Show QR code in terminal when sharing remote control session link

Feature request

When /remote-control generates a session sharing URL, automatically display a QR code in the terminal alongside the link.

Motivation

When you're already in an SSH session or terminal, scanning a QR code with your phone is much faster than manually typing or copying a long URL. The current flow requires you to copy the URL and open it separately.

Suggested behaviour

After printing the session URL, render it as an ASCII QR code directly in the terminal — the same output as qrencode -t ANSIUTF8 or the Python qrcode library's print_ascii(). No external dependencies needed if a small QR encoder is bundled.

Example output

Remote control session ready:
https://claude.ai/code/session_<redacted>

█▀▀▀▀▀▀▀███▀▀▀███▀█▀▀▀▀█▀██▀▀▀▀▀▀▀█
█ █▀▀▀█ █▀▄ ▄ █▀▄ ▄▄█▀▀▄█▄█ █▀▀▀█ █
...