Fix stale iOS Live Activities after app exit

[Explainfuture]

Summary

• end terminal Live Activities when a UIScene session is discarded from the app switcher
• recover and end every ActivityKit activity instead of relying on an in-memory reference
• clear orphaned activities before new terminal sessions are registered after launch
• route bulk server deletion through ServersNotifier so connection sessions and Live Activities are cleaned up

Root cause

The iOS implementation kept only LiveActivityManager.current. That reference is lost when the process exits even though ActivityKit intentionally keeps the Live Activity alive. A later stop request therefore had no activity to end and updates could create duplicates.

The project also uses the UIScene lifecycle, where applicationWillTerminate is not a reliable callback for a user closing the app from the app switcher. In addition, the settings bulk-delete path removed storage entries directly and bypassed the session cleanup performed by ServersNotifier.delServer.

Impact

Closing ServerBox from the iOS app switcher or deleting the connected server no longer leaves a stale "Connected" Live Activity in the Dynamic Island. Interrupted prior runs are reconciled on the next launch.

Validation

• flutter analyze lib test
• flutter test (462 tests passed)
• git diff --check

An iOS/Xcode build was not available on the Windows development host.

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