Fix iOS 18 startup crash by migrating to UIScene APIs#1
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Migrate from deprecated UIApplication window access patterns to iOS 13+ UIScene-based APIs. This fixes crashes on iOS 18 where Flutter 3.38's UIScene lifecycle changes cause the old APIs to return nil. Changes: - Add getRootViewController() helper using connectedScenes API - Use lazy root view controller fetching instead of at registration time - Update openContactForm(), cancelContactForm(), openExistingContact(), and openDeviceContactPicker() to use the new helper - Replace keyWindow?.frame with UIScreen.main.bounds Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
UIApplication.shared.delegate?.windowandUIApplication.shared.keyWindowAPIs returningnildue to Flutter 3.38's UIScene lifecycle changesgetRootViewController()helper using iOS 13+UIApplication.shared.connectedScenesAPI with fallback for older versionsTest plan
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