Brainstormed design covering UX revamp of all four in-vault admin
panes (Settings, Devices, Trash, History) to match the fullscreen
visual language. Closes functional gaps along the way: per-device
session-timeout UI, revoke button surfacing, SHA256 fingerprint +
added-by display, per-item purge countdown, and a new history
index pane.
Item history uses option A (aggregate existing field_history per
item) — no new core storage, no schema change. Ships in v0.5.x
inside the current vault.ts shell; Phase 3 shell rearchitecture and
Phase 4 command palette deferred to their own rounds.
Roadmap entry reconciled to point at the spec.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
