Feat: Working on pressure estimations feature

Sources/SharedModels/BudgetedPercentEnvelope.swift

@@ -22,7 +22,11 @@ public struct BudgetedPercentEnvelope: Equatable {
     self.returnPlenumBudget = returnPlenumBudget
     self.supplyPlenumBudget = supplyPlenumBudget
   }
-  
+
+  public var total: Percentage {
+    coilBudget + filterBudget + supplyPlenumBudget + returnPlenumBudget
+  }
+
   public init(equipmentType: EquipmentType, fanType: FanType) {
     switch equipmentType {
     case .furnaceAndCoil:

Sources/SharedModels/FanType.swift

@@ -1,9 +1,11 @@
 import Foundation
 
-public enum FanType: Equatable, CaseIterable, CustomStringConvertible {
+public enum FanType: Hashable, Equatable, CaseIterable, CustomStringConvertible, Identifiable {
   case constantSpeed
   case variableSpeed
-  
+
+  public var id: Self { self }
+
   public var description: String {
     switch self {
     case .constantSpeed:

Sources/SharedModels/Flagged.swift

@@ -157,7 +157,13 @@ extension Flagged.CheckHandler {
   ) -> Self {
     .rated(RatedAirflowLimits(tons: tons, using: ratings), goodMessage: goodMessage)
   }
-  
+
+  public static func percent(
+    goodMessage: Flagged.GoodMessageHandler = .none
+  ) -> Self {
+    .using(maximum: 100, minimum: 100, rated: 100)
+  }
+
   public static func rated<T>(
     _ ratings: RatedEnvelope<T>,
     goodMessage: Flagged.GoodMessageHandler? = nil

Sources/SharedModels/HelperTypes/Percentage.swift

@@ -13,7 +13,8 @@ public struct Percentage: Equatable, RawRepresentable {
   }
   
   public var fraction: Double {
-    self.rawValue / 100
+    get { self.rawValue / 100 }
+    set { self.rawValue = newValue * 100 }
   }
 }