Custom footers registered via ctx.ui.setFooter(...) whose render()
closure touched ctx would crash pi on /quit: runtimeHost.dispose()
invalidates the extension runner before the TUI stops rendering, so
any still-attached footer render tick hit assertActive() and threw.
Call resetExtensionUI() before runtimeHost.dispose() in the interactive
shutdown path, matching the rebindCurrentSession() pattern. This
disposes the custom footer (clearing its interval) and detaches it
from the TUI tree before the runner goes stale.
closes#3595
Co-authored-by: Mario Zechner <badlogicgames@gmail.com>
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