New session UI disappears when stored session list response is late #10578

Description

With many sessions (13k+), the stored session list retrieval is slower.

If you create a new session while that request is in-flight, the stale response replaces the store without the newly created session.

Since the session view uses <Show when={session()}> (index.tsx:962) where session() derives from sync.session.get(route.sessionID) (index.tsx:114), the active session becomes undefined and the entire UI disappears.

Plugins

@franlol/opencode-md-table-formatter, @tarquinen/opencode-smart-title, @tarquinen/opencode-dcp

OpenCode version

1.1.35

Steps to reproduce

1. Have many sessions (slower retrieval)
2. Create a new session while session list is being fetched
3. Stale response arrives → session store replaced → active session no longer in store → UI gone

Note: UI can reappear depending of if the conversation is in progress. It will still cause a "blink" in that case: the UI dissapear and re-appear like nothing happened.

Screenshot and/or share link

No response

Operating System

Ubuntu 24.03

Terminal

Zed editor