added cache system

frontend/js/team-calendar.js

@@ -82,15 +82,14 @@ async function loadOffices() {
         if (currentUser.role === 'employee') return;
     }
 
-    const response = await api.get('/api/offices');
+    // Cache offices list
+    const response = await api.getCached('/api/offices', 60);
     if (response && response.ok) {
         offices = await response.json();
 
         let filteredOffices = offices;
         if (currentUser.role === 'manager') {
             // Manager only sees their own office in the filter?
-            // Actually managers might want to filter if they (hypothetically) managed multiple, 
-            // but currently User has 1 office.
             if (currentUser.office_id) {
                 filteredOffices = offices.filter(o => o.id === currentUser.office_id);
             } else {
@@ -254,8 +253,8 @@ async function loadClosingData() {
     const promises = officeIdsToLoad.map(async (oid) => {
         try {
             const [weeklyRes, specificRes] = await Promise.all([
-                api.get(`/api/offices/${oid}/weekly-closing-days`),
-                api.get(`/api/offices/${oid}/closing-days`)
+                api.getCached(`/api/offices/${oid}/weekly-closing-days`, 60),
+                api.getCached(`/api/offices/${oid}/closing-days`, 60)
             ]);
 
             officeClosingRules[oid] = { weekly: [], specific: [] };