Fixes the wrong calculation for the BTC total when adding multiple line items, and adds integration tests to make sure something this facepalm-inducing doesn't happen again.
Other improvements:
Disable the "add" button on the budget overview, until a core contributor account is connected (so you don't notice after filling in the form and potentially have to do it again)
Automatically pre-select your own account as recipient, since it's the most likely one
Fixes the wrong calculation for the BTC total when adding multiple line items, and adds integration tests to make sure something this facepalm-inducing doesn't happen again.
Other improvements: