Names which of the two slots a card actually reads and writes right now, at
the card an operator types into (not only the page-top badge) — save() and
render() resolve without a mode argument, so the card looked identical in
both modes while quietly acting on whichever slot was active. Also adds the
ConfirmSwitchMode coverage IntegrationsPageTest already carries for
ConfirmSaveSecret/ConfirmForgetSecret: a modal is reachable without the
page's route middleware, and reading the code is not the same as testing it.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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