fix: prevent hang on coordinator dealloc and concurrent WindowOpener waits

- Resume saveCompletionContinuation in MainContentCoordinator.deinit to
  prevent permanent hang if coordinator deallocates during save
- Support multiple concurrent waitUntilReady() callers in WindowOpener
  by using an array of continuations instead of a single optional

Author: datlechin

CHANGELOG.md

@@ -24,6 +24,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Replace event monitor with native SwiftUI .onKeyPress() in connection switcher
 - Extract reusable SearchFieldView component from 4 custom search field implementations
 - Replace timing hacks with structured signals (polling loops, arbitrary delays)
+- Fix potential hang when coordinator deallocates during save (saveCompletionContinuation)
+- Fix potential hang when multiple subsystems await WindowOpener readiness simultaneously
 
 ### Changed
 

TablePro/Core/Services/Infrastructure/WindowOpener.swift

@@ -15,15 +15,17 @@ internal final class WindowOpener {
 
     internal static let shared = WindowOpener()
 
-    private var readyContinuation: CheckedContinuation<Void, Never>?
+    private var readyContinuations: [CheckedContinuation<Void, Never>] = []
 
     /// Set on appear by ContentView, WelcomeViewModel, or ConnectionFormView.
     /// Safe to store — OpenWindowAction is app-scoped, not view-scoped.
     internal var openWindow: OpenWindowAction? {
         didSet {
             if openWindow != nil {
-                readyContinuation?.resume()
-                readyContinuation = nil
+                for continuation in readyContinuations {
+                    continuation.resume()
+                }
+                readyContinuations.removeAll()
             }
         }
     }
@@ -35,7 +37,7 @@ internal final class WindowOpener {
             if openWindow != nil {
                 continuation.resume()
             } else {
-                readyContinuation = continuation
+                readyContinuations.append(continuation)
             }
         }
     }

TablePro/Views/Main/MainContentCoordinator.swift

@@ -410,6 +410,9 @@ final class MainContentCoordinator {
     }
 
     deinit {
+        saveCompletionContinuation?.resume(returning: false)
+        saveCompletionContinuation = nil
+
         let connectionId = connection.id
         let alreadyHandled = _didTeardown.withLock { $0 } || _teardownScheduled.withLock { $0 }