don't keep re-prompting the user to migrate if they get spontaneously logged out. (#5844)

ElementX/Sources/Application/AppCoordinator.swift

@@ -504,6 +504,11 @@ class AppCoordinator: AppCoordinatorProtocol, AuthenticationFlowCoordinatorDeleg
             appSettings.hasSeenNewSoundBanner = false
         }
         
+        if oldVersion < Version(26, 07, 3) {
+            MXLog.info("Migrating to version 26.07.3, marking the app as previously signed in.")
+            appSettings.hasSignedInBefore = true
+        }
+        
         userSessionMigrationsOldVersion = nil
     }
     

ElementX/Sources/Application/Settings/AppSettings.swift

@@ -293,6 +293,12 @@ final nonisolated class AppSettings: @unchecked Sendable {
     @UserPreference(defaultValue: AnalyticsConsentState.unknown)
     var analyticsConsentState: AnalyticsConsentState
     
+    /// Whether a user session has ever been set up on this device. Deliberately not cleared on
+    /// logout: it stops the Classic app migration prompt from reappearing when an Element X
+    /// user is signed out unexpectedly (invalidated token, corrupted storage, etc).
+    @UserPreference(defaultValue: false)
+    var hasSignedInBefore: Bool
+    
     @UserPreference(defaultValue: false)
     var hasRunNotificationPermissionsOnboarding: Bool