Why: T2 frontend of the inbox (D25): the inbox is the first tab with a live
pending count; card events (created/updated/status/resolved) upsert the
projection in real time; confirm-projection cards route clicks back to HITL
resolution (run resumes, server syncs both sides); other actions call the
cards API and append the server-persisted receipt into the timeline.
Evidence: tsc + build green; vitest 9/9; card state resets/refreshes on
conversation open and reconcile.
Impact: default right tab becomes 收件箱 (localStorage-persisted preference
still honored for existing users).
Refs: modules/documents docs/proposals/2026-09-30-ui-inbox-command-workspace.md
weichen