Map default instance swap content for icons

[nathanacurtis]

Problem

Icon names represented as instance swap props are not mapped as varying content. Unlike text characters, which are captured as default content that changes across variants, icon instance swap content is not treated the same way.

Solution

Map default instance swap content for icons as named content items in the default variant and across variants, following the same pattern used for text content.

Acceptance criteria

• Icon instance swap default content is captured as a named content item
• Icon content variations across variants are tracked like text variations

---

Implementation details are tracked internally.