Tell the editor to ask an administrator when the model does not exist

Problem/Motivation

With a model that does not exist, the editor reads "This could not be made. Try again." Retrying cannot help. A wrong key already shows "Generation is not available right now. Ask your site administrator."

Steps to reproduce

1. Set a model name that does not exist.
2. Generate.

Proposed resolution

Treat an unknown or rejected model as a configuration error and show the administrator message.

Generating with the model set to gpt-image-does-not-exist.

Before (1.0.x), the editor is told to try again:

After, the editor is told to ask the site administrator:

Before (1.0.x), the administrator gets the provider details only:

After, the administrator is told to check the model:

Remaining tasks

• ✅ File an issue
• ❌ Addition/Change/Update/Fix
• ❌ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ➖ Developer Documentation support
• ➖ User Guide Documentation support
• ➖ UX/UI designer responsibilities
• ➖ Accessibility and Readability
• ❌ Reviewed by a human
• ❌ Code review by maintainers
• ❌ Full testing and approval
• ❌ Credit contributors
• ❌ Review with the product owner
• ✅ Update Release Notes
• ✅ Release

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• N/A

AI-Generated: Yes