[Mobile ] Before setting up a new wallet for the first time, warn the user if their disk space is below or near the needed threshold.

[dreacot]

A substantial amount of disk space is required for SPV mode. Before setting up a new wallet for the first time, warn the user if their disk space is below or near the needed threshold. Also check and warn if remaining disk space is critically low during subsequent app launches.

[ahmednajatusman]

Hh