feat(classes): add class days and meeting times to class forms

Let admins set the weekly schedule on the class and show it in lists, details, and session generation.

src/utils/classSchedule.js

@@ -0,0 +1,41 @@
+export const WEEKDAYS = [
+  { label: 'شنبه', value: 6 },
+  { label: 'یکشنبه', value: 0 },
+  { label: 'دوشنبه', value: 1 },
+  { label: 'سه‌شنبه', value: 2 },
+  { label: 'چهارشنبه', value: 3 },
+  { label: 'پنجشنبه', value: 4 },
+  { label: 'جمعه', value: 5 }
+];
+
+const IRAN_WEEK_ORDER = [6, 0, 1, 2, 3, 4, 5];
+const LABEL_BY_VALUE = Object.fromEntries(WEEKDAYS.map((day) => [day.value, day.label]));
+
+const joinFaList = (items) => {
+  if (!items.length) return '';
+  if (items.length === 1) return items[0];
+  if (items.length === 2) return `${items[0]} و ${items[1]}`;
+  return `${items.slice(0, -1).join('، ')} و ${items[items.length - 1]}`;
+};
+
+export function formatClassDays(days = []) {
+  const unique = [...new Set((days || []).map(Number).filter((day) => day >= 0 && day <= 6))];
+  unique.sort((a, b) => IRAN_WEEK_ORDER.indexOf(a) - IRAN_WEEK_ORDER.indexOf(b));
+  return joinFaList(unique.map((day) => LABEL_BY_VALUE[day]).filter(Boolean));
+}
+
+export function formatClassTime(startTime, endTime) {
+  const start = String(startTime || '').trim();
+  const end = String(endTime || '').trim();
+  if (!start && !end) return '';
+  if (!end) return start;
+  if (!start) return end;
+  return `${start} – ${end}`;
+}
+
+export function formatClassSchedule(cls) {
+  const days = formatClassDays(cls?.days);
+  const time = formatClassTime(cls?.startTime, cls?.endTime);
+  if (days && time) return `${days} | ${time}`;
+  return days || time || '';
+}