Display completed request output speed in the usage records table while keeping active requests focused on first-byte latency and live total duration.
The visible table keeps the compact tps label, while the tooltip expands the same value as tokens/s alongside first-byte, total, and generation durations.
Constraint: Synced against aether-rust-pioneer at 77c04749 with no upstream diff
Confidence: high
Scope-risk: narrow
Tested: npm run test:run -- src/features/usage/components/__tests__/UsageRecordsTable.spec.ts src/features/usage/__tests__/performance.spec.ts
Tested: npm run type-check
Tested: npm run build
Not-tested: Full backend test suite
fawney19