0308490aef
Resolves the remaining Minor items from the 2026-05-15 review so the web-UI dashboard work has no open follow-ups: a real-HubConnection end-to-end test for the SignalR feed, stable mbproxy.admin.broadcast.* log-event names, keyboard/aria accessibility on the fleet table, frontend JS hardening (URL-decode guard, NaN guards, shared util.js), reconciler<->capture-registry coverage, throwing-sink and embedded-asset tests, broadcaster polish, and a soft upper bound on AdminPushIntervalMs. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>