[Feature Request]: Enhancements in the Sidebar Model's thumbnails

### 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 ?

First of all, adding images to Sidebar's models, it's an amazing feature !

( We just need to add an image, with the same name, to the model's folder ! )


But we could have some improvements:

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1) **Increase image size in the Sideber**
I wouldn't mind if the vertical spacing is increased a bit, when a model has an image.
Maybe we could have an user setting to select the image size ?


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2) **Add images to replace folder icons**
I organise my loras, by creator and I have a folder for each one.
It would be nice to replace the folder icon with an image, because in the first level, I have mostly folders.

**E.g.:** here it would be more useful to have the Bytedance logo as the folder icon, instead of the models.
I tried adding an image named "ByteDance" to the folder ( and also to the level above ), but it does not work either way.


### Proposed workflow

.

### Additional information

_No response_

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-4562-Feature-Request-Enhancements-in-the-Sidebar-Model-s-thumbnails-23e6d73d36508196a90dd3ee42ee36fc) by [Unito](https://www.unito.io)