fix(ui): payment due date calculation, datepicker colors, scrollable tabs, optional receipt, default today date

src/utils/classSchedule.js

@@ -82,3 +82,38 @@ export function calculateClassEndDate(startDate, days = [], numberOfSessions = 0
 
   return lastMatchingDate ? lastMatchingDate.locale('fa').format('jYYYY/jMM/jDD') : '';
 }
+
+/**
+ * Calculates the halfway due date for a class in Jalali (jYYYY/jMM/jDD).
+ * If class has 10 sessions, due date is calculated until the 5th session.
+ * @param {Object} cls - Class object
+ * @returns {string} Jalali formatted date string, or today's date if not calculable
+ */
+export function calculateClassMidDate(cls) {
+  if (!cls) return moment().locale('fa').format('jYYYY/jMM/jDD');
+
+  const totalSessions = parseInt(cls.numberOfSessions || cls.course?.sectionCount || 0, 10);
+  const midSessions = totalSessions > 0 ? Math.ceil(totalSessions / 2) : 0;
+
+  if (cls.startDate && Array.isArray(cls.days) && cls.days.length > 0 && midSessions >= 1) {
+    const computed = calculateClassEndDate(cls.startDate, cls.days, midSessions);
+    if (computed) return computed;
+  }
+
+  if (cls.startDate && cls.endDate) {
+    const startM = moment(cls.startDate);
+    const endM = moment(cls.endDate);
+    if (startM.isValid() && endM.isValid()) {
+      const midTime = startM.valueOf() + (endM.valueOf() - startM.valueOf()) / 2;
+      return moment(midTime).locale('fa').format('jYYYY/jMM/jDD');
+    }
+  }
+
+  if (cls.startDate) {
+    const startM = moment(cls.startDate);
+    if (startM.isValid()) return startM.locale('fa').format('jYYYY/jMM/jDD');
+  }
+
+  return moment().locale('fa').format('jYYYY/jMM/jDD');
+}
+