Chore: Updated resolvers from Class to ResolveFn

overlord/src/app/period/period.resolver.ts

@@ -0,0 +1,10 @@
+import { inject } from '@angular/core';
+import { ResolveFn } from '@angular/router';
+
+import { Period } from './period';
+import { PeriodService } from './period.service';
+
+export const periodResolver: ResolveFn<Period> = (route) => {
+  const id = route.paramMap.get('id');
+  return inject(PeriodService).get(id);
+};