feat: import class sessions, attendance, and payments from JSON

Match students by name when national ID or phone is missing, parse Jalali dates, and allow sessions without a professor.

utils/jalaliDate.test.js

@@ -0,0 +1,18 @@
+'use strict';
+
+const { describe, it } = require('node:test');
+const assert = require('node:assert/strict');
+const { jalaliToGregorian, parseJalaliDate, parseImportDate } = require('./jalaliDate');
+
+describe('jalaliDate', () => {
+  it('converts تکسا attendance dates to Gregorian', () => {
+    assert.equal(jalaliToGregorian(1405, 4, 23), '2026-07-14');
+    assert.equal(parseJalaliDate('1405.4.28'), '2026-07-19');
+    assert.equal(parseJalaliDate('1405/5/20'), '2026-08-11');
+  });
+
+  it('parses ISO and jalali values into UTC midnight dates', () => {
+    assert.equal(parseImportDate('2026-07-14').toISOString(), '2026-07-14T00:00:00.000Z');
+    assert.equal(parseImportDate('1405.5.12').toISOString(), '2026-08-03T00:00:00.000Z');
+  });
+});