fix: apple watch delta

Trio/Sources/Services/LiveActivity/LiveActivityAttributes+Helper.swift

@@ -55,7 +55,7 @@ extension LiveActivityAttributes.ContentState {
             formatter.minimumFractionDigits = 1
             formatter.maximumFractionDigits = 1
         }
-        
+
         let delta = lastGlucose - secondLastGlucose
         return formatter.string(from: delta as NSNumber) ?? "--"
     }

Trio/Sources/Services/WatchManager/AppleWatchManager.swift

@@ -320,12 +320,14 @@ final class BaseWatchManager: NSObject, WCSessionDelegate, Injectable, WatchMana
 
                 // Calculate delta if we have at least 2 readings
                 if glucoseObjects.count >= 2 {
-                    var deltaValue = Decimal(glucoseObjects[0].glucose - glucoseObjects[1].glucose)
-
+                    var glucoseLast = Decimal(glucoseObjects[0].glucose)
+                    var glucoseSecondLast = Decimal(glucoseObjects[1].glucose)
                     if self.units == .mmolL {
-                        deltaValue = Double(truncating: deltaValue as NSNumber).asMmolL
+                        glucoseLast = glucoseLast.asMmolL
+                        glucoseSecondLast = glucoseSecondLast.asMmolL
                     }
-
+                    
+                    let deltaValue = glucoseLast - glucoseSecondLast
                     let formattedDelta = Formatter.glucoseFormatter(for: self.units)
                         .string(from: deltaValue as NSNumber) ?? "0"
                     watchState.delta = deltaValue < 0 ? "\(formattedDelta)" : "+\(formattedDelta)"