[VS Code] /rename doesn't repaint sidebar/tab until Developer: Reload Window + a click

Summary

In the Claude Code VS Code native extension, renaming a session via /rename succeeds at the data layer but the Session history sidebar entry and the tab title do not repaint until a Developer: Reload Window and a subsequent manual click. This makes it very hard to tell concurrent Claude windows apart, which defeats the purpose of naming them.

This is the same substance as #63465 ("Chat session rename doesn't update in sidebar until VS Code restarts"), which was closed as not planned / inactive rather than fixed — its closing comment invited a fresh issue if still relevant. It still is. Also related: #53942, #37628.

Steps to reproduce

1. In an active session, run /rename <new-name>. The command output confirms Session renamed to: <new-name> — the rename is applied at the data layer.
2. Observe the Session history sidebar entry and the tab title.

Expected

The sidebar entry and tab title update to <new-name> immediately on rename.

Actual

They keep showing the old auto-generated title. Specifically:

• Clicking to another session and back does not refresh the label.
• Collapsing/expanding the Session history panel does not refresh it.
• Only Developer: Reload Window refreshes it — and even then the label does not update until a session is clicked afterward.

The session-history list appears not to subscribe to rename events, and the post-reload render needs a focus/selection change to repaint.

Impact

Users running multiple concurrent Claude windows can't distinguish them by name until they reload the window and click around, which defeats the purpose of naming sessions. Current workaround is the full /rename → Reload Window → click-a-session dance.

Environment

• Claude Code VS Code native extension (sidebar Session history + tabs)
• macOS (darwin)