Purchase Orders: update order stage and show vendor + PO number in the 'at a glance' task list

When a Purchase Order is created for an order, two things should happen:

1. The PO should advance the matching workflow stage in the order's 'at a glance' task list. Example: creating a PO for the stone should turn the "Stone: Must Be Ordered" task into ordered.

2. In that same 'at a glance' area, each affected line should show which vendor the item was ordered from and the PO number, on the same line as the task. So the user can see, at a glance, that the stone was ordered, from which vendor, and under which PO number.

The PO ties to the client's name/listing in MonuDesk. Kim sees this as part of the order workflow tracking (Quote, Payment, Foundation, Stone, Design, Stencil, Engraving, Inspection, Installation). Context: Dennis mentioned this could fold into the audit trail feature currently in progress.