fix(web): flip the sidebar's Don't ask toggle to Ask mode - #62

The footer toggle read "Don't ask" and turned orange when agents would not ask, which is the opposite of how the owner reads it.

• Footer: it now shows Ask mode. It's orange and on when agents may ask you questions, using the same MessageCircleQuestionIcon a thread shows while it waits on your answer. It's gray and off when agents decide without asking. The tooltip and accessible label describe both states.
• Settings: the shared settings row in General and Customizations reads Ask mode, with its switch inverted. Search finds it with "ask", "ask mode" or "don't ask".
• Unchanged: the stored dontAskMode setting and its effect on agents.

Closes #59

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