A failed MAC check (key/ciphertext divergence: restored backup,
clobbered prefs, racing key generation across isolates) threw from
CredentialVault.reveal on the startup profile-settings path and
crash-looped the app until data was wiped — one device logged 31
fatals in 16 minutes on 2.8.0.
Decrypt failure now means the credential is lost, never a crash:
reveal() returns null, ProfileConnectionRegistry maps it onto the
existing empty-token lazy-fetch sentinel and heals the row so later
boots re-acquire the token instead of re-failing, and
revealConnectionConfig degrades tokens to empty strings without
marking them migrated. Key init also reloads prefs before deciding to
generate and re-reads after writing, adopting whatever landed so all
isolates converge on a single key instead of orphaning ciphertext.
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