Include model info in chat input aria label

[Copilot]

Improves accessibility by including the current language model name in the chat input's aria-label, helping screen reader users understand which AI model they're interacting with.

Changes

Modified src/vs/workbench/contrib/chat/browser/chatInputPart.ts:

1. Updated _getAriaLabel() method to extract and include the current language model name

   • Retrieves model name from this._currentLanguageModel?.metadata.name
   • Creates localized string: "Using {modelName}. "
   • Integrates model info into all aria-label variants (verbose/non-verbose)

2. Added aria-label refresh on model change

   • Updates input editor's aria-label when _onDidChangeCurrentLanguageModel event fires
   • Ensures screen readers immediately announce model changes

Example

Before:

"Chat Input (Agent), edit files in your workspace."

After:

"Chat Input Using GPT-4. (Agent), edit files in your workspace."

When no model is selected:

"Chat Input (Agent), edit files in your workspace."

(Falls back gracefully to original behavior)

Accessibility Impact

Screen reader users now receive:

• Clear indication of which AI model is currently active
• Immediate notification when switching models
• Complete context including model, chat mode, and help information

cc @jooyoungseo

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Include model info in chat input aria label</issue_title>
<issue_description>cc @jooyoungseo</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Include model info in chat input aria label #273159

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[Copilot]

Pull Request Overview

This PR enhances accessibility by including the current language model name in the chat input's aria-label, helping screen reader users understand which AI model they're interacting with.

Key Changes:

• Updated the _getAriaLabel() method to extract and include the current language model name in all aria-label variants
• Added automatic aria-label refresh when the language model changes via the _onDidChangeCurrentLanguageModel event listener