[FEATURE] Possibility to add author.signature as image to be added above author's name in signature block.

[hitzemann]

I discovered typst and your modern-cv lib today. I found the need for adding my signature above my name in the signature block of the cover letter.
I tried adding a type check, but that broke adding the image.

[Copilot]

Pull Request Overview

Adds functionality to include an author's signature image in the cover letter signature block. The image appears above the author's name when the signature field is provided in the author object.

• Adds a new signature parameter to the function signature with type image
• Implements conditional rendering of the signature image in the signature block

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[ptsouchlos]

Just one comment - lmk your thoughts and thanks for the PR!

[hitzemann]

Looks all good to me, I think copilot was confused by "signature" being the name of the key in the object and the name of a function at the same time.

[ptsouchlos]

LGTM thanks again!