prosolis cb84e1d549 games: a news session that travels to the games box ...

preferred_username was being read from the ID token and thrown away after
serving as a display-name fallback. It is the whole identity story: MAS imports
it as the Matrix localpart, so it is also who the player is in the euro economy.
Keep it in the session, and derive @user:server from it.

The session cookie was host-only, so a sign-in on news never reached games.
Widen it with an opt-in web.auth.cookie_domain — but only the session cookie:
the OAuth round-trip cookie pairs with a redirect back to the host that started
the login and stays where it was set. And because the redirect must return to
that host, the redirect_uri is now derived per-request for hosts inside the
cookie domain, with the configured URL as the fallback for anything else — a
Host header we don't own is never echoed into a redirect.

2026-07-13 23:04:09 -07:00

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