fix(DateTimePicker): 修复在 showWeek 模式下日列表未正确排除 start、end、且 steps 步长不生效的 Bug

[composable-tu]

🤔 这个 PR 的性质是？

• 日常 bug 修复

🔗 相关 Issue

fix #3860

当组件开启 show-week 且 start="{{nowTime()}}" 时，「日」列表界面与未开启 show-week 的「日」列表界面不一致：

1. 开启 show-week 时「日」列显示了 nowTime() 之前的日期，关闭 show-week 后则消失。
2. 开启 show-week 时，steps 步长设置对「日」不生效，关闭则正常。

💡 需求背景和解决方案

应该是在 getOptionByType(type: string) 函数中，if (type === 'date' && showWeek) 直接返回了 getDaysOfWeekInMonth(this.date) 的结果，忽视了 start、end 和 steps 值。

tdesign-miniprogram/src/date-time-picker/date-time-picker.ts

Lines 104 to 121 in b3bdc82

	getDaysOfWeekInMonth(date: Dayjs): Array<{ value: string; label: string }> {
	const { locale, dayjsLocale } = this.data;
	const startOfMonth = date.startOf('month');
	const endOfMonth = date.endOf('month');
	const daysOfWeek = [];
	for (let i = 0; i <= endOfMonth.diff(startOfMonth, 'days'); i += 1) {
	const currentDate = startOfMonth.add(i, 'days').locale(dayjsLocale);
	const dayName = currentDate.format('ddd');
	daysOfWeek.push({
	value: `${i + 1}`,
	label: `${i + 1}${locale.date || ''} ${dayName}`,
	});
	}
	return daysOfWeek;
	},

我这里把上述函数代码改成以下代码就可以了：

    getDaysOfWeekInMonth(date: Dayjs, type: string): Array<{ value: string; label: string }> {
      const { locale, steps, dayjsLocale } = this.data;
      const startOfMonth = date.startOf('month');
      const minEdge = this.getOptionEdge('min', type);
      const maxEdge = this.getOptionEdge('max', type);
      const step = steps?.[type] ?? 1;
      const daysOfWeek = [];

      for (let i = minEdge; i <= maxEdge; i += step) {
        const currentDate = startOfMonth.date(i).locale(dayjsLocale);
        const dayName = currentDate.format('ddd');
        daysOfWeek.push({
          value: `${i}`,
          label: `${i}${locale.date || ''} ${dayName}`,
        });
      }

      return daysOfWeek;
    },

📝 更新日志

• fix(DateTimePicker): 修复 showWeek 模式下日（date）列表未正确排除 start 和 end、且 steps 步长无效的问题

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commit: 8ae177e

[Copilot]

Pull Request Overview

This PR fixes a bug in the DateTimePicker component where the day list in showWeek mode was not properly excluding dates outside the start and end range. When show-week was enabled with start="{{nowTime()}}", the day list showed dates before the start time that should have been filtered out.

• Added proper date range validation using getMinDate() and getMaxDate() methods
• Modified the day generation logic to skip dates outside the allowed range
• Implemented early loop termination when reaching the maximum date

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