## Summary
The version/commit badge currently rendered in the nav stats bar
(alongside packet counts, node counts, and observer counts) is
operator-facing diagnostic information — not something end users need
visible on every page load. For most visitors, it adds visual noise
without adding value.
## Changes
- **perf.js**: Add a **Version** card to the Perf dashboard overview
row. Shows `version` + short `commit` hash, both already available from
`/api/health` (no new API surface needed). Card renders conditionally —
if neither field is set it stays hidden.
- **app.js**: Remove `formatVersionBadge()` and `formatEngineBadge()`
helper functions (now unused); strip the badge call from
`updateNavStats()` so the navbar shows only packet/node/observer counts.
- **style.css**: Remove now-dead `.nav-stats .version-badge`,
`.nav-stats .engine-badge`, and their link sub-rules.
## Rationale
The Perf page is explicitly the right place for this information — it's
already scoped to operators and developers who want to know what version
is running. The navbar is a high-visibility surface shared by all users;
version strings belong in a diagnostic context, not a navigation bar.
Net result: navbar is cleaner for end users; operators can still find
version info immediately on the Perf tab.
Eric Muehlstein
788a509e73
