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.

components/dataImport/importHelpers.test.js

@@ -0,0 +1,51 @@
+'use strict';
+
+const { describe, it } = require('node:test');
+const assert = require('node:assert/strict');
+const {
+  normalizePersonName,
+  namesMatch,
+  normalizePhone,
+  mapAttendanceStatus,
+  projectSessionDates
+} = require('./importHelpers');
+
+describe('importHelpers', () => {
+  it('normalizes honorifics so spreadsheet names match database users', () => {
+    assert.equal(normalizePersonName('مریم خ پناهیان'), 'مریم پناهیان');
+    assert.ok(namesMatch('آقای رضایی', 'آقای رضایی'));
+    assert.equal(normalizePhone(9168942141), '09168942141');
+  });
+
+  it('maps spreadsheet attendance marks', () => {
+    assert.equal(mapAttendanceStatus('*'), 'present');
+    assert.equal(mapAttendanceStatus('غ'), 'absent');
+    assert.equal(mapAttendanceStatus(''), null);
+  });
+
+  it('projects remaining Teksa sessions from Sunday/Tuesday pattern', () => {
+    const firstNine = [
+      '2026-07-14',
+      '2026-07-19',
+      '2026-07-21',
+      '2026-07-26',
+      '2026-07-28',
+      '2026-08-02',
+      '2026-08-04',
+      '2026-08-09',
+      '2026-08-11'
+    ];
+    const all = projectSessionDates(firstNine, 16);
+    assert.equal(all.length, 16);
+    assert.deepEqual(all.slice(0, 9), firstNine);
+    assert.deepEqual(all.slice(9), [
+      '2026-08-16',
+      '2026-08-18',
+      '2026-08-23',
+      '2026-08-25',
+      '2026-08-30',
+      '2026-09-01',
+      '2026-09-06'
+    ]);
+  });
+});