Font schema needs a major cleanup

## What are the schemas that are affected by the issue

schemas/assets/font.schema.json

## What are examples of products that are impacted by the issue

Start by inspecting schemas/assets/font.schema.json and identify the schema definitions covered by the requested cleanup. Confirm the intended cleanup scope with project maintainers, then validate that the revised font schema remains valid and reflects the agreed changes.

Written by the indexing model from the issue text.