overlay: tell the agent about a blocking password-manager prompt; chrome_clear_overlay closes it on request

Another extension's frame (1Password's inline prompt) makes Chrome refuse the
debugger on the tab. The old path sent Escape on its own, which cannot reach
that frame and would close a prompt the user may be using. Now nothing is closed
automatically: the error says what is blocking and tells the agent to ask the
user; chrome_clear_overlay removes the frame, blurs the field, sends Escape and
reports whether the tab is usable again.

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