[Feature request] Add optional annotation metadata (authors, timestamps) to Details

### Description

When more than one person is annotating a design file, it's not always clear who annotated what. Figma doesn't offer metadata for when layers or component instances were added or modified on the canvas, which makes it hard to track annotation history.

### Requested change

Add optional metadata fields to annotations, such as:

- **Author:** The name or handle of the person who created the annotation
- **Date/time:** When the annotation was added or last updated

### Open questions

- Should this be added directly to Details annotations (alongside existing fields like documentation links), or as a separate lightweight utility component?
- Would adding more properties to already property-heavy Details annotations be too much? A standalone summary utility might be a cleaner approach.
- This could also be set up as a sub-component on the "Customize this kit" page, so teams can opt into it without it being enabled by default.