[Feature Request] Add an option of queue: images and prompts

Currently UI only allow to add single image and prompt and you need to wait for it to finish.
It would be great if you can add multiple images each one with a prompt, and it will run them one by one.
So you can leave the PC running with it.

Start by tracing the current UI flow for submitting one image and prompt and how generation completion is reported. Define the queue behavior, including multiple image/prompt pairs, sequential execution, progress, and completion or failure handling; done means users can submit a batch and it runs one item at a time without manual waiting.

Written by the indexing model from the issue text.