OpenAI API-Key for GPT4.5 forgotten when un-&re-pinning model

When managing pinned models, unpinning GPT-4.5 (which requires your own OpenAI API key) causes the key to be forgotten.

Error/Bug:

Re-pinning requires re-entering the API key.

Expected behaviour:

The API key should be remembered unless explicitly removed/cleared by the user.

To reproduce:

1. Pin GPT-4.5 and enter your API key.
2. Un-pin GPT-4.5.
3. Re-pin GPT-4.5. You are now required to re-enter the API key.

Notes:

Given the limited UI for API keys, this behavior might be intended. There doesn't appear to be a dedicated place to manage API keys (currently only for OpenAI).

So my suggestion is to either:

- Clarify the current behavior as "expected" in the documentation. Explain how to change/remove the API key when the user enters it in the text box.
- Add API-Key management to the Settings UI.