Feature Request

Display the currently active model name in the chat interface, so users know which model is responding.

Use Case

When using model fallbacks or switching models with /model, it's not immediately clear which model is currently active. This becomes confusing when:

• Automatic fallback occurs (see Bug: Unexpected model fallback after successful response #9549)
• Testing different local models
• Debugging response quality differences

Suggested Implementation

Options:

1. Show model name in message metadata/header
2. Add /model command without args to show current model (currently requires an argument)
3. System message when model changes (explicit or via fallback)

Context

During testing of local ollama models, the model silently switched from qwen3:32b to gpt-oss-agentic without any visible indicator in the chat. Only by inspecting session transcripts was the switch detectable.