Persist transcript usage through session history so reopened desktop tabs can restore header token counts, and resume elapsed timers when reconnected sessions report active status.
Tested: cd desktop && bun run test -- --run src/stores/chatStore.test.ts
Tested: bun test src/server/__tests__/sessions.test.ts
Tested: cd desktop && bun run lint
Tested: bun run check:server
Tested: git diff --check
Not-tested: bun run verify and coverage; scoped local handoff, not PR-ready validation.
Confidence: high
Scope-risk: narrow
572eba46f4