Git commit message generator should display active AI model

[X2Borgo]

Body

What are you proposing?

Display the active AI model used for generating commit messages directly in the Git commit message UI.

Currently, Zed allows configuring a specific model for commit message generation via the commit_message_model setting, but the UI does not show which model is being used.

This feature would add a visible indicator (e.g. model name or provider) near the commit message generation area, similar to how the Agent panel shows the active model.

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Why does this matter?

Right now, there is no way to verify which model is generating commit messages without checking configuration files.

This creates a few problems:

• Lack of transparency when multiple models/providers are configured
• Difficulty debugging differences in generated commit messages
• No visibility into cost differences between models
• Inconsistent UX compared to the Agent panel, which clearly shows the active model

Making the model visible would improve clarity, trust, and consistency across Zed’s AI features.

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Are there any examples or context?

• In Zed’s Agent panel, the active model is clearly displayed and selectable
• Tools like VS Code (with Copilot/Chat extensions) and Cursor show the current model/provider in the UI
• Zed already supports setting a specific model via:

  "agent": {
    "commit_message_model": {
      "provider": "openai",
      "model": "gpt-4o-mini"
    }
  }