Change ResidentId(String) to ResidentId(u8), impl Copy for ShiftType, use u8 for all UserConfig params

src/routes/state.svelte.ts

@@ -2,7 +2,7 @@
 import { CalendarDate, getDayOfWeek } from "@internationalized/date";
 
 export interface Resident {
-  id: string;
+  id: number;
   name: string;
   negativeShifts: CalendarDate[];
   manualShifts: CalendarDate[];
@@ -12,12 +12,13 @@ export interface Resident {
 }
 
 export interface ForbiddenPair {
-  id1: string;
-  id2: string;
+  id1: number;
+  id2: number;
 }
 
 export class RotaState {
   currentStep = $state(1);
+  residentsCounter = $state(0);
   residents = $state<Resident[]>([]);
   selectedMonth = $state(2);
   selectedYear = $state(2026);
@@ -38,7 +39,7 @@ export class RotaState {
 
   addResident() {
     this.residents.push({
-      id: crypto.randomUUID(),
+      id: ++this.residentsCounter,
       name: "",
       negativeShifts: [],
       manualShifts: [],
@@ -48,11 +49,11 @@ export class RotaState {
     });
   }
 
-  removeResident(id: string) {
+  removeResident(id: number) {
     this.residents = this.residents.filter((r) => r.id !== id);
   }
 
-  findResident(id: string) {
+  findResident(id: number) {
     return this.residents.find((r) => r.id === id);
   }
 
@@ -102,11 +103,11 @@ export type UserConfigDTO = {
   year: number;
   holidays: Array<number>;
   residents: Array<ResidentDTO>;
-  toxic_pairs: Array<[string, string]>;
+  toxic_pairs: Array<[number, number]>;
 };
 
 export type ResidentDTO = {
-  id: string;
+  id: number;
   name: string;
   negativeShifts: Array<number>;
   manualShifts: Array<{ day: number; position: ShiftPosition }>;