Optimize affiliate system and add locale-aware defaults

- Show BOM button for unsaved loads (no longer requires save first)
- Set US fallback affiliate tag for unknown countries
- Localize Amazon search queries in all 5 languages (EN/DE/ES/FR/NL)
- Add affiliate URL/country fields to SavedBattery model
- Auto-detect unit system (imperial for US locale, metric otherwise)
- Set charger input voltage based on locale (120V US, 230V EU)
- Remove StoreKitManager and CableProPaywallView
- Add CLAUDE.md project instructions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,63 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Build & Test Commands
+
+```bash
+# Build
+xcodebuild -scheme Cable -destination 'platform=iOS Simulator,name=iPhone 15' build
+
+# Run all tests (unit + UI)
+xcodebuild -scheme Cable -destination 'platform=iOS Simulator,name=iPhone 15' test
+
+# Run only unit tests
+xcodebuild -scheme Cable -destination 'platform=iOS Simulator,name=iPhone 15' -only-testing:CableTests test
+
+# Open in Xcode (preferred for UI iteration with previews)
+open Cable.xcodeproj
+```
+
+Requires Xcode 15+ and iOS 17 simulator. No external dependencies beyond the Xcode toolchain.
+
+## Architecture
+
+**SwiftUI + SwiftData app** for sizing low-voltage electrical conductors (boats, RVs, off-grid).
+
+### Data Model Hierarchy
+
+`ElectricalSystem` (top-level container) owns collections of:
+- `SavedLoad` — individual electrical loads with wire sizing parameters
+- `SavedBattery` — battery banks with chemistry-specific capacity rules
+- `SavedCharger` — charging equipment specs
+
+All are `@Model` classes persisted via SwiftData. The container is configured in `CableApp.swift` and injected into the SwiftUI environment.
+
+### Key Layers
+
+- **Calculation engine** (`Loads/ElectricalCalculations.swift`): Pure static functions for wire cross-section sizing, voltage drop, power loss, and fuse recommendations. Uses copper resistivity (0.017 Ω·mm²/m) with a 5% max voltage drop constraint. Supports both metric (mm²) and imperial (AWG) wire standards.
+- **CableCalculator** (`Loads/CableCalculator.swift`): ObservableObject wrapper that bridges the calculation engine to SwiftUI views.
+- **App-wide state**: `UnitSystemSettings` (metric/imperial, persisted to UserDefaults) and `StoreKitManager` (subscription status) are injected as `@EnvironmentObject`.
+
+### Navigation Flow
+
+`SystemsView` (root list) → `LoadsView` (per-system TabView with 4 tabs: Overview, Components, Batteries, Chargers) → individual editor modals for each entity type.
+
+### Feature Organization
+
+Each feature has its own directory under `Cable/`: `Loads/`, `Systems/`, `Batteries/`, `Chargers/`, `Overview/`, `Paywall/`. Models and views for each feature live together.
+
+## Code Style
+
+- 4-space indentation, trailing commas on multiline collections, 120-char soft line limit
+- `UpperCamelCase` for types, `lowerCamelCase` for methods/properties
+- Test naming: `testScenario_expectedResult`
+- Commit messages: short imperative subjects under 50 characters
+
+## Localization
+
+5 languages: English (base), German, Spanish, French, Dutch. UI strings use `String(localized:)`. Translation files are in `*.lproj/Localizable.strings` and `Localizable.stringsdict`.
+
+## StoreKit
+
+Subscription product IDs: `app.voltplan.cable.weekly`, `app.voltplan.cable.yearly`. Pro features are gated via `StoreKitManager.isPro`.

Cable.xcodeproj/project.pbxproj

@@ -30,6 +30,10 @@
 		};
 /* End PBXContainerItemProxy section */
 
+/* Begin PBXBuildFile section */
+		3EAA00032F0000000000AA03 /* Aptabase in Frameworks */ = {isa = PBXBuildFile; productRef = 3EAA00022F0000000000AA02 /* Aptabase */; };
+/* End PBXBuildFile section */
+
 /* Begin PBXFileReference section */
 		3E37F6552E93FB6F00836187 /* CableUITestsScreenshot.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = CableUITestsScreenshot.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
 		3E5C0BCC2E72C0FD00247EC8 /* Cable.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Cable.app; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -95,6 +99,7 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				3EAA00032F0000000000AA03 /* Aptabase in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -177,6 +182,9 @@
 				3E5C0BCE2E72C0FD00247EC8 /* Cable */,
 			);
 			name = Cable;
+			packageProductDependencies = (
+				3EAA00022F0000000000AA02 /* Aptabase */,
+			);
 			productName = Cable;
 			productReference = 3E5C0BCC2E72C0FD00247EC8 /* Cable.app */;
 			productType = "com.apple.product-type.application";
@@ -263,6 +271,9 @@
 			);
 			mainGroup = 3E5C0BC32E72C0FD00247EC8;
 			minimizedProjectReferenceProxies = 1;
+			packageReferences = (
+				3EAA00012F0000000000AA01 /* XCRemoteSwiftPackageReference "aptabase-swift" */,
+			);
 			preferredProjectObjectVersion = 77;
 			productRefGroup = 3E5C0BCD2E72C0FD00247EC8 /* Products */;
 			projectDirPath = "";
@@ -715,6 +726,25 @@
 			defaultConfigurationName = Release;
 		};
 /* End XCConfigurationList section */
+
+/* Begin XCRemoteSwiftPackageReference section */
+		3EAA00012F0000000000AA01 /* XCRemoteSwiftPackageReference "aptabase-swift" */ = {
+			isa = XCRemoteSwiftPackageReference;
+			repositoryURL = "https://github.com/aptabase/aptabase-swift.git";
+			requirement = {
+				kind = upToNextMajorVersion;
+				minimumVersion = 0.3.4;
+			};
+		};
+/* End XCRemoteSwiftPackageReference section */
+
+/* Begin XCSwiftPackageProductDependency section */
+		3EAA00022F0000000000AA02 /* Aptabase */ = {
+			isa = XCSwiftPackageProductDependency;
+			package = 3EAA00012F0000000000AA01 /* XCRemoteSwiftPackageReference "aptabase-swift" */;
+			productName = Aptabase;
+		};
+/* End XCSwiftPackageProductDependency section */
 	};
 	rootObject = 3E5C0BC42E72C0FD00247EC8 /* Project object */;
 }

Cable/AmazonAffiliate.swift

@@ -2,7 +2,7 @@ import Foundation
 
 enum AmazonAffiliate {
     private static let fallbackDomain = "www.amazon.com"
-    private static let fallbackTag: String? = nil
+    private static let fallbackTag: String? = "voltplan-20"
 
     private static let domainsByCountry: [String: String] = [
         "US": "www.amazon.com",
@@ -26,6 +26,10 @@ enum AmazonAffiliate {
     private static let tagsByCountry: [String: String] = [
         "US": "voltplan-20",
         "DE": "voltplan-21",
+        "AU": "voltplan-22",
+        "GB": "voltplan00-21",
+        "FR": "voltplan0f-21",
+        "CA": "voltplan01-20"
     ]
 
     private static let countryAliases: [String: String] = [

Cable/AppDelegate.swift

@@ -8,11 +8,15 @@
 
 import Foundation
 import UIKit
+import Aptabase
 
 class AppDelegate: NSObject, UIApplicationDelegate {
     func application(_: UIApplication, didFinishLaunchingWithOptions _: [UIApplication.LaunchOptionsKey: Any]? = nil) -> Bool {
-        AnalyticsTracker.configure()
-        NSLog("Launched")
+        Aptabase.shared.initialize(
+            appKey: "A-SH-4260269603",
+            with: InitOptions(host: "https://apta.yuzuhub.com")
+        )
+        AnalyticsTracker.log("App Launched")
         return true
     }
 }
@@ -21,6 +25,18 @@ enum AnalyticsTracker {
     static func configure() {}
 
     static func log(_ event: String, properties: [String: Any] = [:]) {
+        var converted: [String: Any] = [:]
+        for (key, value) in properties {
+            switch value {
+            case let s as String: converted[key] = s
+            case let i as Int: converted[key] = i
+            case let d as Double: converted[key] = d
+            case let f as Float: converted[key] = f
+            case let b as Bool: converted[key] = b
+            default: converted[key] = "\(value)"
+            }
+        }
+        Aptabase.shared.trackEvent(event, with: converted)
 #if DEBUG
         if properties.isEmpty {
             NSLog("Analytics: %@", event)

Cable/Base.lproj/Localizable.strings

@@ -83,6 +83,12 @@
 "bom.navigation.title" = "Bill of Materials";
 "bom.navigation.title.system" = "BOM – %@";
 "bom.size.unknown" = "Size TBD";
+"bom.search.battery" = "%dAh %dV %@ battery";
+"bom.search.cable.black" = "%@ black battery cable";
+"bom.search.cable.red" = "%@ red battery cable";
+"bom.search.device.fallback" = "DC device %.0fW %.0fV";
+"bom.search.fuse" = "inline fuse holder %dA";
+"bom.search.terminals" = "%@ cable shoes";
 "bom.terminals.detail" = "Ring or spade terminals sized for %@ wiring";
 "bom.empty.message" = "No components saved in this system yet.";
 "bom.export.pdf.button" = "Export PDF";

Cable/Batteries/BatteryEditorView.swift

@@ -5,12 +5,9 @@ struct BatteryEditorView: View {
     @State private var configuration: BatteryConfiguration
     @State private var temperatureEditingField: TemperatureEditingField?
     @State private var isAdvancedExpanded = false
-    @State private var showingProUpsell = false
     @State private var minimumTemperatureInput: String = ""
     @State private var maximumTemperatureInput: String = ""
     @State private var showingAppearanceEditor = false
-    @EnvironmentObject private var storeKitManager: StoreKitManager
-    @State private var hasActiveProSubscription = false
     let onSave: (BatteryConfiguration) -> Void
 
     private enum TemperatureEditingField {
@@ -529,15 +526,6 @@ struct BatteryEditorView: View {
                 )
             )
         }
-        .sheet(isPresented: $showingProUpsell) {
-            CableProPaywallView(isPresented: $showingProUpsell)
-        }
-        .task {
-            hasActiveProSubscription = storeKitManager.isProUnlocked
-        }
-        .onReceive(storeKitManager.$status) { _ in
-            hasActiveProSubscription = storeKitManager.isProUnlocked
-        }
         .alert(
             NSLocalizedString(
                 "battery.editor.alert.minimum_temperature.title",
@@ -851,9 +839,7 @@ struct BatteryEditorView: View {
     }
 
     private var advancedSection: some View {
-        let advancedEnabled = unitSettings.isProUnlocked || hasActiveProSubscription
-
-        return Section {
+        Section {
             Button {
                 withAnimation(.easeInOut(duration: 0.2)) {
                     isAdvancedExpanded.toggle()
@@ -870,7 +856,6 @@ struct BatteryEditorView: View {
                         .foregroundStyle(.secondary)
                 }
                 .padding(.vertical, 10)
-                .opacity(advancedEnabled ? 1 : 0.5)
                 .contentShape(Rectangle())
             }
             .buttonStyle(.plain)
@@ -878,14 +863,7 @@ struct BatteryEditorView: View {
             .listRowSeparator(.hidden)
 
             if isAdvancedExpanded {
-                if !advancedEnabled {
-                    upgradeToProCTA
-                        .listRowSeparator(.hidden)
-                        .listRowBackground(Color(.systemBackground))
-                }
                 advancedControls
-                    .opacity(advancedEnabled ? 1 : 0.35)
-                    .allowsHitTesting(advancedEnabled)
                     .transition(.opacity.combined(with: .move(edge: .top)))
                     .listRowSeparator(.hidden)
                     .listRowBackground(Color(.systemBackground))
@@ -1000,18 +978,6 @@ struct BatteryEditorView: View {
         .padding(.top, 6)
     }
 
-    private var upgradeToProCTA: some View {
-        Button {
-            showingProUpsell = true
-        } label: {
-            Text("Get Cable PRO")
-                .font(.callout.weight(.semibold))
-                .frame(maxWidth: .infinity)
-                .padding(.vertical, 6)
-        }
-        .buttonStyle(.borderedProminent)
-    }
-
     private var temperatureRangeRow: some View {
         VStack(alignment: .leading, spacing: 10) {
             Text(temperatureRangeTitle)

Cable/Batteries/SavedBattery.swift

@@ -16,6 +16,8 @@ class SavedBattery {
     var iconName: String = "battery.100"
     var colorName: String = "blue"
     var system: ElectricalSystem?
+    var affiliateURLString: String?
+    var affiliateCountryCode: String?
     var bomCompletedItemIDs: [String] = []
     var timestamp: Date
 
@@ -33,6 +35,8 @@ class SavedBattery {
         iconName: String = "battery.100",
         colorName: String = "blue",
         system: ElectricalSystem? = nil,
+        affiliateURLString: String? = nil,
+        affiliateCountryCode: String? = nil,
         bomCompletedItemIDs: [String] = [],
         timestamp: Date = Date()
     ) {
@@ -49,6 +53,8 @@ class SavedBattery {
         self.iconName = iconName
         self.colorName = colorName
         self.system = system
+        self.affiliateURLString = affiliateURLString
+        self.affiliateCountryCode = affiliateCountryCode
         self.bomCompletedItemIDs = bomCompletedItemIDs
         self.timestamp = timestamp
     }

Cable/CableApp.swift

@@ -11,8 +11,7 @@ import SwiftData
 @main
 struct CableApp: App {
     @UIApplicationDelegateAdaptor(AppDelegate.self) private var appDelegate
-    @StateObject private var unitSettings: UnitSystemSettings
-    @StateObject private var storeKitManager: StoreKitManager
+    @StateObject private var unitSettings = UnitSystemSettings()
 
     var sharedModelContainer: ModelContainer = {
         do {
@@ -33,9 +32,6 @@ struct CableApp: App {
     }()
 
     init() {
-        let unitSettings = UnitSystemSettings()
-        _unitSettings = StateObject(wrappedValue: unitSettings)
-        _storeKitManager = StateObject(wrappedValue: StoreKitManager(unitSettings: unitSettings))
 #if DEBUG
         UITestSampleData.handleLaunchArguments(container: sharedModelContainer)
 #endif
@@ -45,7 +41,6 @@ struct CableApp: App {
         WindowGroup {
             ContentView()
                 .environmentObject(unitSettings)
-                .environmentObject(storeKitManager)
         }
         .modelContainer(sharedModelContainer)
     }

Cable/Chargers/ChargerConfiguration.swift

@@ -15,7 +15,7 @@ struct ChargerConfiguration: Identifiable, Hashable {
     init(
         id: UUID = UUID(),
         name: String,
-        inputVoltage: Double = 230.0,
+        inputVoltage: Double = LocaleDefaults.mainsVoltage,
         outputVoltage: Double = 14.2,
         maxCurrentAmps: Double = 30.0,
         maxPowerWatts: Double = 0.0,

Cable/Chargers/SavedCharger.swift

@@ -22,7 +22,7 @@ final class SavedCharger {
     init(
         id: UUID = UUID(),
         name: String,
-        inputVoltage: Double = 230.0,
+        inputVoltage: Double = LocaleDefaults.mainsVoltage,
         outputVoltage: Double = 14.2,
         maxCurrentAmps: Double = 30.0,
         maxPowerWatts: Double = 0.0,

Cable/Loads/CalculatorView.swift

@@ -25,12 +25,9 @@ struct CalculatorView: View {
     @State private var dutyCycleInput: String = ""
     @State private var usageHoursInput: String = ""
     @State private var showingLoadEditor = false
-    @State private var showingProUpsell = false
     @State private var presentedAffiliateLink: AffiliateLinkInfo?
     @State private var completedItemIDs: Set<String>
     @State private var isAdvancedExpanded = false
-    @EnvironmentObject private var storeKitManager: StoreKitManager
-    @State private var hasActiveProSubscription = false
     
     let savedLoad: SavedLoad?
     
@@ -80,12 +77,6 @@ struct CalculatorView: View {
                 navigationWrapped(mainLayout)
             )
         )
-        .task {
-            hasActiveProSubscription = storeKitManager.isProUnlocked
-        }
-        .onReceive(storeKitManager.$status) { _ in
-            hasActiveProSubscription = storeKitManager.isProUnlocked
-        }
     }
 
     private func attachAlerts<V: View>(_ view: V) -> some View {
@@ -355,9 +346,6 @@ struct CalculatorView: View {
             .sheet(isPresented: $showingLibrary, content: librarySheet)
             .sheet(isPresented: $showingLoadEditor, content: loadEditorSheet)
             .sheet(item: $presentedAffiliateLink, content: billOfMaterialsSheet(info:))
-            .sheet(isPresented: $showingProUpsell) {
-                CableProPaywallView(isPresented: $showingProUpsell)
-            }
             .onAppear {
                 if let savedLoad = savedLoad {
                     loadConfiguration(from: savedLoad)
@@ -478,23 +466,23 @@ struct CalculatorView: View {
         savedLoad?.remoteIconURLString
     }
 
-    private var affiliateLinkInfo: AffiliateLinkInfo? {
-        guard let savedLoad else { return nil }
-
+    private var affiliateLinkInfo: AffiliateLinkInfo {
         let affiliateURL: URL?
-        if let urlString = savedLoad.affiliateURLString,
+        if let urlString = savedLoad?.affiliateURLString,
            let parsedURL = URL(string: urlString) {
             affiliateURL = parsedURL
         } else {
             affiliateURL = nil
         }
 
-        let rawCountryCode = savedLoad.affiliateCountryCode ?? Locale.current.region?.identifier
+        let rawCountryCode = savedLoad?.affiliateCountryCode ?? Locale.current.region?.identifier
         let countryCode = rawCountryCode?.uppercased()
         let regionName = countryCode.flatMap { Locale.current.localizedString(forRegionCode: $0) ?? $0 }
 
         let buttonTitle = String(localized: "affiliate.button.review_parts", comment: "Button title to review a bill of materials before shopping")
-        let identifier = "bom-\(savedLoad.name)-\(savedLoad.timestamp.timeIntervalSince1970)"
+        let name = savedLoad?.name ?? calculator.loadName
+        let timestamp = savedLoad?.timestamp ?? Date(timeIntervalSince1970: 0)
+        let identifier = "bom-\(name)-\(timestamp.timeIntervalSince1970)"
 
         return AffiliateLinkInfo(
             id: identifier,
@@ -753,12 +741,10 @@ struct CalculatorView: View {
         List {
             slidersSection
             advancedSettingsSection
-            if let info = affiliateLinkInfo {
-                affiliateLinkSection(info: info)
-                    .listRowBackground(Color.clear)
-                    .listRowSeparator(.hidden)
-                    .listRowInsets(EdgeInsets(top: 12, leading: 18, bottom: 12, trailing: 18))
-            }
+            affiliateLinkSection(info: affiliateLinkInfo)
+                .listRowBackground(Color.clear)
+                .listRowSeparator(.hidden)
+                .listRowInsets(EdgeInsets(top: 12, leading: 18, bottom: 12, trailing: 18))
         }
         .listStyle(.plain)
         .scrollIndicators(.hidden)
@@ -770,6 +756,10 @@ struct CalculatorView: View {
     private func affiliateLinkSection(info: AffiliateLinkInfo) -> some View {
         VStack(alignment: .leading, spacing: 12) {
             Button {
+                AnalyticsTracker.log("Review Parts Tapped", properties: [
+                    "load": info.id,
+                    "has_affiliate": info.affiliateURL != nil,
+                ])
                 presentedAffiliateLink = info
             } label: {
                 Label(info.buttonTitle, systemImage: "cart")
@@ -846,12 +836,17 @@ struct CalculatorView: View {
             cableGaugeQuery = String(format: "%.1f mm2", crossSectionValue)
         }
 
-        let redCableQuery = "\(cableGaugeQuery) red battery cable"
-        let blackCableQuery = "\(cableGaugeQuery) black battery cable"
-        let fuseQuery = "inline fuse holder \(fuseRating)A"
-        let terminalQuery = "\(cableGaugeQuery) cable shoes"
+        let redCableSearchFormat = NSLocalizedString("bom.search.cable.red", comment: "Amazon search query for red battery cable")
+        let redCableQuery = String(format: redCableSearchFormat, cableGaugeQuery)
+        let blackCableSearchFormat = NSLocalizedString("bom.search.cable.black", comment: "Amazon search query for black battery cable")
+        let blackCableQuery = String(format: blackCableSearchFormat, cableGaugeQuery)
+        let fuseSearchFormat = NSLocalizedString("bom.search.fuse", comment: "Amazon search query for inline fuse holder")
+        let fuseQuery = String(format: fuseSearchFormat, fuseRating)
+        let terminalSearchFormat = NSLocalizedString("bom.search.terminals", comment: "Amazon search query for cable shoes")
+        let terminalQuery = String(format: terminalSearchFormat, cableGaugeQuery)
+        let deviceFallbackFormat = NSLocalizedString("bom.search.device.fallback", comment: "Amazon search query fallback for a DC device")
         let deviceQueryBase = calculator.loadName.isEmpty
-            ? String(format: "DC device %.0fW %.0fV", calculator.calculatedPower, calculator.voltage)
+            ? String(format: deviceFallbackFormat, calculator.calculatedPower, calculator.voltage)
             : calculator.loadName
 
         var items: [BOMItem] = []
@@ -993,10 +988,6 @@ struct CalculatorView: View {
         )
     }
 
-    private var advancedFeaturesEnabled: Bool {
-        unitSettings.isProUnlocked || hasActiveProSubscription
-    }
-
     private var slidersSection: some View {
         Section {
             voltageSlider
@@ -1012,9 +1003,7 @@ struct CalculatorView: View {
     }
 
     private var advancedSettingsSection: some View {
-        let advancedEnabled = advancedFeaturesEnabled
-
-        return Section {
+        Section {
             Button {
                 withAnimation(.easeInOut(duration: 0.2)) {
                     isAdvancedExpanded.toggle()
@@ -1031,7 +1020,6 @@ struct CalculatorView: View {
                         .foregroundStyle(.secondary)
                 }
                 .padding(.vertical, 10)
-                .opacity(advancedEnabled ? 1 : 0.5)
                 .contentShape(Rectangle())
             }
             .buttonStyle(.plain)
@@ -1039,33 +1027,22 @@ struct CalculatorView: View {
             .listRowSeparator(.hidden)
 
             if isAdvancedExpanded {
-                if !advancedEnabled {
-                    upgradeToProCTA
-                        .listRowSeparator(.hidden)
-                        .listRowBackground(Color(.systemBackground))
-                }
                 VStack(alignment: .leading, spacing: 8) {
                     dutyCycleSlider
                         .listRowSeparator(.hidden)
                         .listRowBackground(Color(.systemBackground))
-                        .opacity(advancedEnabled ? 1 : 0.35)
-                        .allowsHitTesting(advancedEnabled)
                     Text(dutyCycleHelperText)
                         .font(.caption)
                         .foregroundStyle(.secondary)
-                        .opacity(advancedEnabled ? 1 : 0.35)
                 }
 
                 VStack(alignment: .leading, spacing: 8) {
                     usageHoursSlider
                         .listRowSeparator(.hidden)
                         .listRowBackground(Color(.systemBackground))
-                        .opacity(advancedEnabled ? 1 : 0.35)
-                        .allowsHitTesting(advancedEnabled)
                     Text(usageHoursHelperText)
                         .font(.caption)
                         .foregroundStyle(.secondary)
-                        .opacity(advancedEnabled ? 1 : 0.35)
                 }
             }
         }
@@ -1074,18 +1051,6 @@ struct CalculatorView: View {
         .animation(.easeInOut(duration: 0.2), value: isAdvancedExpanded)
     }
 
-    private var upgradeToProCTA: some View {
-        Button {
-            showingProUpsell = true
-        } label: {
-            Text("Get Cable PRO")
-                .font(.callout.weight(.semibold))
-                .frame(maxWidth: .infinity)
-                .padding(.vertical, 6)
-        }
-        .buttonStyle(.borderedProminent)
-    }
-
     private var voltageSliderRange: ClosedRange<Double> {
         let upperBound = max(48, calculator.voltage)
         return 0...upperBound
@@ -1536,6 +1501,14 @@ private struct BillOfMaterialsView: View {
                                 return
                             }
                             if let destinationURL {
+                                let isAffiliate: Bool
+                                if case .affiliate = item.destination { isAffiliate = true } else { isAffiliate = false }
+                                AnalyticsTracker.log("BOM Item Tapped", properties: [
+                                    "item": item.title,
+                                    "is_affiliate": isAffiliate,
+                                    "domain": destinationURL.host ?? "unknown",
+                                    "load": info.id,
+                                ])
                                 openURL(destinationURL)
                             }
                             completedItemIDs.insert(item.id)

Cable/Loads/LoadsView.swift

@@ -283,6 +283,10 @@ struct LoadsView: View {
             }
         }
         .onChange(of: selectedComponentTab) { _, newValue in
+            AnalyticsTracker.log("Tab Changed", properties: [
+                "tab": "\(newValue)",
+                "system": system.name,
+            ])
             if newValue == .chargers || newValue == .overview {
                 editMode = .inactive
             }

Cable/Paywall/CableProPaywallView.swift

@@ -1,546 +0,0 @@
-import SwiftUI
-import StoreKit
-
-@MainActor
-final class CableProPaywallViewModel: ObservableObject {
-    enum LoadingState: Equatable {
-        case idle
-        case loading
-        case loaded
-        case failed(String)
-    }
-
-    @Published private(set) var products: [Product] = []
-    @Published private(set) var state: LoadingState = .idle
-    @Published private(set) var purchasingProductID: String?
-    @Published private(set) var isRestoring = false
-    @Published private(set) var purchasedProductIDs: Set<String> = []
-    @Published var alert: PaywallAlert?
-
-    private let productIdentifiers: [String]
-
-    init(productIdentifiers: [String]) {
-        self.productIdentifiers = productIdentifiers
-        Task {
-            await updateCurrentEntitlements()
-        }
-    }
-
-    func loadProducts(force: Bool = false) async {
-        if state == .loading { return }
-        if !force, case .loaded = state { return }
-
-        guard !productIdentifiers.isEmpty else {
-            products = []
-            state = .loaded
-            return
-        }
-
-        state = .loading
-        do {
-            let fetched = try await Product.products(for: productIdentifiers)
-            products = fetched.sorted { productSortKey(lhs: $0, rhs: $1) }
-            state = .loaded
-            await updateCurrentEntitlements()
-        } catch {
-            state = .failed(error.localizedDescription)
-        }
-    }
-
-    private func productSortKey(lhs: Product, rhs: Product) -> Bool {
-        sortIndex(for: lhs) < sortIndex(for: rhs)
-    }
-
-    private func sortIndex(for product: Product) -> Int {
-        guard let period = product.subscription?.subscriptionPeriod else { return Int.max }
-        switch period.unit {
-        case .day: return 0
-        case .week: return 1
-        case .month: return 2
-        case .year: return 3
-        @unknown default: return 10
-        }
-    }
-
-    func purchase(_ product: Product) async {
-        guard purchasingProductID == nil else { return }
-
-        purchasingProductID = product.id
-        defer { purchasingProductID = nil }
-
-        do {
-            let result = try await product.purchase()
-            switch result {
-            case .success(let verification):
-                let transaction = try verify(verification)
-                purchasedProductIDs.insert(transaction.productID)
-                alert = PaywallAlert(kind: .success, message: localizedString("cable.pro.alert.success.body", defaultValue: "Thanks for supporting Cable PRO!"))
-                await transaction.finish()
-                await updateCurrentEntitlements()
-            case .userCancelled:
-                break
-            case .pending:
-                alert = PaywallAlert(kind: .pending, message: localizedString("cable.pro.alert.pending.body", defaultValue: "Your purchase is awaiting approval."))
-            @unknown default:
-                alert = PaywallAlert(kind: .error, message: localizedString("cable.pro.alert.error.generic", defaultValue: "Something went wrong. Please try again."))
-            }
-        } catch {
-            alert = PaywallAlert(kind: .error, message: error.localizedDescription)
-        }
-    }
-
-    func restorePurchases() async {
-        guard !isRestoring else { return }
-        isRestoring = true
-        defer { isRestoring = false }
-
-        do {
-            try await AppStore.sync()
-            await updateCurrentEntitlements()
-            alert = PaywallAlert(kind: .restored, message: localizedString("cable.pro.alert.restored.body", defaultValue: "Your purchases are available again."))
-        } catch {
-            alert = PaywallAlert(kind: .error, message: error.localizedDescription)
-        }
-    }
-
-    private func verify<T>(_ result: VerificationResult<T>) throws -> T {
-        switch result {
-        case .verified(let signed):
-            return signed
-        case .unverified(_, let error):
-            throw error
-        }
-    }
-
-    private func updateCurrentEntitlements() async {
-        var unlocked: Set<String> = []
-
-        for await result in Transaction.currentEntitlements {
-            switch result {
-            case .verified(let transaction):
-                if productIdentifiers.contains(transaction.productID) {
-                    unlocked.insert(transaction.productID)
-                }
-            case .unverified:
-                continue
-            }
-        }
-
-        purchasedProductIDs = unlocked
-    }
-}
-
-struct CableProPaywallView: View {
-    @Environment(\.dismiss) private var dismiss
-    @Binding var isPresented: Bool
-    @EnvironmentObject private var unitSettings: UnitSystemSettings
-    @EnvironmentObject private var storeKitManager: StoreKitManager
-
-    @StateObject private var viewModel: CableProPaywallViewModel
-    @State private var alertInfo: PaywallAlert?
-
-    private static let defaultProductIds = StoreKitManager.subscriptionProductIDs
-
-    init(isPresented: Binding<Bool>, productIdentifiers: [String] = CableProPaywallView.defaultProductIds) {
-        _isPresented = isPresented
-        _viewModel = StateObject(wrappedValue: CableProPaywallViewModel(productIdentifiers: productIdentifiers))
-    }
-
-    var body: some View {
-        NavigationStack {
-            VStack(spacing: 24) {
-                header
-                featureList
-                plansSection
-                footer
-            }
-            .padding(.horizontal, 20)
-            .padding(.top, 28)
-            .padding(.bottom, 16)
-            .navigationTitle("Cable PRO")
-            .navigationBarTitleDisplayMode(.inline)
-            .toolbar {
-                ToolbarItem(placement: .cancellationAction) {
-                    Button("Close") {
-                        dismiss()
-                    }
-                }
-            }
-            .task {
-                await viewModel.loadProducts(force: true)
-                await storeKitManager.refreshEntitlements()
-            }
-            .refreshable {
-                await viewModel.loadProducts(force: true)
-                await storeKitManager.refreshEntitlements()
-            }
-        }
-        .onChange(of: viewModel.alert) { newValue in
-            alertInfo = newValue
-        }
-        .alert(item: $alertInfo) { alert in
-            Alert(
-                title: Text(alert.title),
-                message: Text(alert.messageText),
-                dismissButton: .default(Text("OK")) {
-                    viewModel.alert = nil
-                    alertInfo = nil
-                }
-            )
-        }
-        .onChange(of: viewModel.purchasedProductIDs) { newValue in
-            Task { await storeKitManager.refreshEntitlements() }
-        }
-    }
-
-    private var header: some View {
-        VStack(alignment: .leading, spacing: 12) {
-            Text(localizedString("cable.pro.paywall.title", defaultValue: "Unlock Cable PRO"))
-                .font(.largeTitle.bold())
-            Text(localizedString("cable.pro.paywall.subtitle", defaultValue: "Cable PRO enables more configuration options for loads, batteries and chargers."))
-                .font(.body)
-                .foregroundStyle(.secondary)
-                .fixedSize(horizontal: false, vertical: true)
-        }
-        .frame(maxWidth: .infinity, alignment: .leading)
-    }
-
-    private var featureList: some View {
-        VStack(alignment: .leading, spacing: 10) {
-            paywallFeature(text: localizedString("cable.pro.feature.dutyCycle", defaultValue: "Duty-cycle aware cable calculators"), icon: "bolt.fill")
-            paywallFeature(text: localizedString("cable.pro.feature.batteryCapacity", defaultValue: "Configure usable battery capacity"), icon: "list.clipboard")
-            paywallFeature(text: localizedString("cable.pro.feature.usageBased", defaultValue: "Usage based calculations"), icon: "sparkles")
-        }
-        .frame(maxWidth: .infinity, alignment: .leading)
-    }
-
-    private func paywallFeature(text: String, icon: String) -> some View {
-        HStack(spacing: 12) {
-            Image(systemName: icon)
-                .font(.headline)
-                .foregroundStyle(Color.accentColor)
-                .frame(width: 28, height: 28)
-                .background(
-                    Circle()
-                        .fill(Color.accentColor.opacity(0.12))
-                )
-            Text(text)
-                .font(.callout)
-                .foregroundStyle(.primary)
-        }
-        .padding(.vertical, 4)
-    }
-
-    @ViewBuilder
-    private var plansSection: some View {
-        switch viewModel.state {
-        case .idle, .loading:
-            RoundedRectangle(cornerRadius: 16)
-                .fill(Color(.secondarySystemBackground))
-                .frame(height: 140)
-                .overlay(ProgressView())
-                .frame(maxWidth: .infinity)
-        case .failed(let message):
-            VStack(spacing: 12) {
-                Text("We couldn't load Cable PRO at the moment.")
-                    .font(.headline)
-                Text(message)
-                    .font(.caption)
-                    .foregroundStyle(.secondary)
-                Button(action: { Task { await viewModel.loadProducts(force: true) } }) {
-                    Text("Try Again")
-                        .font(.callout.weight(.semibold))
-                        .frame(maxWidth: .infinity)
-                        .padding(.vertical, 12)
-                }
-                .buttonStyle(.borderedProminent)
-            }
-            .padding()
-            
-        case .loaded:
-            if viewModel.products.isEmpty {
-                VStack(spacing: 12) {
-                    Text("No plans are currently available.")
-                        .font(.headline)
-                    Text("Check back soon—Cable PRO launches in your region shortly.")
-                        .font(.caption)
-                        .foregroundStyle(.secondary)
-                }
-                .padding()
-                .background(
-                    RoundedRectangle(cornerRadius: 16)
-                        .fill(Color(.secondarySystemBackground))
-                )
-            } else {
-                VStack(spacing: 12) {
-                    let hasActiveSubscription = !viewModel.purchasedProductIDs.isEmpty
-
-                    ForEach(viewModel.products) { product in
-                        PlanCard(
-                            product: product,
-                            isProcessing: viewModel.purchasingProductID == product.id,
-                            isPurchased: viewModel.purchasedProductIDs.contains(product.id),
-                            isDisabled: hasActiveSubscription && !viewModel.purchasedProductIDs.contains(product.id)
-                        ) {
-                            Task {
-                                await viewModel.purchase(product)
-                            }
-                        }
-                    }
-                }
-            }
-        }
-    }
-
-    private var footer: some View {
-        VStack(spacing: 12) {
-            Button {
-                Task {
-                    await viewModel.restorePurchases()
-                }
-            } label: {
-                if viewModel.isRestoring {
-                    ProgressView()
-                        .frame(maxWidth: .infinity)
-                } else {
-                    Text(localizedString("cable.pro.restore.button", defaultValue: "Restore Purchases"))
-                        .font(.footnote.weight(.semibold))
-                }
-            }
-            .buttonStyle(.borderless)
-            .padding(.top, 8)
-            .disabled(viewModel.isRestoring)
-
-            HStack(spacing: 16) {
-                if let termsURL = localizedURL(forKey: "cable.pro.terms.url") {
-                    Link(localizedString("cable.pro.terms.label", defaultValue: "Terms"), destination: termsURL)
-                }
-                if let privacyURL = localizedURL(forKey: "cable.pro.privacy.url") {
-                    Link(localizedString("cable.pro.privacy.label", defaultValue: "Privacy"), destination: privacyURL)
-                }
-            }
-            .font(.footnote)
-            .foregroundStyle(.secondary)
-        }
-        .frame(maxWidth: .infinity)
-    }
-
-    private func localizedURL(forKey key: String) -> URL? {
-        let raw = localizedString(key, defaultValue: "")
-        guard let url = URL(string: raw), !raw.isEmpty else { return nil }
-        return url
-    }
-}
-
-private func localizedString(_ key: String, defaultValue: String) -> String {
-    NSLocalizedString(key, tableName: nil, bundle: .main, value: defaultValue, comment: "")
-}
-
-private func localizedDurationString(for period: Product.SubscriptionPeriod) -> String {
-    let locale = Locale.autoupdatingCurrent
-    let number = localizedNumber(period.value, locale: locale)
-
-    let unitBase: String
-    switch period.unit {
-    case .day: unitBase = "day"
-    case .week: unitBase = "week"
-    case .month: unitBase = "month"
-    case .year: unitBase = "year"
-    @unknown default: unitBase = "day"
-    }
-
-    if period.value == 1 {
-        let key = "cable.pro.duration.\(unitBase).singular"
-        return localizedString(key, defaultValue: singularDurationFallback(for: unitBase))
-    } else {
-        let key = "cable.pro.duration.\(unitBase).plural"
-        let template = localizedString(key, defaultValue: pluralDurationFallback(for: unitBase))
-        return String(format: template, number)
-    }
-}
-
-private func localizedNumber(_ value: Int, locale: Locale) -> String {
-    let formatter = NumberFormatter()
-    formatter.locale = locale
-    formatter.numberStyle = .decimal
-    return formatter.string(from: NSNumber(value: value)) ?? String(value)
-}
-
-private func singularDurationFallback(for unit: String) -> String {
-    switch unit {
-    case "day": return "every day"
-    case "week": return "every week"
-    case "month": return "every month"
-    case "year": return "every year"
-    default: return "every day"
-    }
-}
-
-private func pluralDurationFallback(for unit: String) -> String {
-    switch unit {
-    case "day": return "every %@ days"
-    case "week": return "every %@ weeks"
-    case "month": return "every %@ months"
-    case "year": return "every %@ years"
-    default: return "every %@ days"
-    }
-}
-
-private func trialDurationString(for period: Product.SubscriptionPeriod) -> String {
-    let locale = Locale.autoupdatingCurrent
-    let number = localizedNumber(period.value, locale: locale)
-
-    let unitBase: String
-    switch period.unit {
-    case .day: unitBase = "day"
-    case .week: unitBase = "week"
-    case .month: unitBase = "month"
-    case .year: unitBase = "year"
-    @unknown default: unitBase = "day"
-    }
-
-    let key = "cable.pro.trial.duration.\(unitBase).\(period.value == 1 ? "singular" : "plural")"
-
-    let fallbackTemplate: String
-    switch unitBase {
-    case "day": fallbackTemplate = "%@-day"
-    case "week": fallbackTemplate = "%@-week"
-    case "month": fallbackTemplate = "%@-month"
-    case "year": fallbackTemplate = "%@-year"
-    default: fallbackTemplate = "%@-day"
-    }
-
-    let template = localizedString(key, defaultValue: fallbackTemplate)
-    if template.contains("%@") {
-        return String(format: template, number)
-    } else {
-        return template
-    }
-}
-
-private struct PlanCard: View {
-    let product: Product
-    let isProcessing: Bool
-    let isPurchased: Bool
-    let isDisabled: Bool
-    let action: () -> Void
-
-    var body: some View {
-        VStack(alignment: .leading, spacing: 12) {
-            HStack(alignment: .firstTextBaseline) {
-                Text(product.displayName)
-                    .font(.headline)
-                Spacer()
-                Text(product.displayPrice)
-                    .font(.headline)
-            }
-
-            if let info = product.subscription {
-                VStack(alignment: .leading, spacing: 6) {
-                    if let trial = trialDescription(for: info) {
-                        Text(trial)
-                            .font(.caption.weight(.semibold))
-                            .padding(.vertical, 4)
-                            .padding(.horizontal, 8)
-                            .background(
-                                Capsule()
-                                    .fill(Color.accentColor.opacity(0.15))
-                            )
-                            .foregroundStyle(Color.accentColor)
-                    }
-
-                    Text(subscriptionDescription(for: info))
-                        .font(.caption)
-                        .foregroundStyle(.secondary)
-                }
-            }
-
-            Button(action: action) {
-                Group {
-                    if isProcessing {
-                        ProgressView()
-                    } else if isPurchased {
-                        Label(localizedString("cable.pro.button.unlocked", defaultValue: "Unlocked"), systemImage: "checkmark.circle.fill")
-                            .labelStyle(.titleAndIcon)
-                    } else {
-                        let titleKey = product.subscription?.introductoryOffer != nil ? "cable.pro.button.freeTrial" : "cable.pro.button.unlock"
-                        Text(localizedString(titleKey, defaultValue: product.subscription?.introductoryOffer != nil ? "Start Free Trial" : "Unlock Now"))
-                    }
-                }
-                .font(.callout.weight(.semibold))
-                .frame(maxWidth: .infinity)
-                .padding(.vertical, 6)
-            }
-            .buttonStyle(.borderedProminent)
-            .disabled(isProcessing || isPurchased || isDisabled)
-            .opacity((isPurchased || isDisabled) ? 0.6 : 1)
-        }
-        .padding()
-        .background(
-            RoundedRectangle(cornerRadius: 16)
-                .fill(Color(.secondarySystemBackground))
-        )
-        .overlay(
-            RoundedRectangle(cornerRadius: 16)
-                .stroke(isPurchased ? Color.accentColor : Color.clear, lineWidth: isPurchased ? 2 : 0)
-        )
-    }
-
-    private func trialDescription(for info: Product.SubscriptionInfo) -> String? {
-        guard
-            let offer = info.introductoryOffer,
-            offer.paymentMode == .freeTrial
-        else { return nil }
-
-        let duration = trialDurationString(for: offer.period)
-        let template = localizedString("cable.pro.trial.badge", defaultValue: "Includes a %@ free trial")
-        return String(format: template, duration)
-    }
-
-    private func subscriptionDescription(for info: Product.SubscriptionInfo) -> String {
-        let quantity = localizedDurationString(for: info.subscriptionPeriod)
-
-        let templateKey: String
-        if let offer = info.introductoryOffer,
-           offer.paymentMode == .freeTrial {
-            templateKey = "cable.pro.subscription.trialThenRenews"
-        } else {
-            templateKey = "cable.pro.subscription.renews"
-        }
-        let template = localizedString(templateKey, defaultValue: templateKey == "cable.pro.subscription.trialThenRenews" ? "Free trial, then renews every %@." : "Renews every %@.")
-        return String(format: template, quantity)
-    }
-}
-
-struct PaywallAlert: Identifiable, Equatable {
-    enum Kind { case success, pending, restored, error }
-
-    let id = UUID()
-    let kind: Kind
-    let message: String
-
-    var title: String {
-        switch kind {
-        case .success:
-            return localizedString("cable.pro.alert.success.title", defaultValue: "Cable PRO Unlocked")
-        case .pending:
-            return localizedString("cable.pro.alert.pending.title", defaultValue: "Purchase Pending")
-        case .restored:
-            return localizedString("cable.pro.alert.restored.title", defaultValue: "Purchases Restored")
-        case .error:
-            return localizedString("cable.pro.alert.error.title", defaultValue: "Purchase Failed")
-        }
-    }
-
-    var messageText: String {
-        message
-    }
-}
-
-#Preview {
-    let unitSettings = UnitSystemSettings()
-    let manager = StoreKitManager(unitSettings: unitSettings)
-    return CableProPaywallView(isPresented: .constant(true))
-        .environmentObject(unitSettings)
-        .environmentObject(manager)
-}

Cable/SettingsView.swift

@@ -10,12 +10,9 @@ import SwiftUI
 
 struct SettingsView: View {
     @EnvironmentObject var unitSettings: UnitSystemSettings
-    @EnvironmentObject private var storeKitManager: StoreKitManager
     @Environment(\.dismiss) private var dismiss
     @Environment(\.openURL) private var openURL
 
-    @State private var showingProPaywall = false
-    
     var body: some View {
         NavigationStack {
             Form {
@@ -27,9 +24,6 @@ struct SettingsView: View {
                     }
                     .pickerStyle(.segmented)
                 }
-                Section("Cable PRO") {
-                    proSectionContent
-                }
                 Section {
                     VStack(alignment: .leading, spacing: 12) {
                         HStack(spacing: 8) {
@@ -72,141 +66,11 @@ struct SettingsView: View {
                 }
             }
         }
-        .sheet(isPresented: $showingProPaywall) {
-            CableProPaywallView(isPresented: $showingProPaywall)
-        }
-        .onChange(of: showingProPaywall) { isPresented in
-            if !isPresented {
-                Task { await storeKitManager.refreshEntitlements() }
-            }
-        }
-        .onAppear {
-            Task { await storeKitManager.refreshEntitlements() }
-        }
-    }
-    
-    @ViewBuilder
-    private var proSectionContent: some View {
-        if storeKitManager.isRefreshing && storeKitManager.status == nil {
-            HStack {
-                Spacer()
-                ProgressView()
-                Spacer()
-            }
-        } else if let status = storeKitManager.status {
-            VStack(alignment: .leading, spacing: 8) {
-                Label(status.displayName, systemImage: "checkmark.seal.fill")
-                    .font(.headline)
-                
-                if let renewalDate = status.renewalDate {
-                    Text(renewalText(for: renewalDate))
-                        .font(.footnote)
-                        .foregroundStyle(.secondary)
-                }
-                
-                if let trialText = trialMessage(for: status) {
-                    Text(trialText)
-                        .font(.footnote)
-                        .foregroundStyle(.secondary)
-                }
-
-                if status.isInGracePeriod {
-                    Text(localizedString("settings.pro.grace_period", defaultValue: "We're retrying your last payment; access remains during the grace period."))
-                        .font(.footnote)
-                        .foregroundStyle(.secondary)
-                }
-
-                if let isAutoRenewEnabled = status.isAutoRenewEnabled, !isAutoRenewEnabled {
-                    Text(localizedString("settings.pro.autorenew.off", defaultValue: "Auto-renew is off—consider renewing to keep Cable PRO."))
-                        .font(.footnote)
-                        .foregroundStyle(.secondary)
-                }
-                
-                Text(localizedString("settings.pro.instructions", defaultValue: "Manage or cancel your subscription in the App Store."))
-                    .font(.footnote)
-                    .foregroundStyle(.secondary)
-                    .padding(.top, 4)
-                
-                Button {
-                    openManageSubscriptions()
-                } label: {
-                    Text(localizedString("settings.pro.manage.button", defaultValue: "Manage Subscription"))
-                        .font(.callout.weight(.semibold))
-                        .frame(maxWidth: .infinity)
-                        .padding(6)
-                }
-                .buttonStyle(.borderedProminent)
-            }
-            .padding(.vertical, 4)
-        } else {
-            VStack(alignment: .leading, spacing: 10) {
-                Text(localizedString("settings.pro.cta.description", defaultValue: "Cable PRO keeps advanced calculations and early tools available."))
-                    .font(.body)
-                    .foregroundStyle(.secondary)
-
-                Button {
-                    showingProPaywall = true
-                } label: {
-                    Text(localizedString("settings.pro.cta.button", defaultValue: "Get Cable PRO"))
-                        .font(.callout.weight(.semibold))
-                        .frame(maxWidth: .infinity)
-                        .padding(6)
-                }
-                .buttonStyle(.borderedProminent)
-            }
-        }
-    }
-    
-    private func renewalText(for date: Date) -> String {
-        let formatter = DateFormatter()
-        formatter.dateStyle = .medium
-        formatter.timeStyle = .none
-        formatter.locale = Locale.autoupdatingCurrent
-        let dateString = formatter.string(from: date)
-        let template = localizedString("settings.pro.renewal.date", defaultValue: "Renews on %@.")
-        return String(format: template, dateString)
-    }
-    
-    private func trialMessage(for status: StoreKitManager.SubscriptionStatus) -> String? {
-        guard status.isInTrial, let endDate = status.trialEndDate else { return nil }
-        let days = max(Calendar.autoupdatingCurrent.dateComponents([.day], from: Date(), to: endDate).day ?? 0, 0)
-        if days > 0 {
-            let dayText = localizedDayCount(days)
-            let template = localizedString("settings.pro.trial.remaining", defaultValue: "%@ remaining in free trial.")
-            return String(format: template, dayText)
-        } else {
-            return localizedString("settings.pro.trial.today", defaultValue: "Free trial renews today.")
-        }
-    }
-    
-    private func localizedDayCount(_ days: Int) -> String {
-        let number = localizedNumber(days)
-        let key = days == 1 ? "settings.pro.day.one" : "settings.pro.day.other"
-        let template = localizedString(key, defaultValue: days == 1 ? "%@ day" : "%@ days")
-        return String(format: template, number)
-    }
-    
-    private func openManageSubscriptions() {
-        guard let url = URL(string: localizedString("settings.pro.manage.url", defaultValue: "https://apps.apple.com/account/subscriptions")) else { return }
-        openURL(url)
-    }
-    
-    private func localizedNumber(_ value: Int) -> String {
-        let formatter = NumberFormatter()
-        formatter.locale = Locale.autoupdatingCurrent
-        formatter.numberStyle = .decimal
-        return formatter.string(from: NSNumber(value: value)) ?? String(value)
-    }
-    
-    private func localizedString(_ key: String, defaultValue: String) -> String {
-        NSLocalizedString(key, tableName: nil, bundle: .main, value: defaultValue, comment: "")
     }
 }
 
 #Preview("Settings (Default)") {
     let settings = UnitSystemSettings()
-    let manager = StoreKitManager(unitSettings: settings)
     return SettingsView()
         .environmentObject(settings)
-        .environmentObject(manager)
 }

Cable/StoreKitManager.swift

@@ -1,221 +0,0 @@
-import Foundation
-import StoreKit
-
-@MainActor
-final class StoreKitManager: ObservableObject {
-    struct SubscriptionStatus: Equatable {
-        let productId: String
-        let displayName: String
-        let renewalDate: Date?
-        let isInTrial: Bool
-        let trialEndDate: Date?
-        let isInGracePeriod: Bool
-        let isAutoRenewEnabled: Bool?
-    }
-
-    nonisolated static let subscriptionProductIDs: [String] = [
-        "app.voltplan.cable.weekly",
-        "app.voltplan.cable.yearly"
-    ]
-
-    @Published private(set) var status: SubscriptionStatus?
-    @Published private(set) var isRefreshing = false
-
-    var isProUnlocked: Bool {
-        status != nil
-    }
-
-    private let productIDs: Set<String>
-    private weak var unitSettings: UnitSystemSettings?
-    private var updatesTask: Task<Void, Never>?
-    private var productCache: [String: Product] = [:]
-
-    init(
-        productIDs: [String] = StoreKitManager.subscriptionProductIDs,
-        unitSettings: UnitSystemSettings? = nil
-    ) {
-        self.productIDs = Set(productIDs)
-        self.unitSettings = unitSettings
-
-        updatesTask = Task { [weak self] in
-            await self?.observeTransactionUpdates()
-        }
-
-        Task { [weak self] in
-            await self?.finishUnfinishedTransactions()
-            await self?.refreshEntitlements()
-        }
-    }
-
-    deinit {
-        updatesTask?.cancel()
-    }
-
-    func attachUnitSettings(_ settings: UnitSystemSettings) {
-        unitSettings = settings
-        Task { [weak self] in
-            await self?.refreshEntitlements()
-        }
-    }
-
-    func refreshEntitlements() async {
-        guard !isRefreshing else { return }
-
-        isRefreshing = true
-        defer { isRefreshing = false }
-
-        let resolvedStatus = await loadCurrentStatus()
-        status = resolvedStatus
-        unitSettings?.isProUnlocked = resolvedStatus != nil
-    }
-
-    private func loadCurrentStatus() async -> SubscriptionStatus? {
-        if let entitlementStatus = await statusFromCurrentEntitlements() {
-            return entitlementStatus
-        }
-
-        return await statusFromLatestTransactions()
-    }
-
-    private func statusFromCurrentEntitlements() async -> SubscriptionStatus? {
-        var newestTransaction: StoreKit.Transaction?
-
-        for await result in StoreKit.Transaction.currentEntitlements {
-            guard case .verified(let transaction) = result,
-                  productIDs.contains(transaction.productID),
-                  transaction.revocationDate == nil,
-                  !isExpired(transaction) else { continue }
-
-            if let existing = newestTransaction {
-                let existingExpiration = existing.expirationDate ?? .distantPast
-                let candidateExpiration = transaction.expirationDate ?? .distantPast
-                if candidateExpiration > existingExpiration {
-                    newestTransaction = transaction
-                }
-            } else {
-                newestTransaction = transaction
-            }
-        }
-
-        guard let activeTransaction = newestTransaction else { return nil }
-        return await status(for: activeTransaction)
-    }
-
-    private func statusFromLatestTransactions() async -> SubscriptionStatus? {
-        var newestTransaction: StoreKit.Transaction?
-
-        for productID in productIDs {
-            guard let latestResult = await StoreKit.Transaction.latest(for: productID) else { continue }
-            guard case .verified(let transaction) = latestResult,
-                  transaction.revocationDate == nil,
-                  !isExpired(transaction) else { continue }
-
-            if let existing = newestTransaction {
-                let existingExpiration = existing.expirationDate ?? .distantPast
-                let candidateExpiration = transaction.expirationDate ?? .distantPast
-                if candidateExpiration > existingExpiration {
-                    newestTransaction = transaction
-                }
-            } else {
-                newestTransaction = transaction
-            }
-        }
-
-        guard let activeTransaction = newestTransaction else { return nil }
-        return await status(for: activeTransaction)
-    }
-
-    private func observeTransactionUpdates() async {
-        for await result in StoreKit.Transaction.updates {
-            guard !Task.isCancelled else { return }
-
-            switch result {
-            case .verified(let transaction):
-                await transaction.finish()
-                await refreshEntitlements()
-            case .unverified:
-                continue
-            }
-        }
-    }
-
-    private func finishUnfinishedTransactions() async {
-        for await result in StoreKit.Transaction.unfinished {
-            guard case .verified(let transaction) = result else { continue }
-            await transaction.finish()
-        }
-    }
-
-    private func status(for transaction: StoreKit.Transaction) async -> SubscriptionStatus? {
-        let product = await product(for: transaction.productID)
-        let displayName = product?.displayName ?? transaction.productID
-
-        var isInGracePeriod = false
-        var isAutoRenewEnabled: Bool?
-        var isInTrial = false
-        var trialEndDate: Date?
-
-        if let currentStatus = await transaction.subscriptionStatus {
-            if currentStatus.state == .inGracePeriod {
-                isInGracePeriod = true
-            }
-
-            if case .verified(let renewalInfo) = currentStatus.renewalInfo {
-                isAutoRenewEnabled = renewalInfo.willAutoRenew
-
-                if renewalInfo.gracePeriodExpirationDate != nil {
-                    isInGracePeriod = true
-                }
-
-                if #available(iOS 18.0, macOS 15.0, tvOS 18.0, watchOS 11.0, visionOS 2.0, *) {
-                    if let offer = renewalInfo.offer, offer.type == .introductory {
-                        isInTrial = true
-                        trialEndDate = transaction.expirationDate
-                    }
-                } else {
-#if compiler(>=5.3)
-                    if renewalInfo.offerType == .introductory {
-                        isInTrial = true
-                        trialEndDate = transaction.expirationDate
-                    }
-#endif
-                }
-            } else if case .verified(let statusTransaction) = currentStatus.transaction {
-                if let offer = statusTransaction.offer, offer.type == .introductory {
-                    isInTrial = true
-                    trialEndDate = statusTransaction.expirationDate ?? transaction.expirationDate
-                }
-            }
-        } else if let offer = transaction.offer, offer.type == .introductory {
-            isInTrial = true
-            trialEndDate = transaction.expirationDate
-        }
-
-        return SubscriptionStatus(
-            productId: transaction.productID,
-            displayName: displayName,
-            renewalDate: transaction.expirationDate,
-            isInTrial: isInTrial,
-            trialEndDate: trialEndDate,
-            isInGracePeriod: isInGracePeriod,
-            isAutoRenewEnabled: isAutoRenewEnabled
-        )
-    }
-
-    private func isExpired(_ transaction: StoreKit.Transaction) -> Bool {
-        if let expirationDate = transaction.expirationDate {
-            return expirationDate < Date()
-        }
-        return false
-    }
-
-    private func product(for id: String) async -> Product? {
-        if let cached = productCache[id] {
-            return cached
-        }
-
-        guard let product = try? await Product.products(for: [id]).first else { return nil }
-        productCache[id] = product
-        return product
-    }
-}

Cable/Systems/SystemBillOfMaterialsView.swift

@@ -390,6 +390,10 @@ struct SystemBillOfMaterialsView: View {
             return
         }
 
+        AnalyticsTracker.log("BOM PDF Exported", properties: [
+            "system": systemName,
+            "item_count": categorySections.reduce(0) { $0 + $1.items.count },
+        ])
         isExportingPDF = true
         let exporter = SystemBillOfMaterialsPDFExporter()
         let sections = sectionSnapshots
@@ -488,6 +492,7 @@ struct SystemBillOfMaterialsView: View {
                 return
             }
             if let destinationURL {
+                trackAffiliateTap(item: item, url: destinationURL)
                 openURL(destinationURL)
             }
             setCompletion(true, for: item)
@@ -495,6 +500,18 @@ struct SystemBillOfMaterialsView: View {
         }
     }
 
+    private func trackAffiliateTap(item: Item, url: URL) {
+        let isAffiliate: Bool
+        if case .affiliate = item.destination { isAffiliate = true } else { isAffiliate = false }
+        AnalyticsTracker.log("BOM Item Tapped", properties: [
+            "item": item.title,
+            "category": item.category.rawValue,
+            "is_affiliate": isAffiliate,
+            "domain": url.host ?? "unknown",
+            "system": systemName,
+        ])
+    }
+
     private func shouldShowDetail(for item: Item) -> Bool {
         !item.detail.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
     }
@@ -640,14 +657,19 @@ struct SystemBillOfMaterialsView: View {
             crossSectionLabel.lowercased()
         )
         let affiliateURL = load.affiliateURLString.flatMap { URL(string: $0) }
+        let deviceFallbackFormat = NSLocalizedString("bom.search.device.fallback", comment: "Amazon search query fallback for a DC device")
         let deviceQuery = load.name.isEmpty
-            ? String(format: "DC device %.0fW %.0fV", calculatedPower, load.voltage)
+            ? String(format: deviceFallbackFormat, calculatedPower, load.voltage)
             : load.name
 
-        let redCableQuery = "\(gaugeQuery) red battery cable"
-        let blackCableQuery = "\(gaugeQuery) black battery cable"
-        let fuseQuery = "inline fuse holder \(fuseRating)A"
-        let terminalQuery = "\(gaugeQuery) cable shoes pack of \(terminalCount)"
+        let redCableSearchFormat = NSLocalizedString("bom.search.cable.red", comment: "Amazon search query for red battery cable")
+        let redCableQuery = String(format: redCableSearchFormat, gaugeQuery)
+        let blackCableSearchFormat = NSLocalizedString("bom.search.cable.black", comment: "Amazon search query for black battery cable")
+        let blackCableQuery = String(format: blackCableSearchFormat, gaugeQuery)
+        let fuseSearchFormat = NSLocalizedString("bom.search.fuse", comment: "Amazon search query for inline fuse holder")
+        let fuseQuery = String(format: fuseSearchFormat, fuseRating)
+        let terminalSearchFormat = NSLocalizedString("bom.search.terminals", comment: "Amazon search query for cable shoes")
+        let terminalQuery = String(format: terminalSearchFormat, gaugeQuery)
 
         let componentStorageKey = Self.storageKey(for: component, itemID: "component")
         let redCableStorageKey = Self.storageKey(for: component, itemID: "cable-red")
@@ -762,7 +784,12 @@ struct SystemBillOfMaterialsView: View {
         let detail = [capacityLabel, battery.chemistry.displayName, usableLabel].joined(separator: " • ")
         let capacityQuery = max(1, Int(round(battery.capacityAmpHours)))
         let voltageQuery = max(1, Int(round(battery.nominalVoltage)))
-        let query = "\(capacityQuery)Ah \(voltageQuery)V \(battery.chemistry.displayName) battery"
+        let batterySearchFormat = NSLocalizedString(
+            "bom.search.battery",
+            comment: "Amazon search query for a battery"
+        )
+        let query = String(format: batterySearchFormat, capacityQuery, voltageQuery, battery.chemistry.displayName)
+        let affiliateURL = battery.affiliateURLString.flatMap { URL(string: $0) }
         let storageKey = Self.storageKey(for: component, itemID: "battery")
 
         return [
@@ -773,7 +800,7 @@ struct SystemBillOfMaterialsView: View {
                 title: battery.name.isEmpty ? String(localized: "component.fallback.name", comment: "Fallback name for a component when no name is provided") : battery.name,
                 detail: detail,
                 iconSystemName: battery.iconName,
-                destination: .amazonSearch(query),
+                destination: affiliateURL.map { .affiliate($0) } ?? .amazonSearch(query),
                 isPrimaryComponent: true,
                 components: [component],
                 category: .batteries,
@@ -834,8 +861,8 @@ struct SystemBillOfMaterialsView: View {
         switch component {
         case .load(let load):
             return load.affiliateCountryCode
-        case .battery:
-            return nil
+        case .battery(let battery):
+            return battery.affiliateCountryCode
         case .charger(let charger):
             return charger.affiliateCountryCode
         }

Cable/Systems/SystemComponentsPersistence.swift

@@ -263,7 +263,7 @@ struct SystemComponentsPersistence {
         )
         let charger = SavedCharger(
             name: chargerName,
-            inputVoltage: 230,
+            inputVoltage: LocaleDefaults.mainsVoltage,
             outputVoltage: 14.4,
             maxCurrentAmps: 30,
             iconName: "bolt.fill",

Cable/UITestSampleData.swift

@@ -186,7 +186,7 @@ extension UITestSampleData {
 
         let shoreCharger = SavedCharger(
             name: String(localized: "sample.charger.shore.name", comment: "Sample data name for a shore power charger"),
-            inputVoltage: 230.0,
+            inputVoltage: LocaleDefaults.mainsVoltage,
             outputVoltage: 14.4,
             maxCurrentAmps: 40.0,
             maxPowerWatts: 600.0,

Cable/UnitSystem.swift

@@ -39,22 +39,32 @@ enum UnitSystem: String, CaseIterable {
     }
 }
 
+enum LocaleDefaults {
+    private static let lowVoltageRegions: Set<String> = [
+        "US", "CA", "MX", "JP", "TW", "CO", "VE", "BR"
+    ]
+
+    static var mainsVoltage: Double {
+        let region = Locale.current.region?.identifier.uppercased() ?? ""
+        return lowVoltageRegions.contains(region) ? 120.0 : 230.0
+    }
+}
+
 @MainActor
 class UnitSystemSettings: ObservableObject {
     @Published var unitSystem: UnitSystem {
         didSet {
             UserDefaults.standard.set(unitSystem.rawValue, forKey: "unitSystem")
-        }
-    }
-    @Published var isProUnlocked: Bool {
-        didSet {
-            UserDefaults.standard.set(isProUnlocked, forKey: "isProUnlocked")
+            AnalyticsTracker.log("Unit System Changed", properties: ["system": unitSystem.rawValue])
         }
     }
 
     init() {
-        let savedSystem = UserDefaults.standard.string(forKey: "unitSystem") ?? UnitSystem.metric.rawValue
-        self.unitSystem = UnitSystem(rawValue: savedSystem) ?? .metric
-        self.isProUnlocked = UserDefaults.standard.bool(forKey: "isProUnlocked")
+        if let saved = UserDefaults.standard.string(forKey: "unitSystem"),
+           let system = UnitSystem(rawValue: saved) {
+            self.unitSystem = system
+        } else {
+            self.unitSystem = Locale.current.measurementSystem == .us ? .imperial : .metric
+        }
     }
 }

Cable/de.lproj/Localizable.strings

@@ -143,6 +143,12 @@
 "bom.navigation.title" = "Stückliste";
 "bom.navigation.title.system" = "Stückliste – %@";
 "bom.size.unknown" = "Größe offen";
+"bom.search.battery" = "%dAh %dV %@ Batterie";
+"bom.search.cable.black" = "%@ schwarzes Batteriekabel";
+"bom.search.cable.red" = "%@ rotes Batteriekabel";
+"bom.search.device.fallback" = "DC Gerät %.0fW %.0fV";
+"bom.search.fuse" = "KFZ Sicherungshalter %dA";
+"bom.search.terminals" = "%@ Kabelschuhe";
 "bom.terminals.detail" = "Ring- oder Gabelkabelschuhe für %@-Leitungen";
 "bom.empty.message" = "Dieses System hat noch keine Komponenten.";
 "bom.export.pdf.button" = "PDF exportieren";

Cable/es.lproj/Localizable.strings

@@ -13,6 +13,12 @@
 "bom.navigation.title" = "Lista de materiales";
 "bom.navigation.title.system" = "Lista de materiales – %@";
 "bom.size.unknown" = "Tamaño por definir";
+"bom.search.battery" = "%dAh %dV %@ batería";
+"bom.search.cable.black" = "%@ cable batería negro";
+"bom.search.cable.red" = "%@ cable batería rojo";
+"bom.search.device.fallback" = "dispositivo DC %.0fW %.0fV";
+"bom.search.fuse" = "portafusible en línea %dA";
+"bom.search.terminals" = "%@ terminales de cable";
 "bom.terminals.detail" = "Terminales de anillo o de horquilla para cables de %@";
 "bom.empty.message" = "Todavía no hay componentes guardados en este sistema.";
 "bom.export.pdf.button" = "Exportar PDF";

Cable/fr.lproj/Localizable.strings

@@ -13,6 +13,12 @@
 "bom.navigation.title" = "Liste de matériel";
 "bom.navigation.title.system" = "Liste de matériel – %@";
 "bom.size.unknown" = "Taille à déterminer";
+"bom.search.battery" = "%dAh %dV %@ batterie";
+"bom.search.cable.black" = "%@ câble batterie noir";
+"bom.search.cable.red" = "%@ câble batterie rouge";
+"bom.search.device.fallback" = "appareil DC %.0fW %.0fV";
+"bom.search.fuse" = "porte-fusible %dA";
+"bom.search.terminals" = "%@ cosses de câble";
 "bom.terminals.detail" = "Cosses à œillet ou à fourche adaptées aux câbles de %@";
 "bom.empty.message" = "Aucun composant enregistré pour ce système pour l’instant.";
 "bom.export.pdf.button" = "Exporter en PDF";

Cable/nl.lproj/Localizable.strings

@@ -13,6 +13,12 @@
 "bom.navigation.title" = "Materiaallijst";
 "bom.navigation.title.system" = "Materiaallijst – %@";
 "bom.size.unknown" = "Afmeting nog onbekend";
+"bom.search.battery" = "%dAh %dV %@ batterij";
+"bom.search.cable.black" = "%@ zwarte accukabel";
+"bom.search.cable.red" = "%@ rode accukabel";
+"bom.search.device.fallback" = "DC apparaat %.0fW %.0fV";
+"bom.search.fuse" = "inline zekeringhouder %dA";
+"bom.search.terminals" = "%@ kabelschoenen";
 "bom.terminals.detail" = "Ring- of vorkklemmen geschikt voor %@-bekabeling";
 "bom.empty.message" = "Er zijn nog geen componenten voor dit systeem opgeslagen.";
 "bom.export.pdf.button" = "PDF exporteren";