Global setting to keep guest messages running when a security deposit is pending

Add a global host setting so guest messaging workflows keep running whether or not the guest has completed the security deposit.

Currently, if a guest hasn't completed the security deposit in the guest portal, their scheduled messages stop until it's done. Those workflows carry essential arrival information such as door codes, backup codes and check-in instructions, so holding them back puts the guest's arrival and host’s reputation at risk.

Suggested setting: "Continue messaging workflows regardless of security deposit status" (on/off). Hosts who prefer the current behavior can leave it off.

Why it matters: last-minute guests often don't complete the deposit before arrival. We recently had a short-notice booking where our lock didn't program because of a network outage, and because the guest's messages had stopped, he never received his backup code. Together with guests who are uneasy paying in a separate portal, this has led us to switch security deposits off altogether. With this setting we would turn them back on.

Optional upsells already work without holding up messages, and security deposits should be able to work the same way.