Show AI status indicator next to the Generate button

Ricardo Castañedarequested to merge
issue/ai_ckeditor-3614074:3614074-show-ai-status into 1.x

The AI Writer status was only shown below the response editor, requiring a scroll to see it inside the modal right after clicking Generate. Mirror the same status text into a compact indicator next to the button so users get immediate feedback that the request is in progress.

Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com

Closes #3614074

Merge request reports