fix(boot): end startup LED on green; reset idle timer on mixer touch

Boot color sequence last frame was cyan; use mode-select green instead.
Mixer fader drag returned before ResetAutoPowerCount, so sliding volume could still hit auto power-off.

Co-authored-by: Cursor <cursoragent@cursor.com>

UI/UI_Idle.c

@@ -2,14 +2,14 @@
     
 uint8_t CurrentMode = 0;
 
-/* 样机「开机彩灯」：侧灯全亮色序 蓝→青→红→青（末态保持青） */
+/* 样机「开机彩灯」：侧灯全亮色序 蓝→青→红→绿（末态与模式切换同色绿） */
 void UI_BootLedShow(void)
 {
   static const LedColor_TypeDef seq[] = {
       LED_COLOR_B,
       LED_COLOR_CYA,
       LED_COLOR_R,
-      LED_COLOR_CYA,
+      LED_COLOR_G,
   };
   static const uint16_t hold_ms[] = { 400, 300, 400, 0 };
   uint8_t i;

UI/UI_Mixer.c

@@ -218,6 +218,8 @@ void UI_Mixer_Process(DisplayTaskMessage_Type msg)
   switch(msg.MessageType)
   {
      case MSG_ID_TOUCH:
+       /* 推子拖动会 early-return：须先复位，否则调音台操作无法打断自动关机 */
+       ResetAutoPowerCount();
        tx = msg.HiByte;
        ty = msg.LoByte;
        /* ID=0：抬起，解开推子锁定 */
@@ -255,7 +257,6 @@ void UI_Mixer_Process(DisplayTaskMessage_Type msg)
              break;
          }
        }
-       ResetAutoPowerCount();
   break;
 
   case MSG_ID_EC_VOL: