Remote Control / session-sharing broken: disconnect crash, toggle failure, blank open-in-browser page

Three distinct, reproducible failures in the same feature area (Remote Control / session sharing) in one session.

1. Disconnecting Remote Control throws:

Remote Control failed to disconnect: Cannot read properties of undefined (reading 'session_url')

2. Toggling Remote Control off then fails outright:

Couldn't toggle Remote Control. Try again.

(Retried multiple times, same result each time.)

3. The session's own "Open in browser" link renders a completely blank page — no content, no error, no spinner:

claude.ai/code/session_01Y6vymtcDXZwcYBt7for2ga?open_in_browser=1

Context: Remote Control was already on for this session. Attempting to turn it off via the in-app toggle triggered #1. Retrying the toggle after that produced #2. Opening the session's own share link in a separate browser tab (to work around 1/2) produced #3 — tried in a normal window; a private/incognito window was not yet tested at time of filing.

All three point at the same underlying session-sharing/remote-control subsystem being broken, not three unrelated issues.