feat(ui): extend set_clock_app to edit day/month/year, not just time

time_edit_field now cycles through 5 fields (hour/min/day/month/year)
via long-press CONFIRM. Up/down adjusts whichever field is focused,
with day clamped to Days_In_Month() when month/year changes, and
Clock_RecalcWeekday() called after every date edit so the weekday
label stays in sync. UI_UpdateSetTimeDigit() now also refreshes the
weekday abbreviation when editing day/month/year, since the computed
weekday can change independently of which digit was actually touched.
Save writes the full date+weekday via PCF8563_WriteDateTime(). Also
removes PCF8563_ReadTime()/WriteTime(), now unused since every caller
was updated to the DateTime variants directly.

App/ui.h

@@ -91,9 +91,10 @@ void UI_ShowSetTimePage(u8 hour, u8 min, u8 day, u8 month, u8 year, u8 weekday,
 
 /**
  * @brief 局部刷新时间设置界面里正在调节的那一个字段 (小时/分钟/日/月/年)，用于闪烁/调值时避免整屏重绘
+ * @param weekday 根据当前日期算出的星期 (0=周日, ..., 6=周六)，调节日/月/年时顺带刷新星期缩写
  * @param selection 1:小时, 2:分钟, 3:日, 4:月, 5:年
  * @param blink_on 1:显示数值, 0:消隐(涂黑)
  */
-void UI_UpdateSetTimeDigit(u8 hour, u8 min, u8 day, u8 month, u8 year, u8 selection, u8 blink_on);
+void UI_UpdateSetTimeDigit(u8 hour, u8 min, u8 day, u8 month, u8 year, u8 weekday, u8 selection, u8 blink_on);
 
 #endif // __UI_H__