Send shifts to be approved, and approve them

When a rule asks for an OK, the last step of Add shift says why and who gives it, and the button reads Send for approval. The shifts wait with an amber Waiting for OK tag; workers do not see them yet. Tap the shift to see each step: who approved and who it waits on (a reminder goes to them after a day).

The person who approves finds it in Requests → Shifts to approve: what, where, how many people and hours (and the cost, for people allowed to see pay), and why it needed an OK. Approve sends it to the next level, or, at the last one, sends the offers out by themselves and tells the maker. Send back asks for a reason; the maker fixes the shift and taps Send again.

A run of shifts is one card. Timesheets submitted for payroll wait there too, with Review it (and on the Timesheets tab).