fix: Fixes failing static pressure tests

Sources/SharedModels/EquipmentMeasurement.swift

@@ -85,13 +85,15 @@ public enum EquipmentMeasurement: Equatable, Sendable {
     }
 
     public var externalStaticPressure: Positive<Double> {
-      var postFilterAdder = Positive<Double>.zero
-      if $postFilterPressure > $manufacturersIncludedFilterPressureDrop {
-        postFilterAdder = $postFilterPressure - $manufacturersIncludedFilterPressureDrop
+      guard $manufacturersIncludedFilterPressureDrop == .zero else {
+        return Positive(
+          ($postFilterPressure.positiveValue - $manufacturersIncludedFilterPressureDrop.positiveValue)
+          + $supplyPlenumPressure.positiveValue
+        )
       }
-      return $returnPlenumPressure
-      + postFilterAdder
-      + $supplyPlenumPressure
+      return Positive(
+        $returnPlenumPressure.positiveValue + $supplyPlenumPressure.positiveValue
+      )
     }
   }
   
@@ -112,7 +114,6 @@ public enum EquipmentMeasurement: Equatable, Sendable {
     }
   }
 
-  // TODO: Needs updated for when forms are using `minmal` values.
   public struct FlaggedMeasurement: Equatable, Sendable {
     public var airflow: Flagged
     public var coilPressureDrop: Flagged
@@ -287,7 +288,11 @@ public enum EquipmentMeasurement: Equatable, Sendable {
     }
 
     public var externalStaticPressure: Positive<Double> {
-      ($postFilterPressure - $manufacturersIncludedFilterPressureDrop) + $preCoilPressure
+      let double = ($postFilterPressure.positiveValue - $manufacturersIncludedFilterPressureDrop.positiveValue)
+      + $preCoilPressure.positiveValue
+      
+//      ($postFilterPressure - $manufacturersIncludedFilterPressureDrop) + $preCoilPressure
+      return Positive(double)
     }
   }
 }