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.

Drivers/pcf8563.c

@@ -310,45 +310,6 @@ bit PCF8563_ReadDateTime(u8 *hour, u8 *min, u8 *sec, u8 *day, u8 *month, u8 *yea
     return 1;
 }
 
-/**
- * @brief 从 PCF8563 读取当前时间 (兼容旧接口，只取时分秒，丢弃日期部分)
- */
-bit PCF8563_ReadTime(u8 *hour, u8 *min, u8 *sec)
-{
-    u8 day, month, year;
-    return PCF8563_ReadDateTime(hour, min, sec, &day, &month, &year);
-}
-
-/**
- * @brief 将时间精准写入 PCF8563 RTC 芯片 (只写时分秒三个寄存器，不触碰日期寄存器)
- */
-bit PCF8563_WriteTime(u8 hour, u8 min, u8 sec)
-{
-    I2C_Start();
-    I2C_SendByte(PCF8563_ADDR_WRITE);
-    if (!I2C_WaitAck()) return 0;
-
-    // 定位写入起始寄存器 0x02
-    I2C_SendByte(REG_VL_SECONDS);
-    if (!I2C_WaitAck()) return 0;
-
-    // 写入秒
-    I2C_SendByte(DEC2BCD(sec & 0x7F));
-    if (!I2C_WaitAck()) return 0;
-
-    // 写入分
-    I2C_SendByte(DEC2BCD(min & 0x7F));
-    if (!I2C_WaitAck()) return 0;
-
-    // 写入时
-    I2C_SendByte(DEC2BCD(hour & 0x3F));
-    if (!I2C_WaitAck()) return 0;
-
-    I2C_Stop();
-
-    return 1;
-}
-
 /**
  * @brief 将时间与日期一次性连续写入 PCF8563 RTC 芯片 (寄存器 0x02~0x08 共 7 字节连续写入)
  */