* docs: add device pairing section to Control UI docs
Explains that new browser connections require one-time pairing approval,
what error message users will see, and how to approve devices using the
CLI. This was a gap in the documentation that caused confusion for users
connecting via Tailscale Serve.
* docs: clarify Control UI pairing error
* docs: clarify device revoke flags
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Co-authored-by: Lucifer (via OpenClaw) <lucy@neuwirth.cc>
Co-authored-by: Sebastian <sebslight@gmail.com>
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