Implement organization maker-checker workflows

src/app/tasks/maker-checker-entity-fetch.ts

@@ -16,6 +16,7 @@ import { RecurringDepositsService } from 'app/deposits/recurring-deposits/recurr
 import { SystemService } from 'app/system/system.service';
 import { AccountingService } from 'app/accounting/accounting.service';
 import { UsersService } from 'app/users/users.service';
+import { OrganizationService } from 'app/organization/organization.service';
 
 /**
  * The services a maker-checker review screen needs in order to read an entity's current state.
@@ -30,8 +31,17 @@ export interface EntityFetchServices {
   system: SystemService;
   accounting: AccountingService;
   users: UsersService;
+  organization: OrganizationService;
 }
 
+/**
+ * Entities with exactly one row in the whole tenant (a global settings screen, not a record with an
+ * id) - Working Days being the first. These commands carry no resourceId at all, so the normal
+ * "no id, no lookup" guard below is relaxed for exactly this set; every other entity's behavior is
+ * unchanged.
+ */
+const SINGLETON_ENTITIES: ReadonlySet<string> = new Set(['WORKINGDAYS']);
+
 /**
  * Maps a maker-checker `entityName` to the existing API that returns that entity as it stands today,
  * so an UPDATE can be shown as OLD -> NEW and a DELETE can show what is about to be removed.
@@ -66,7 +76,11 @@ const ENTITY_FETCHERS: Record<string, (id: string, s: EntityFetchServices) => Ob
   CLIENT: (id, s) => s.clients.getClientData(id, true),
   ROLE: (id, s) => s.system.getRole(id),
   USER: (id, s) => s.users.getUser(id),
-  GLACCOUNT: (id, s) => s.accounting.getGlAccount(id, true)
+  GLACCOUNT: (id, s) => s.accounting.getGlAccount(id, true),
+
+  // ---- Singleton settings screens ----------------------------------------------
+  // No resourceId - the command applies to the one Working Days row the tenant has.
+  WORKINGDAYS: (id, s) => s.organization.getWorkingDays()
 };
 
 /** Whether this screen can read the entity's current state, and therefore produce a real diff. */
@@ -83,11 +97,16 @@ export function fetchCurrentEntity(
   resourceId: string | number | undefined | null,
   services: EntityFetchServices
 ): Observable<any> | null {
-  const fetcher = ENTITY_FETCHERS[(entityName ?? '').toUpperCase()];
-  if (!fetcher || resourceId === null || resourceId === undefined || resourceId === '') {
+  const key = (entityName ?? '').toUpperCase();
+  const fetcher = ENTITY_FETCHERS[key];
+  if (!fetcher) {
     return null;
   }
-  return fetcher(String(resourceId), services);
+  const hasResourceId = resourceId !== null && resourceId !== undefined && resourceId !== '';
+  if (!hasResourceId && !SINGLETON_ENTITIES.has(key)) {
+    return null;
+  }
+  return fetcher(String(resourceId ?? ''), services);
 }
 
 /**