fix(app): fix image dragging in project edit dialog

[albingroen]

Fixes #6699

Changes

• Check whether or not we have an active dialog when listening for drag events in the prompt input, and return early if that's the case.

Demo

Before

https://github.com/user-attachments/assets/9b65f984-1078-4731-b9f2-68d0ce46d87c

After

https://github.com/user-attachments/assets/e60586e4-ba83-4a78-bb5e-012ed5c9ffb8