[Feature Request]: UX - add a toggle in Queue Sidebar "Show only Saved images"

### Is there an existing issue for this?

- [x] I have searched the existing issues and checked the recent builds/commits

### What would your feature do ?

Allow us to not clutter the UI with potential irrelevant images (PreviewImage output), because the majority of time we care only to Saved Images (SaveImage output).

A toggle in the sidebar (checkbox/switch) can allow us to decide if we want to :
- see only Saved Images -> Toggler state ON
- see Saved Images + Preview Images + Text -> Toggle state OFF

### Proposed workflow

Irrelevant

### Additional information

The state of this toggle should be global, not linked to a queue item, so when we switch between expanded Queued Items View the toggle state is persisted.

If a checkbox in the sidebar UI will clutter the real estate, this toggle can be moved to Settings Modal.

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-4296-Feature-Request-UX-add-a-toggle-in-Queue-Sidebar-Show-only-Saved-images-2216d73d36508112b4a2f3f2af0b045f) by [Unito](https://www.unito.io)