Show how many characters are left in the description

Problem/Motivation

The description limit is only the browser maxlength. Text past it is cut silently.

Steps to reproduce

1. Paste a text longer than the limit into the description.

Proposed resolution

Show a live "N characters left" counter, announced politely near the limit, and check the length on the server with a field error.

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): no character counter under the description.
  
• After: "N characters left" under the description.
  

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• N/A

AI-Generated: Yes