[feature] COPY the prefilled text field of a node into the text field, and make it editable instead of giving an EMPTY text field

### Is there an existing issue for this?

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

### What problem are you experiencing?

Too many models have similar names that differ with letters and it is annoying to re use other people workflow where I need to rewrite the whole model from 0 to try to explain my comfy where to find them

### When does this problem occur?

when i try to replace /correct model names/paths in nodes

### How often do you encounter this problem?

Daily

### How much does this problem affect your workflow?

Causes moderate inconvenience

### Current workarounds

Look at this example:

If I hadnot filtered with "LOW" I would had a list of 10 or models to choose from
The problem with long workflows , and even trying multiple workflows a day
it can get depressing to start filling the right model names (right path) if we dont have the same path as the one pre filled in said text field of the node.

### Ideas for solutions (Optional)

The solutions would be:
If I was able to edit directly this part :

I would be able to simply delete the word "KJ module" and instnalty the searcher would find the exact model of mine in my path.

Insted I have to write the whole model name (notice how they all start with same prefixes etc) sometimes its even confusing to separate between them.

### Additional context

_No response_

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-6165-feature-COPY-the-prefilled-text-field-of-a-node-into-the-text-field-and-make-it-edi-2926d73d365081989323d7e05e0c100d) by [Unito](https://www.unito.io)

No source files or tests are named; start by tracing the node model selector and its prefilled text field in the frontend. The work is done when the existing value is editable, users can remove part of it, and the model search filters the available choices accordingly.

Written by the indexing model from the issue text.