🩹 Fix LCD_BACKLIGHT_TIMEOUT compile (#24463)

Marlin/src/gcode/gcode.h

     static void M250_report(const bool forReplay=true);
   #endif
 
-  #if HAS_DISPLAY_SLEEP
+  #if HAS_GCODE_M255
     static void M255();
     static void M255_report(const bool forReplay=true);
   #endif

Marlin/src/gcode/lcd/M255.cpp

       const int m = parser.value_int();
       ui.sleep_timeout_minutes = constrain(m, SLEEP_TIMEOUT_MIN, SLEEP_TIMEOUT_MAX);
     #else
-      const int s = parser.value_int() * 60;
+      const unsigned int s = parser.value_ushort() * 60;
       ui.lcd_backlight_timeout = constrain(s, LCD_BKL_TIMEOUT_MIN, LCD_BKL_TIMEOUT_MAX);
     #endif
   }

Marlin/src/inc/Conditionals_adv.h

   #define HAS_PRINT_PROGRESS 1
 #endif
 
+#if ANY(HAS_MARLINUI_MENU, ULTIPANEL_FEEDMULTIPLY, SOFT_RESET_ON_KILL)
+  #define HAS_ENCODER_ACTION 1
+#endif
+
 #if STATUS_MESSAGE_TIMEOUT_SEC > 0
   #define HAS_STATUS_MESSAGE_TIMEOUT 1
 #endif

Marlin/src/lcd/marlinui.h

   #include "tft_io/touch_calibration.h"
 #endif
 
-#if ANY(HAS_MARLINUI_MENU, ULTIPANEL_FEEDMULTIPLY, SOFT_RESET_ON_KILL)
-  #define HAS_ENCODER_ACTION 1
-#endif
-
 #if E_MANUAL > 1
   #define MULTI_E_MANUAL 1
 #endif
   #endif
 
   #if LCD_BACKLIGHT_TIMEOUT
-    #define LCD_BKL_TIMEOUT_MIN 1
-    #define LCD_BKL_TIMEOUT_MAX (60*60*18) // 18 hours max within uint16_t
+    #define LCD_BKL_TIMEOUT_MIN 1u
+    #define LCD_BKL_TIMEOUT_MAX UINT16_MAX // Slightly more than 18 hours
     static uint16_t lcd_backlight_timeout;
     static millis_t backlight_off_ms;
     static void refresh_backlight_timeout();

buildroot/tests/mega2560

 exec_test $1 $2 "MEGA2560 RAMPS | Laser Feature | Air Evacuation | Air Assist | Cooler | Laser Safety Timeout | Flowmeter | 44780 LCD " "$3"
 
 #
-# Test redundant temperature sensors + MAX TC
+# Test redundant temperature sensors + MAX TC + Backlight Timeout
 #
 restore_configs
 opt_set MOTHERBOARD BOARD_RAMPS_14_EFB EXTRUDERS 1 \
         TEMP_SENSOR_0 -2 TEMP_SENSOR_REDUNDANT -2 \
         TEMP_SENSOR_REDUNDANT_SOURCE E1 TEMP_SENSOR_REDUNDANT_TARGET E0 \
-        TEMP_0_CS_PIN 11 TEMP_1_CS_PIN 12
-opt_enable MPCTEMP
+        TEMP_0_CS_PIN 11 TEMP_1_CS_PIN 12 \
+        LCD_BACKLIGHT_TIMEOUT 30
+opt_enable MPCTEMP MINIPANEL
 opt_disable PIDTEMP
-exec_test $1 $2 "MEGA2560 RAMPS | Redundant temperature sensor | 2x MAX6675" "$3"
+exec_test $1 $2 "MEGA2560 RAMPS | Redundant temperature sensor | 2x MAX6675 | BL Timeout" "$3"
 
 #
 # Polargraph Config