feat(protocol-designer): magnetic block can be added to staging area slot

[jerader]

closes AUTH-978

Overview

Now you can add magnetic block to a staging area in both editing you deck setup and the onboarding flow

Test Plan and Hands on Testing

Test different combos in the onboarding flow to see that it correctly places staging area with the magnetic block
Test adding a magnetic block and staging area in deck setup

Changelog

• extend logic to accept magnetic block on a staging area
• add test coverage for available slots

Risk assessment

low

[ncdiehl11]

looking for designs here— do we intend to lump together mag block and staging area in the same deck fixture?

[jerader]

looking for designs here— do we intend to lump together mag block and staging area in the same deck fixture?

yup! @ncdiehl11 sorry here are the designs. realized my copy is a bit wrong. i'll update it. https://www.figma.com/design/WbkiUyU8VhtKz0JSuIFA45/Feature%3A-Protocol-Designer-Phase-1?node-id=6640-50018&t=2bfdm9pzLrJl2UkH-0

[ncdiehl11]

this works well. I'm not as familiar with the logic for determining available slots during protocol creation, but smoke tested without issue. I'm comfortable merging this