Persist versioned models and validated network metadata in IndexedDB. Show scene download progress and recoverable errors with the existing frosted material.
Connect existing skeletons to pending navigation and route boundaries while preserving the map. Previously only dynamic imports showed fallbacks, and rejected model promises prevented retries.
Verified: 32 focused unit tests; 4 navigation and scene browser checks; 7 cache browser checks including invalid-metadata recovery; isolated production build and type checks.
The scene previously returned early when realtime rows were absent and selected map-tier assets for network mode, hiding SCADA markers and station interiors and floors.
Use SCADA timestamps as valid frames, render node-aligned monitor markers, and pin the full network context in the manifest regression test. Keep the timeline close action inside its drag header.