The engine Model field is now an editable combo with a type-to-search
EntryCompletion (substring match). When you enter a remote engine URL it fetches
the model list from {url}/models (OpenAI `data[].id` or Ollama `models[].name`)
and fills the dropdown; local STT offers the whisper sizes. stt.list_models
added; tested live (8010 -> 428 models, 28080 -> 18, 19001 -> 1). You can still
type a custom model name.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>