Describe the bug

After upgrading to OpenCode 1.2.21, the Web UI no longer shows sessions when I open it from my workspace root directory on Windows.

In that directory context, the sidebar is effectively empty: the expected session list is missing, and the usual New Session action is also not shown.

This worked before the upgrade.

To reproduce

1. Use a workspace root directory on Windows that already has historical OpenCode sessions.
2. Start opencode web from that workspace root.
3. Open the Web UI.
4. Enter that workspace-root context.

Expected behavior

The sidebar should either:

• show the existing root sessions for that directory, or
• show a normal empty state with a visible New Session action.

Actual behavior

• The sidebar does not show the expected session list.
• The New Session action is also missing in that context.
• The rest of the page still renders.

Environment

• OpenCode: 1.2.21
• Also reproducible on: 1.2.22
• OS: Windows
• Launch directory pattern: E:\AI\...\Opencode\workspace
• Local Web UI: http://127.0.0.1:4096

Additional context

I checked the local database and the sessions still exist.

• SQLite integrity check returns ok
• The workspace root still has about 30 sessions in the database
• 16 of them are root sessions (parent_id IS NULL)
• But the Web API call below returns an empty list for the same directory:
  • GET /session?directory=<workspace_root>&roots=true&limit=55
  • response: []

This looks like a regression in session scoping/filtering rather than database corruption.

It may be related to older sessions under the workspace root being associated with project_id = global and no longer being returned by the Web UI query after the upgrade.

This may also be related to #14570, but in my case it is consistently reproducible from a workspace-root launch on Windows.