bug: Session detail page renders blank (React crash)

[cameronhotchkies]

What

Navigating to any session detail page (/sessions/:sessionId) results in a blank page — React's root element renders empty. This happens on all sessions regardless of state (active, completed).

The sessions list page (/) renders correctly, and the API returns valid data for the session, so this is a frontend rendering issue.

Reproduction

1. Open http://localhost:3000
2. Click any session name in the list
3. Page navigates to /sessions/<id> but renders only the header — main content area is empty

Notes

• Confirmed this is pre-existing (occurs on main without any working tree changes)
• No visible error overlay from Vite; React silently crashes
• TypeScript compilation (tsc --noEmit) passes cleanly

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