🚀 Feature: Updated UI/UX for "Upload new document" modal

[tenokami]

🔖 Feature description

https://www.figma.com/design/OXLtrl1EAy885to6S69554/DocsGPT?node-id=0-1&t=N50TV6CgjXioM0rQ-1

🎤 Why is this feature needed ?

Better UI/UX

✌️ How do you aim to achieve this?

Better UI/UX

🔄️ Additional Information

It might be optimal to work on this issue after https://github.com/arc53/DocsGPT/issues/1201 is completed because they share some similarities that can be reused.

👀 Have you spent some time to check if this feature request has been raised before?

• [X] I checked and didn't find similar issue

Are you willing to submit PR?

None