Improve temperature accuracy and layout

TempTrack/Temperature/TemperatureMeasurement.swift

@@ -53,10 +53,7 @@ struct TemperatureMeasurement: Identifiable {
     }
 
     var displayText: String {
-        guard let averageValue else {
-            return "-"
-        }
-        return String(format: "%.1f °C", averageValue)
+        "\(sensor0.text) / \(sensor1.text)"
     }
 }
 

TempTrack/Temperature/TemperatureValue.swift

@@ -23,7 +23,7 @@ enum TemperatureValue {
         case .invalidMeasurement:
             return 1
         case .value(let double):
-            let value = Int(double + 40) * 2
+            let value = (double * 2).roundedInt + 80
             return UInt8(clamping: value)
         }
     }
@@ -45,11 +45,11 @@ enum TemperatureValue {
     var text: String {
         switch self {
         case .notFound:
-            return "No sensor"
+            return "-"
         case .invalidMeasurement:
-            return "Invalid"
+            return "?"
         case .value(let value):
-            return String(format:"%.1f°C", value)
+            return String(format:"%.1f°", value)
         }
     }
 }