feat(data): settings.moderatorsPerDay in load/save JSON

js/data.js

@@ -1,3 +1,9 @@
+function parseSettings(raw) {
+  const n = raw?.moderatorsPerDay;
+  const valid = Number.isInteger(n) && n >= 1 && n <= 5;
+  return { moderatorsPerDay: valid ? n : 1 };
+}
+
 export function loadFromJSON(json) {
   let parsed;
   try {
@@ -16,7 +22,8 @@ export function loadFromJSON(json) {
           companyClosures: Array.isArray(parsed.calendar.companyClosures) ? parsed.calendar.companyClosures : []
         }
       : { holidays: [], companyClosures: [] },
-    history: Array.isArray(parsed.history) ? parsed.history : []
+    history: Array.isArray(parsed.history) ? parsed.history : [],
+    settings: parseSettings(parsed.settings)
   };
 }
 
@@ -24,7 +31,8 @@ export function saveToJSON(state) {
   return JSON.stringify({
     employees: state.employees,
     calendar: state.calendar,
-    history: state.history
+    history: state.history,
+    settings: state.settings
   }, null, 2);
 }