[Feature]: Support PDF upload

[soufDev]

Before submitting

• I searched existing issues and did not find a duplicate.
• I am describing a concrete problem or use case, not just a vague idea.

Area

apps/desktop

Problem or use case

I want to be able to upload pdfs for now I can only upload images

Proposed solution

We just need to have the same behavior than uploading a picture same UX

Why this matters

because I want to upload PDFs when I need to so the coding agent can read

Smallest useful scope

upload a pdf file that can be read but the coding agent like it does with images

Alternatives considered

No response

Risks or tradeoffs

No response

Examples or references

No response

Contribution

• I would be open to helping implement this.

[sahzudin]

I think any of the common file types could be supported. I tried to upload log/txt file to agent for inspection, but it was not possible.