fix: refresh run details after durable events

[pppolf]

What

• refresh the exact authoritative Run detail query after durable Run events
• coalesce event bursts and exclude transient model.delta frames from detail refetches
• add focused hook coverage for refresh, burst coalescing, and delta exclusion

Why

The live event stream updated the Activity timeline but did not refresh GET /runs/{run_id}. A lifecycle change made by the CLI, wake worker, or another UI could therefore leave the header, composer, and control buttons on a stale Run status indefinitely because focus refetching is disabled.

Impact

Run-scoped controls converge on server-authoritative status after streamed or Desktop-polled durable events. The bounded delay avoids one detail request per event burst, and high-frequency model deltas remain excluded.

Checks

• npm test (56 files, 213 tests)
• npm run typecheck
• npm run check:api
• npm run build
• npm audit --audit-level=moderate
• git diff --check

All checks ran with Node 24.19.0. Vite retains the repository's existing large-chunk warning.