() {
+      return getTimezoneOptionsApi();
+    },
+  });
+}