Add digitization section for the finding aid request form

[cbeer]

Browser view

• SW Single item
• SW Multiple item
• Finding aid single item
• Finding aid multi-item

Design with specifications

• SW single item
• SW multi-item
• Finding aid single-item
• Finding aid multi-item

Terms: https://www.figma.com/design/sqzYVhfRgn3nMArUAdrs0n/My-Account---Requests?node-id=2535-29184&t=XemTn9apAMy7u4Fo-4

Design notes

• If the user selects Digitization, a 4th step is added (Terms).
  • Ideally, it's appearance/disappearance should be a gentle transition.

Notice the interactions when there's multiple items (seen on browser view). When the user enters required info, the checkbox for done/complete is displayed. When the user clicks save on an individual item (for digitization), that item's accordion closes and the next one opens.

(Some, or all, of the searchworks digitization interaction may already be done in #2965)