trace-viewer: Support string span ids in nextjs trace backend (#95515)
The vercel CLI's trace format is 99% the same as the Next.js
`.next/trace` format. Except that it's using UUID as span ids, instead
of numbers.
1. Run `pnpm next internal trace
.vercel/output/diagnostics/cli_traces.json`
2. Profit
<img width="1434" height="265" alt="Bildschirmfoto 2026-07-06 um 15 23
02"
src="https://github.com/user-attachments/assets/b1cc0a8d-a1d3-4135-884b-e3050514853f"
/>