refactor: maintain flat orders

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

@@ -13,6 +13,7 @@ const cachedRundownPlaceholder: Rundown = {
   id: 'default',
   title: '',
   order: [],
+  flatOrder: [],
   entries: {},
   revision: -1,
 };

apps/client/src/common/utils/__tests__/csv.test.ts

@@ -22,6 +22,7 @@ describe('aggregateRundowns()', () => {
         title: '',
         revision: 0,
         order: ['1', '2'],
+        flatOrder: ['1', '2'],
         entries: {
           '1': { id: '1' } as OntimeEntry,
           '2': { id: '2' } as OntimeEntry,
@@ -32,6 +33,7 @@ describe('aggregateRundowns()', () => {
         title: '',
         revision: 0,
         order: ['3', '4'],
+        flatOrder: ['3', '4'],
         entries: {
           '3': { id: '3' } as OntimeEntry,
           '4': { id: '4' } as OntimeEntry,