Ask anon AI tab: preserve on failure

AskCommands.ChatGpt and AskCommands.Claude must gate cdp.TryCloseAnonymousTabAsync() on ok=true. On ask failure (ok=false), the anonymous AI tab MUST stay open so the user can log in or inspect the failed page. Gemini's AskCommands.Gemini.cs uses inverted convention (if (!ok)) for a different reason and is intentionally untouched.

Steps