fix(mobile): preserve queued terminal order events

[JasonTM17]

Summary

• keep a session-scoped terminal-order listener alive while active-order listeners rotate
• prevent queued terminal Realtime events from being lost behind a stale active-order snapshot
• cancel the persistent listener during logout/dispose teardown
• add deterministic race and logout regression coverage

Verification

• flutter analyze --no-pub
• flutter test --no-pub test/driver/driver_session_cleanup_test.dart --reporter compact (11/11)
• flutter test --no-pub --reporter compact (386/386)
• independent CK review: no blocker

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