The banner sits in a single if-let slot; without an identity key, clearing a
tip that was covering a network/offline banner swapped content in place with
no transition (instantly vanishing). Keying the banner by its value (.id)
makes every change — tip→network or tip→nil — run the shared removal
transition, so the tip slides up and fades out when it auto-dismisses or is
tapped.
FuelBoard Contributor
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