Add a sanity check for valid bed size

Marlin/SanityCheck.h

  * Warnings for old configurations
  */
 #if !defined(X_BED_SIZE) || !defined(Y_BED_SIZE)
-  #error "X_BED_SIZE and BED_Y_SIZE are now required! Please update your configuration."
+  #error "X_BED_SIZE and Y_BED_SIZE are now required! Please update your configuration."
 #elif WATCH_TEMP_PERIOD > 500
   #error "WATCH_TEMP_PERIOD now uses seconds instead of milliseconds."
 #elif DISABLED(THERMAL_PROTECTION_HOTENDS) && (defined(WATCH_TEMP_PERIOD) || defined(THERMAL_PROTECTION_PERIOD))
 #endif
 
 /**
+ * Validate that the bed size fits
+ */
+static_assert(X_MAX_LENGTH >= X_BED_SIZE && Y_MAX_LENGTH >= Y_BED_SIZE,
+  "Movement bounds ([XY]_MIN_POS, [XY]_MAX_POS) are too narrow to contain [XY]_BED_SIZE.");
+
+/**
  * Progress Bar
  */
 #if ENABLED(LCD_PROGRESS_BAR)