Accessibility: Add verbosity setting, aria label hint, and keyboard shortcut to focus terminal from question carousel

[meganrogge]

Feature Request

When the askQuestions tool renders a question carousel triggered by a terminal interaction, users need accessible ways to navigate back to the terminal. Currently the "Focus Terminal" button is click-only with no keyboard shortcut, no keybinding hint in the aria label, and no verbosity setting to control the hint.

Proposed Changes

1. Verbosity setting

Add accessibility.verbosity.chatQuestionCarousel (boolean, default true) to control whether the carousel's aria label includes navigation hints (e.g., how to focus the terminal).

2. Keyboard shortcut

Register a new action workbench.action.chat.focusQuestionCarouselTerminal with keybinding Alt+T, scoped to:

• inChatQuestionCarousel
• chatHasQuestionCarousel
• chatQuestionCarouselHasTerminal (new context key, set when the carousel has a terminalId)

This ensures the keybinding only activates when there's actually a terminal to focus.

3. Aria label with keybinding hint

• The Focus Terminal button's aria-label should include the keybinding: e.g., "Focus Terminal (Alt+T)"
• When verbosity is enabled and the carousel has a terminal, _updateAriaLabel() should append a hint: "Use Alt+T to focus the terminal."

[anthonykim1]

@meganrogge Should alt/option + T navigate to focus terminal in the above case?

[meganrogge]

@anthonykim1 where is your focus in the above? Focus must be in the questions carousel for it to work.