fix: resolve course/class fields, surname i18n, optional nationalId, auto class end date, login styling, and mobile sidebar navigation

src/utils/classSchedule.js

@@ -1,3 +1,5 @@
+import moment from 'jalali-moment';
+
 export const WEEKDAYS = [
   { label: 'شنبه', value: 6 },
   { label: 'یکشنبه', value: 0 },
@@ -39,3 +41,44 @@ export function formatClassSchedule(cls) {
   if (days && time) return `${days} | ${time}`;
   return days || time || '';
 }
+
+/**
+ * Calculates the class end date in Jalali (jYYYY/jMM/jDD) based on start date, selected days, and number of sessions.
+ * @param {string|Date} startDate - Jalali string (e.g. 1403/01/01) or ISO string / Date
+ * @param {number[]} days - Array of weekday indexes (0=Sun, 1=Mon, ..., 6=Sat)
+ * @param {number} numberOfSessions - Total number of sessions
+ * @returns {string} Jalali formatted date string, or empty string if not calculable
+ */
+export function calculateClassEndDate(startDate, days = [], numberOfSessions = 0) {
+  const countNeeded = parseInt(numberOfSessions, 10);
+  if (!startDate || isNaN(countNeeded) || countNeeded < 1) return '';
+
+  const validDays = Array.isArray(days)
+    ? [...new Set(days.map(Number).filter((d) => d >= 0 && d <= 6))]
+    : [];
+  if (!validDays.length) return '';
+
+  const latinStartDate = String(startDate)
+    .replace(/[۰-۹]/g, (d) => '۰۱۲۳۴۵۶۷۸۹'.indexOf(d))
+    .replace(/[٠-٩]/g, (d) => '٠١٢٣٤٥٦٧٨٩'.indexOf(d))
+    .trim();
+
+  let current = moment(latinStartDate, ['jYYYY/jMM/jDD', 'YYYY-MM-DD', 'YYYY/MM/DD', moment.ISO_8601]);
+  if (!current.isValid()) return '';
+
+  let count = 0;
+  let lastMatchingDate = null;
+  let safetyLimit = 365 * 5;
+
+  while (count < countNeeded && safetyLimit > 0) {
+    safetyLimit--;
+    if (validDays.includes(current.day())) {
+      count++;
+      lastMatchingDate = current.clone();
+    }
+    if (count >= countNeeded) break;
+    current.add(1, 'day');
+  }
+
+  return lastMatchingDate ? lastMatchingDate.locale('fa').format('jYYYY/jMM/jDD') : '';
+}