More accurate alarms for Low (Xtreme Smoke) and Full modes

Previously when your grill was in Low or Full mode, alarm notifications would act as if the set point was 180 F° or 600 °F, respectively. For example, if the actual temperature was 195 °F, alarms would claim that “your grill is overheating” above the set point. In reality, those are just the internal codes for each mode.

Low mode attempts to keep the temperature below 200 °F, and Full mode attempts to keep the temperature above 500 °F. Notification messages now reflect that, and the alarm logic now treats 180 °F–200 °F as the effective set point in Low mode, and 500 °F–600 °F in Full mode.

Alarm notifications now say, for example, "Your grill is preheating to Low (<200 °F). We'll let you know when it's ready."