Good job! Already tried the new version quickly.
Some comments;
- Delete mode moves renders to trashcan folder, but dropping renders into trashcan doesn't. Is this intentional?
- Main rendered images area already works better, but deleting items / resizing windows (not sure what I did) makes the list look like a jagged array. Some rows are full, others have some items. Is this intentional? Could it simply be a one continuous list, like with Grid Layout Group? I've done several UIs for my own little projects and it works great for lists like this.
- "Prompts are saved in the image's meta" - Great! BTW - simply drop your png to any text editor (like notepad++), and you'll see your stored prompt near the beginning of the file, even though most of the other stuff will be "garbage". Another way is to use some popular image viewer/file browser like XnView MP, it can show you the metadata, from Preview Image panel's Info tab, ExifTool (non-MP version doesn't have this feature AFAIK).