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96824e455e
Address potential memory leaks and state-after-dispose issues: - AppProvider: Add dispose method to clean up listeners and callbacks - MapTab: Store and restore original location callback instead of nullifying - MessagesTab: Use Timer instead of Future.delayed for highlight cleanup - ConnectionDialog: Use named listener method for proper tab controller cleanup - RoomLoginSheet: Add _isDisposed flag to handle async callback race conditions - SettingsScreen: Clear location service callbacks in dispose - Various screens: Add mounted checks before setState after async operations (contacts_tab, device_config, home_screen, map_management, packet_log, sar_template_management, sar_update_sheet, permission_request_dialog)