[bug] Zen login fails: "No authorization code found" / Failed query: update user set account_id

Description

Body:

Description

Signing in to OpenCode Zen fails with both GitHub and Google OAuth. The browser returns:

{"error":"No authorization code found.","cause":{"error":"server_error","error_description":"Failed query: update user set account_id = ?, email = ? where user.email = ?\nparams: acc_01KZ35Q9AR9BDEZX1MFJGQ9NNS,,sanjaykanna75@gmail.com"}}

The OAuth callback returns no code, then the server tries to update the user record with an empty email, which fails. The Zen API key cannot be created, blocking all Zen access.

Repro steps

1. Go to https://opencode.ai/auth
2. Click GitHub (or Google)
3. Authorize
4. Browser shows the JSON error above

Tried in incognito and after clearing cookies; both providers fail. New-account signup path appears affected too.

Plugins

No response

OpenCode version

OpenCode 1.18.11

Steps to reproduce

No response

Screenshot and/or share link

No response

Operating System

windows 11

Terminal

No response