feat(report): persistent show run history

Turns the reporter from a live-only, single-run curiosity into a
persistent, per-project, per-rundown history of runs.

- Extend OntimeEventReport with a schedule snapshot (scheduledStart,
  scheduledDuration) taken when an event starts, plus playCount. Reports
  are now a record that survives later rundown edits, rather than a live
  join against the current rundown.
- Add a run lifecycle: a run opens on the first event start and closes on
  a full stop, archiving the previous run to history so the next start
  begins fresh.
- Persist runs to a per-project sidecar file (services/report-service),
  patterned on the existing restore-service, so a crash or restart no
  longer loses the whole show's record. Runs are scoped by rundownId for
  multi-rundown projects, cascade-deleted with their rundown or project,
  renamed alongside a project rename, and deliberately not copied when a
  project is duplicated.
- Extract the over/under/on-time variance and run summary maths shared by
  the rundown chip, the report settings panel, and the server into
  ontime-utils (getEventVariance, getRunSummary, countPlannedEvents).
- Extend the report API with run history endpoints (list, get, latest,
  rename, delete) while keeping GET /report's existing shape so Companion
  and HTTP automations are unaffected.
- Replace the settings report table with a run browser: a list of runs
  with a rundown filter, inline rename, delete, and a detail view with
  per-run summary stats and CSV export.
- Add a third, muted state to the rundown event chip: an event with
  nothing in the current run yet previews how it went last time.

Fixes a real bug found while testing the new store: emptyStore() was a
shared object, so its runs array leaked mutations across project loads.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019nr3FbLbM8gB8Jm771YgTV

apps/client/src/common/hooks-query/useProjectRundowns.ts

@@ -26,6 +26,16 @@ export function useProjectRundowns() {
   return { data: data ?? { loaded: '', rundowns: [] }, status, isError, refetch, isFetching };
 }
 
+/**
+ * The id of the currently loaded rundown, or null if none is loaded yet.
+ * Reads from the same lightweight summary query as `useProjectRundowns`, so
+ * consumers that only need the id are not subscribed to full rundown entries.
+ */
+export function useLoadedRundownId(): string | null {
+  const { data } = useProjectRundowns();
+  return data.loaded || null;
+}
+
 export function useMutateProjectRundowns() {
   const ontimeQueryClient = useQueryClient();