The bell is already gated on settings.reminder_channel === 'email', but
the check only ran at email-library init — so switching the reminder
channel in Settings didn't update the bell until you reopened Email.
- Settings/Reminders channel-change handler now dispatches
odysseus-reminder-channel-changed { channel } after saving.
- emailLibrary listens for it and re-runs _syncEmailReminderBellVisibility
with the new channel value.
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