Refuse a description with no letters or digits before calling the provider

Problem/Motivation

A description made only of symbols, such as "!!! ***", is sent to the provider. That is a paid request, and the model invents a subject.

Steps to reproduce

1. Enter !!! *** as the description.
2. Click Generate.

Proposed resolution

Refuse a description with no letter or digit in any script (\p{L}\p{N}) with a field error, before any request.

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

• Before (1.0.x): a description of only symbols is sent to the provider.
  
• After: "Enter words, not only symbols." under the field, and no request.
  

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• N/A

AI-Generated: Yes