feat(#43): Downgrade App Lifecycle and Navigation Framework

Sources/App/MacMonitorApp.swift

@@ -3,7 +3,6 @@ import Combine
 
 /// Bridges app-lifecycle events into SwiftUI: requests Notification Center
 /// authorization once at launch so threshold alerts can post banners.
-@MainActor
 final class AppDelegate: NSObject, NSApplicationDelegate {
     var statusItem: NSStatusItem?
     var popover: NSPopover?
@@ -75,62 +74,3 @@ struct MacMonitorApp: App {
         }
     }
 }
-
-// MARK: - UI Shims (macOS 12 Support)
-
-public struct MMLabeledContent<Label: View, Content: View>: View {
-    public let label: Label
-    public let content: Content
-
-    public init(@ViewBuilder content: () -> Content, @ViewBuilder label: () -> Label) {
-        self.label = label()
-        self.content = content()
-    }
-
-    public init(_ titleKey: LocalizedStringKey, @ViewBuilder content: () -> Content) where Label == Text {
-        self.label = Text(titleKey)
-        self.content = content()
-    }
-
-    public init<S: StringProtocol>(_ title: S, @ViewBuilder content: () -> Content) where Label == Text {
-        self.label = Text(title)
-        self.content = content()
-    }
-
-    public var body: some View {
-        HStack {
-            label
-            Spacer()
-            content
-        }
-    }
-}
-
-public extension View {
-    @ViewBuilder
-    func mmMonospaced() -> some View {
-        if #available(macOS 13.0, *) {
-            self.monospaced()
-        } else {
-            self
-        }
-    }
-    
-    @ViewBuilder
-    func mmMonospacedDigit() -> some View {
-        if #available(macOS 13.0, *) {
-            self.monospacedDigit()
-        } else {
-            self
-        }
-    }
-    
-    @ViewBuilder
-    func mmFormStyleGrouped() -> some View {
-        if #available(macOS 13.0, *) {
-            self.formStyle(.grouped)
-        } else {
-            self
-        }
-    }
-}

Sources/Intelligence/AlertNotificationDispatcher.swift

@@ -118,12 +118,11 @@ public final class UNAlertNotificationDispatcher: NSObject, AlertNotificationDis
         didReceive response: UNNotificationResponse,
         withCompletionHandler completionHandler: @escaping () -> Void
     ) {
-        let targetTab: String?
+        let targetTab: String? = switch response.actionIdentifier {
-        switch response.actionIdentifier {
         case AlertNotificationAction.viewProcessesIdentifier:
-            targetTab = "Processes"
+            "Processes"
         default:
-            targetTab = nil
+            nil
         }
         Task { @MainActor in
             AppNavigationBus.shared.request(tab: targetTab)

Sources/UI/Alerts/AlertsView.swift

@@ -4,9 +4,8 @@ import SwiftUI
 
 /// Sidebar tab showing currently breached thresholds and the in-app
 /// alert history log maintained by `AlertEngine`.
-@MainActor
 public struct AlertsView: View {
-    @ObservedObject private var engine = AlertEngine.shared
+    @State private var engine = AlertEngine.shared
 
     public init() {}
 
@@ -110,7 +109,7 @@ public struct AlertsView: View {
                             Text(event.alertID)
                                 .font(.caption2)
                                 .foregroundStyle(.secondary)
-                                .mmMonospaced()
+                                .monospaced()
                         }
                         Spacer()
                         Text(event.timestamp.formatted(date: .abbreviated, time: .standard))

Sources/UI/Charts/TelemetryTrendChartView.swift

@@ -1,7 +1,5 @@
 import SwiftUI
-#if canImport(Charts)
 import Charts
-#endif
 
 public struct TelemetryTrendChartView: View {
     public let title: String
@@ -45,7 +43,8 @@ public struct TelemetryTrendChartView: View {
                 Spacer()
                 HStack(spacing: 12) {
                     Text(String(format: "Cur: %.1f %@", currentValue, unit))
-                        .font(.system(size: 11, weight: .semibold))
+                        .font(.caption)
+                        .fontWeight(.semibold)
                         .foregroundColor(color)
                     Text(String(format: "Avg: %.1f %@", averageValue, unit))
                         .font(.caption)
@@ -56,78 +55,35 @@ public struct TelemetryTrendChartView: View {
                 }
             }
             
-            #if canImport(Charts)
+            Chart {
-            if #available(macOS 13.0, *) {
+                ForEach(Array(samples.enumerated()), id: \.element.id) { index, sample in
-                Chart {
+                    LineMark(
-                    ForEach(Array(samples.enumerated()), id: \.element.id) { index, sample in
+                        x: .value("Sample", index),
-                        LineMark(
+                        y: .value("Value", sample.value)
-                            x: .value("Sample", index),
+                    )
-                            y: .value("Value", sample.value)
+                    .interpolationMethod(.monotone)
+                    .foregroundStyle(color)
+                    
+                    AreaMark(
+                        x: .value("Sample", index),
+                        y: .value("Value", sample.value)
+                    )
+                    .interpolationMethod(.monotone)
+                    .foregroundStyle(
+                        LinearGradient(
+                            colors: [color.opacity(0.35), color.opacity(0.05)],
+                            startPoint: .top,
+                            endPoint: .bottom
                         )
-                        .interpolationMethod(.monotone)
+                    )
-                        .foregroundStyle(color)
-                        
-                        AreaMark(
-                            x: .value("Sample", index),
-                            y: .value("Value", sample.value)
-                        )
-                        .interpolationMethod(.monotone)
-                        .foregroundStyle(
-                            LinearGradient(
-                                colors: [color.opacity(0.35), color.opacity(0.05)],
-                                startPoint: .top,
-                                endPoint: .bottom
-                            )
-                        )
-                    }
                 }
-                .chartYScale(domain: 0...(maxY ?? max(1.0, maxValue * 1.15)))
-                .chartXAxis(.hidden)
-                .frame(height: 120)
-            } else {
-                fallbackChart
             }
-            #else
+            .chartYScale(domain: 0...(maxY ?? max(1.0, maxValue * 1.15)))
-            fallbackChart
+            .chartXAxis(.hidden)
-            #endif
+            .frame(height: 120)
         }
         .padding(14)
         .background(Color(NSColor.controlBackgroundColor))
         .cornerRadius(10)
     }
-
-    @ViewBuilder
-    private var fallbackChart: some View {
-        Canvas { context, size in
-            guard samples.count > 1 else { return }
-            let effectiveMaxY = maxY ?? max(1.0, maxValue * 1.15)
-            let dx = size.width / CGFloat(samples.count - 1)
-            var path = Path()
-            var areaPath = Path()
-            
-            for (index, sample) in samples.enumerated() {
-                let x = CGFloat(index) * dx
-                let y = size.height - (CGFloat(sample.value) / CGFloat(effectiveMaxY)) * size.height
-                
-                if index == 0 {
-                    path.move(to: CGPoint(x: x, y: y))
-                    areaPath.move(to: CGPoint(x: x, y: size.height))
-                    areaPath.addLine(to: CGPoint(x: x, y: y))
-                } else {
-                    path.addLine(to: CGPoint(x: x, y: y))
-                    areaPath.addLine(to: CGPoint(x: x, y: y))
-                }
-            }
-            
-            if let lastIndex = samples.indices.last {
-                let lastX = CGFloat(lastIndex) * dx
-                areaPath.addLine(to: CGPoint(x: lastX, y: size.height))
-                areaPath.closeSubpath()
-            }
-            
-            context.fill(areaPath, with: .linearGradient(Gradient(colors: [color.opacity(0.35), color.opacity(0.05)]), startPoint: .zero, endPoint: CGPoint(x: 0, y: size.height)))
-            context.stroke(path, with: .color(color), lineWidth: 2)
-        }
-        .frame(height: 120)
-    }
 }

Sources/UI/ContentView.swift

@@ -1,9 +1,8 @@
 import SwiftUI
 
-@MainActor
 public struct ContentView: View {
     @StateObject private var store = SystemTelemetryStore.shared
-    @State private var selectedTab: String? = "Dashboard"
+    @State private var selectedTab: String = "Dashboard"
     @State private var processSearchText: String = ""
     @State private var socketSearchText: String = ""
     @State private var selectedPID: Int32? = nil
@@ -120,7 +119,7 @@ public struct ContentView: View {
                 headerCard
                 engineControlCard
                 
-                switch selectedTab ?? "Dashboard" {
+                switch selectedTab {
                 case "Dashboard":
                     dashboardView
                 case "Architecture":
@@ -169,7 +168,7 @@ public struct ContentView: View {
             }
             .padding(24)
         }
-        .navigationTitle("MacMonitor — \(selectedTab ?? "Dashboard")")
+        .navigationTitle("MacMonitor — \(selectedTab)")
     }
     
     // MARK: - Dashboard Composite View
@@ -358,20 +357,20 @@ public struct ContentView: View {
             Label("Kernel & VM Telemetry", systemImage: "waveform.path.ecg")
                 .font(.headline)
             
-            VStack(alignment: .leading, spacing: 8) {
+            Grid(alignment: .leading, horizontalSpacing: 20, verticalSpacing: 8) {
-                HStack {
+                GridRow {
                     Text("Context Switches:").foregroundStyle(.secondary)
                     Text("\(Int(store.kernelCounters.contextSwitchesPerSec))/s").bold().monospacedDigit()
                     Text("Syscalls:").foregroundStyle(.secondary)
                     Text("\(Int(store.kernelCounters.syscallsPerSec))/s").bold().monospacedDigit()
                 }
-                HStack {
+                GridRow {
                     Text("Page Faults:").foregroundStyle(.secondary)
                     Text("\(Int(store.kernelCounters.pageFaultsPerSec))/s").bold().monospacedDigit()
                     Text("COW Faults:").foregroundStyle(.secondary)
                     Text("\(Int(store.kernelCounters.cowFaultsPerSec))/s").bold().monospacedDigit()
                 }
-                HStack {
+                GridRow {
                     Text("Pageins / Pageouts:").foregroundStyle(.secondary)
                     Text("\(Int(store.kernelCounters.pageinsPerSec)) / \(Int(store.kernelCounters.pageoutsPerSec)) /s").bold().monospacedDigit()
                     Text("Zero-Fill:").foregroundStyle(.secondary)
@@ -446,20 +445,20 @@ public struct ContentView: View {
             ProgressView(value: min(store.memory.utilizationPercentage / 100.0, 1.0))
                 .tint(store.memory.utilizationPercentage > 85 ? .red : .blue)
             
-            VStack(alignment: .leading, spacing: 6) {
+            Grid(alignment: .leading, horizontalSpacing: 20, verticalSpacing: 6) {
-                HStack {
+                GridRow {
                     Text("Used:").foregroundStyle(.secondary)
                     Text(formatBytes(store.memory.usedBytes)).bold()
                     Text("Free:").foregroundStyle(.secondary)
                     Text(formatBytes(store.memory.freeBytes)).bold()
                 }
-                HStack {
+                GridRow {
                     Text("Wired:").foregroundStyle(.secondary)
                     Text(formatBytes(store.memory.wiredBytes))
                     Text("Compressed:").foregroundStyle(.secondary)
                     Text(formatBytes(store.memory.compressedBytes))
                 }
-                HStack {
+                GridRow {
                     Text("Swap Used:").foregroundStyle(.secondary)
                     Text(formatBytes(store.memory.swapUsedBytes))
                     Text("Swap Total:").foregroundStyle(.secondary)
@@ -603,10 +602,10 @@ public struct ContentView: View {
                     Text(s.protocolName)
                 }
                 TableColumn("Local Endpoint") { s in
-                    Text("\(s.localAddress):\(s.localPort)").mmMonospaced()
+                    Text("\(s.localAddress):\(s.localPort)").monospaced()
                 }
                 TableColumn("Remote Endpoint") { s in
-                    Text("\(s.remoteAddress):\(s.remotePort)").mmMonospaced()
+                    Text("\(s.remoteAddress):\(s.remotePort)").monospaced()
                 }
                 TableColumn("State") { s in
                     Text(s.tcpState).font(.caption).foregroundStyle(s.tcpState == "ESTABLISHED" ? .green : .secondary)
@@ -752,20 +751,20 @@ public struct ContentView: View {
             if !store.batteryHealth.hasBattery {
                 Text("Desktop Mac / No battery installed").font(.caption).foregroundStyle(.secondary)
             } else {
-                VStack(alignment: .leading, spacing: 6) {
+                Grid(alignment: .leading, horizontalSpacing: 20, verticalSpacing: 6) {
-                    HStack {
+                    GridRow {
                         Text("Cycle Count:").foregroundStyle(.secondary)
                         Text("\(store.batteryHealth.cycleCount) / \(store.batteryHealth.designCycleCount)").bold()
                         Text("Temperature:").foregroundStyle(.secondary)
                         Text(String(format: "%.1f°C", store.batteryHealth.temperature)).bold()
                     }
-                    HStack {
+                    GridRow {
                         Text("Voltage / Power:").foregroundStyle(.secondary)
                         Text("\(String(format: "%.2f V", store.batteryHealth.voltage)) (\(String(format: "%.1f W", store.batteryHealth.watts)))")
                         Text("Power Adapter:").foregroundStyle(.secondary)
                         Text(store.batteryHealth.externalConnected ? "\(store.batteryHealth.adapterWatts)W Connected" : "On Battery")
                     }
-                    HStack {
+                    GridRow {
                         Text("Capacity:").foregroundStyle(.secondary)
                         Text("\(store.batteryHealth.currentCapacity) / \(store.batteryHealth.maxCapacity) mAh")
                         Text("Manufacturer:").foregroundStyle(.secondary)
@@ -798,10 +797,10 @@ public struct ContentView: View {
                         .background(Color.secondary.opacity(0.15), in: Capsule())
                 }
                 TableColumn("Vendor ID") { d in
-                    Text(String(format: "0x%04x", d.vendorID)).mmMonospaced()
+                    Text(String(format: "0x%04x", d.vendorID)).monospaced()
                 }
                 TableColumn("Product ID") { d in
-                    Text(String(format: "0x%04x", d.productID)).mmMonospaced()
+                    Text(String(format: "0x%04x", d.productID)).monospaced()
                 }
                 TableColumn("Built-In") { d in
                     Text(d.isBuiltIn ? "Yes" : "External").foregroundStyle(d.isBuiltIn ? Color.secondary : Color.blue)
@@ -962,14 +961,14 @@ public struct ContentView: View {
                     .font(.title3.bold().monospacedDigit())
             }
             
-            VStack(alignment: .leading, spacing: 6) {
+            Grid(alignment: .leading, horizontalSpacing: 20, verticalSpacing: 6) {
-                HStack {
+                GridRow {
                     Text("CPU Power:").foregroundStyle(.secondary)
                     Text(String(format: "%.1f W", store.power.cpuWatts)).bold()
                     Text("GPU Power:").foregroundStyle(.secondary)
                     Text(String(format: "%.1f W", store.power.gpuWatts)).bold()
                 }
-                HStack {
+                GridRow {
                     Text("CPU Voltage:").foregroundStyle(.secondary)
                     Text(String(format: "%.2f V", store.power.cpuVoltage))
                     Text("CPU Current:").foregroundStyle(.secondary)
@@ -990,22 +989,24 @@ public struct ContentView: View {
             Text("Host Architecture & Kernel")
                 .font(.headline)
             
-            VStack(alignment: .leading, spacing: 10) {
+            Grid(alignment: .leading, horizontalSpacing: 24, verticalSpacing: 10) {
-                HStack {
+                GridRow {
                     Text("Hardware Model:").foregroundStyle(.secondary)
                     Text(store.hostModel).bold()
                     Text("Physical Cores:").foregroundStyle(.secondary)
                     Text("\(store.physicalCpuCount)").bold()
                 }
-                HStack {
+                GridRow {
                     Text("Darwin Kernel:").foregroundStyle(.secondary)
                     Text(store.kernelVersion).bold()
                     Text("Logical Cores:").foregroundStyle(.secondary)
                     Text("\(store.logicalCpuCount)").bold()
                 }
-                HStack {
+                GridRow {
                     Text("Target Architecture:").foregroundStyle(.secondary)
                     Text("Intel x86_64").bold()
+                    Text("Deployment Target:").foregroundStyle(.secondary)
+                    Text("macOS 14.0 (Sonoma)").bold()
                 }
             }
         }
@@ -1219,7 +1220,6 @@ public struct ContentView: View {
 }
 
 // MARK: - Process Detail Inspector Sheet
-@MainActor
 struct ProcessDetailSheet: View {
     let inspector: MMProcessDetailInspector
     let pid: Int32
@@ -1248,9 +1248,8 @@ struct ProcessDetailSheet: View {
             if selectedDetailTab == "Threads" {
                 List(threads.indices, id: \.self) { idx in
                     let t = threads[idx]
-                    let threadID = "\(t["threadID"] ?? idx)"
                     HStack {
-                        Text("Thread \(threadID)").bold()
+                        Text("Thread \(t["threadID"] ?? idx)").bold()
                         Spacer()
                         Text("CPU: \(String(format: "%.1f%%", (t["cpuPercent"] as? Double) ?? 0.0))").monospacedDigit()
                         Text(t["state"] as? String ?? "").foregroundStyle(.secondary)
@@ -1263,16 +1262,11 @@ struct ProcessDetailSheet: View {
             } else {
                 List(sockets.indices, id: \.self) { idx in
                     let s = sockets[idx]
-                    let proto = s["protocol"] as? String ?? "TCP"
-                    let localAddr = (s["localAddress"] as? String) ?? ""
-                    let localPort = (s["localPort"] as? Int) ?? 0
-                    let remoteAddr = (s["remoteAddress"] as? String) ?? ""
-                    let remotePort = (s["remotePort"] as? Int) ?? 0
                     HStack {
-                        Text(proto).bold()
+                        Text(s["protocol"] as? String ?? "TCP").bold()
                         Spacer()
-                        Text("\(localAddr):\(localPort) → \(remoteAddr):\(remotePort)")
+                        Text("\(s["localAddress"] ?? ""):\(s["localPort"] ?? 0) → \(s["remoteAddress"] ?? ""):\(s["remotePort"] ?? 0)")
-                            .mmMonospaced()
+                            .monospaced()
                         Text(s["tcpState"] as? String ?? "").foregroundStyle(.secondary)
                     }
                 }

Sources/UI/MenuBar/QuickGlancePopoverView.swift

@@ -1,8 +1,7 @@
 import SwiftUI
 
-@MainActor
 public struct QuickGlancePopoverView: View {
-    @ObservedObject var store: SystemTelemetryStore
+    var store: SystemTelemetryStore
     
     public init(store: SystemTelemetryStore) {
         self.store = store
@@ -110,7 +109,9 @@ public struct QuickGlancePopoverView: View {
             }
             Spacer()
             Text(value)
-                .font(.system(size: 13, weight: .semibold, design: .monospaced))
+                .font(.subheadline)
+                .fontWeight(.semibold)
+                .fontDesign(.monospaced)
         }
     }
     

Sources/UI/Settings/AlertsSettingsView.swift

@@ -5,7 +5,6 @@ import UserNotifications
 
 /// Preferences UI for threshold alert rules. Bound directly to
 /// `AlertEngine.shared.configuration`, which auto-persists to `UserDefaults`.
-@MainActor
 public struct AlertsSettingsView: View {
     @ObservedObject private var engine = AlertEngine.shared
     @State private var authorizationStatus: UNAuthorizationStatus = .notDetermined
@@ -59,24 +58,24 @@ public struct AlertsSettingsView: View {
 
             Section("CPU Temperature") {
                 Toggle("High CPU Temperature Alert", isOn: $engine.configuration.cpuTempEnabled)
-                MMLabeledContent("Threshold") {
+                LabeledContent("Threshold") {
                     Slider(value: $engine.configuration.cpuTempThresholdC, in: 60...110, step: 1) {
                         EmptyView()
                     }
                     Text("\(Int(engine.configuration.cpuTempThresholdC))°C")
-                        .mmMonospacedDigit()
+                        .monospacedDigit()
                         .frame(width: 48, alignment: .trailing)
                 }
             }
 
             Section("Cooling Fans") {
                 Toggle("Fan Stall Alert", isOn: $engine.configuration.fanStallEnabled)
-                MMLabeledContent("Alert when CPU above") {
+                LabeledContent("Alert when CPU above") {
                     Slider(value: $engine.configuration.fanStallTempThresholdC, in: 40...100, step: 1) {
                         EmptyView()
                     }
                     Text("\(Int(engine.configuration.fanStallTempThresholdC))°C")
-                        .mmMonospacedDigit()
+                        .monospacedDigit()
                         .frame(width: 48, alignment: .trailing)
                 }
                 Text("Triggers when a fan reports 0 RPM while the CPU is hot.")
@@ -86,12 +85,12 @@ public struct AlertsSettingsView: View {
 
             Section("Memory") {
                 Toggle("Low Memory Alert", isOn: $engine.configuration.memoryEnabled)
-                MMLabeledContent("Free RAM below") {
+                LabeledContent("Free RAM below") {
                     Slider(value: $engine.configuration.memoryFreeMBThreshold, in: 100...4096, step: 50) {
                         EmptyView()
                     }
                     Text("\(Int(engine.configuration.memoryFreeMBThreshold)) MB")
-                        .mmMonospacedDigit()
+                        .monospacedDigit()
                         .frame(width: 64, alignment: .trailing)
                 }
                 Toggle("Alert on Critical Memory Pressure", isOn: $engine.configuration.memoryAlertOnCriticalPressure)
@@ -99,32 +98,32 @@ public struct AlertsSettingsView: View {
 
             Section("Storage") {
                 Toggle("Low Disk Space Alert", isOn: $engine.configuration.storageEnabled)
-                MMLabeledContent("Free space below") {
+                LabeledContent("Free space below") {
                     Slider(value: $engine.configuration.storageFreeGBThreshold, in: 1...100, step: 1) {
                         EmptyView()
                     }
                     Text("\(Int(engine.configuration.storageFreeGBThreshold)) GB")
-                        .mmMonospacedDigit()
+                        .monospacedDigit()
                         .frame(width: 48, alignment: .trailing)
                 }
-                MMLabeledContent("Free percent below") {
+                LabeledContent("Free percent below") {
                     Slider(value: $engine.configuration.storageFreePercentThreshold, in: 1...50, step: 1) {
                         EmptyView()
                     }
                     Text("\(Int(engine.configuration.storageFreePercentThreshold))%")
-                        .mmMonospacedDigit()
+                        .monospacedDigit()
                         .frame(width: 48, alignment: .trailing)
                 }
             }
 
             Section("Battery") {
                 Toggle("Low Battery Alert", isOn: $engine.configuration.batteryEnabled)
-                MMLabeledContent("Charge below") {
+                LabeledContent("Charge below") {
                     Slider(value: $engine.configuration.batteryPercentThreshold, in: 1...50, step: 1) {
                         EmptyView()
                     }
                     Text("\(Int(engine.configuration.batteryPercentThreshold))%")
-                        .mmMonospacedDigit()
+                        .monospacedDigit()
                         .frame(width: 48, alignment: .trailing)
                 }
                 Text("Only fires while discharging on battery power.")
@@ -132,7 +131,7 @@ public struct AlertsSettingsView: View {
                     .foregroundStyle(.secondary)
             }
         }
-        .mmFormStyleGrouped()
+        .formStyle(.grouped)
         .frame(minWidth: 480, minHeight: 520)
         .task { await refreshAuthorizationStatus() }
     }

Tests/MMMenuBarTests.swift

@@ -2,7 +2,6 @@ import XCTest
 import SwiftUI
 @testable import MacMonitor
 
-@MainActor
 final class MMMenuBarTests: XCTestCase {
     
     func testMenuBarStatusViewInitialization() {