[Feature]: Improve error when attempting to transfer from saving without confirmed onchain tx

[catch-21]

Describe the problem

When attempting to transfer from savings to spending where an unconformed input would be used the toast error message reads "node capacity reached". The cause is not obvious enough and the user experience could be better with a more specific message.

Describe the solution

Inform the user to wait for input confirmation before trying again.

Additional context

No response