Improve embeddings / vector search story in Studio

We can display the embeddings in your table in Studio today, but there are some things we can improve:

- [ ] Better handling of display of the massive arrays in the UI
- [ ] Allow forming embeddings to actually search by them, assuming we know the model and can reach it, if we have the work set forth in https://github.com/HarperFast/harper/issues/510 available
- [ ] Once we do search, we can display relevance / similarity when displaying search results in some nice way

The issue names no files or tests. Start by locating the existing embedding display in Studio and read the linked Harper issue 510; done would mean making large arrays usable, enabling embedding-based search when the model is reachable, and showing relevance or similarity in results.

Written by the indexing model from the issue text.