[BUG] iOS26: Modern SwiftUI alert modifiers have timing issues with FlowStack navigation

[bobkexit]

Title

Modern SwiftUI alert modifiers have timing issues with FlowStack navigation

Description

Problem:
Modern SwiftUI alert modifiers (.alert(_:isPresented:actions:message:) and .alert(_:isPresented:presenting:actions:)) work with FlowStack but have presentation timing issues. Alerts triggered on pushed screens only become visible when navigating back to previous screens.

Expected Behavior:
Alerts should appear immediately when triggered, regardless of the navigation stack depth within FlowStack.

Actual Behavior:

• Alerts work normally on the root screen
• On pushed screens, alerts are triggered but not displayed until navigating back
• The deprecated Alert API works correctly on all screens

Steps to Reproduce:

1. Navigate to a pushed screen in FlowStack
2. Trigger an alert using modern API
3. Alert doesn't appear
4. Navigate back - alert becomes visible on previous screen

Code Example:

FlowStack($coordinator.routes, withNavigation: true) {
    ProfileView(viewModel: coordinator.rootViewModel)
        .flowDestination(for: ProfileRoute.self) { route in
            screen(for: route)
        }
}
// These don't work with FlowStacks:
.alert("Alert", isPresented: $isShowingAlert, actions: { ... })
.alert("Alert", isPresented: $isShowingAlert, presenting: details, actions: { ... })

// Only this deprecated API works:
.alert(isPresented: $isShowingAlert) {
    Alert(title: Text("Alert"), ...)
}

Environment:

• iOS version: iOS 26.0 (23A5308g)
• FlowStacks version: 0.8.4
• Xcode version: 26.0 beta 5 (17A5295f)

Workaround:
Using the deprecated Alert API which works correctly on all navigation levels.