Improve loading skeletons and preserve active turn status

[badcuban]

Summary

• add mobile back navigation and a responsive, layout-matched loading skeleton to the Usage page
• keep usage statistics overflow-free across desktop and mobile widths
• add native-layout skeletons for slower-loading sidebar, command palette, file viewer, diagnostics, extensions, connected-device, and archive surfaces
• preserve active turn status when mid-turn assistant segments, diffs, and checkpoints complete

Why

The Usage page had no explicit mobile exit control and showed plain loading text while data loaded. Other slower surfaces had the same abrupt loading experience.

Separately, assistant item completion and checkpoint/diff events were being treated as authoritative turn completion. That could make an active response appear finished while provider activity was still continuing.

Implementation

• use bounded CSS-only shimmer animation with reduced-motion support
• render skeletons only for initial empty loads so background refreshes preserve existing content
• require producers to declare whether assistant/diff completion events actually complete the turn
• keep legacy replay safe by treating events associated with the active session turn as non-terminal
• separate checkpoint completion timestamps from turn completion timestamps with a database migration

Validation

• vp fmt
• vp lint
• vp run typecheck
• focused provider-ingestion, checkpoint, projection, projector, store, and migration tests
• full serialized web browser suite: 406/406 passed
• Usage browser suite: 8/8 passed
• live desktop and mobile preview checks for the Usage layout, skeleton, navigation, and horizontal overflow

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
threadlines	Skipped		Aug 12, 2026 2:03pm