refactor: improve task management in PortForward and AppState classes

Author: productdevbook

platforms/macos/Sources/AppState+AutoRefresh.swift

@@ -10,6 +10,7 @@ extension AppState {
 
     /// Starts a background task that periodically refreshes the port list.
     func startAutoRefresh() {
+        stopAutoRefresh()
         refreshTask = Task { @MainActor in
             await self.refresh()
             while !Task.isCancelled {

platforms/macos/Sources/Managers/PortForwardManager+Monitoring.swift

@@ -3,6 +3,11 @@ import Foundation
 extension PortForwardManager {
     /// Starts the connection monitoring task.
     func startMonitoring() {
+        if isMonitoring, let monitorTask, !monitorTask.isCancelled {
+            return
+        }
+
+        monitorTask?.cancel()
         isMonitoring = true
         monitorTask = Task {
             while !Task.isCancelled && isMonitoring {

platforms/macos/Sources/Managers/PortForwardManager.swift

@@ -134,6 +134,9 @@ final class PortForwardManager {
     func startConnection(_ id: UUID) {
         guard !isKillingProcesses else { return }
         guard let state = connection(for: id) else { return }
+        guard state.portForwardTask == nil, state.proxyTask == nil else { return }
+        guard state.portForwardStatus != .connecting, state.proxyStatus != .connecting else { return }
+        guard !state.isFullyConnected else { return }
         let config = state.config
 
         // Reset intentional stop flag when starting

platforms/macos/Sources/Managers/PortForwardProcessManager+Execution.swift

@@ -27,6 +27,11 @@ extension PortForwardProcessManager {
         process.standardOutput = pipe
         process.standardError = pipe
 
+        outputTasks[id]?[.portForward]?.cancel()
+        if let existing = processes[id]?[.portForward], existing.isRunning {
+            existing.terminate()
+        }
+
         try process.run()
 
         if processes[id] == nil {
@@ -60,6 +65,11 @@ extension PortForwardProcessManager {
         process.standardOutput = pipe
         process.standardError = pipe
 
+        outputTasks[id]?[.proxy]?.cancel()
+        if let existing = processes[id]?[.proxy], existing.isRunning {
+            existing.terminate()
+        }
+
         try process.run()
 
         if processes[id] == nil {
@@ -116,6 +126,11 @@ extension PortForwardProcessManager {
         process.standardOutput = pipe
         process.standardError = pipe
 
+        outputTasks[id]?[.proxy]?.cancel()
+        if let existing = processes[id]?[.proxy], existing.isRunning {
+            existing.terminate()
+        }
+
         try process.run()
 
         if processes[id] == nil {

platforms/macos/Sources/Managers/PortForwardProcessManager.swift

@@ -33,6 +33,8 @@ actor PortForwardProcessManager {
     // MARK: - Output Reading
 
     func startReadingOutput(pipe: Pipe, id: UUID, type: PortForwardProcessType) {
+        outputTasks[id]?[type]?.cancel()
+
         let task = Task { [weak self] in
             let handle = pipe.fileHandleForReading