docs: fix datepicker week firstdayofweek usage demo

src/date-picker/_example-composition/week.vue

@@ -1,6 +1,21 @@
 <template>
   <t-space direction="vertical">
-    <t-date-picker mode="week" clearable allow-input />
-    <t-date-range-picker mode="week" clearable allow-input />
+    <t-date-picker mode="week" clearable allow-input :first-day-of-week="weekStart" />
+
+    <t-date-range-picker mode="week" clearable allow-input :first-day-of-week="weekStart" />
   </t-space>
 </template>
+<script setup>
+// 如果配合 firstDayOfWeek API 使用，请使用 dayjs 同步修改 weekStart，否则部分日期选择会用异常
+import { ref } from 'vue';
+
+import dayjs from 'dayjs';
+import updateLocale from 'dayjs/plugin/updateLocale';
+
+dayjs.extend(updateLocale);
+
+dayjs.updateLocale('zh-cn', {
+  weekStart: 2,
+});
+const weekStart = ref(2);
+</script>

src/date-picker/_example/week.vue

@@ -1,6 +1,26 @@
 <template>
   <t-space direction="vertical">
-    <t-date-picker mode="week" clearable allow-input />
-    <t-date-range-picker mode="week" clearable allow-input />
+    <t-date-picker mode="week" clearable allow-input :first-day-of-week="weekStart" />
+
+    <t-date-range-picker mode="week" clearable allow-input :first-day-of-week="weekStart" />
   </t-space>
 </template>
+<script>
+// 如果配合 firstDayOfWeek API 使用，请使用 dayjs 同步修改 weekStart，否则部分日期选择会用异常
+import dayjs from 'dayjs';
+import updateLocale from 'dayjs/plugin/updateLocale';
+
+dayjs.extend(updateLocale);
+
+dayjs.updateLocale('zh-cn', {
+  weekStart: 2,
+});
+
+export default {
+  data() {
+    return {
+      weekStart: 2,
+    };
+  },
+};
+</script>