Fix semester context, attendance rosters, and billing workflows

- load global semester helpers consistently and use date-based semester defaults
- fix grading and daily attendance duplicate student/section rows
- keep attendance violations scoped to the current semester by default
- update invoice, refund, discount, payment, and financial aid flows
- add configuration cleanup migrations for duplicate calendar/semester keys
- refresh parent registration/report-card and print request handling
- update related models, services, views, cron notes, and test coverage

tests/app/Libraries/RefundEligibilityServiceTest.php

@@ -60,6 +60,20 @@ class RefundEligibilityServiceTest extends CIUnitTestCase
         $this->assertContains('HAS_APPROVED_RESERVATIONS', $result->reasonCodes);
     }
 
+    public function testTuitionWithdrawalAvailableCreditSubtractsCompletedPayoutsAndReservations(): void
+    {
+        $service = new RefundEligibilityServiceHarness(20000, 2500, 1500);
+
+        $result = $service->calculateAvailableCredit(10, 20, 'tuition_withdrawal', 20);
+
+        $this->assertSame(20000, $result->sourceCreditCents);
+        $this->assertSame(2500, $result->completedPayoutCents);
+        $this->assertSame(1500, $result->reservedAmountCents);
+        $this->assertSame(16000, $result->availableAmountCents);
+        $this->assertContains('HAS_COMPLETED_PAYOUTS', $result->reasonCodes);
+        $this->assertContains('HAS_APPROVED_RESERVATIONS', $result->reasonCodes);
+    }
+
     public function testValidateRejectsAmountAboveAvailableCredit(): void
     {
         $service = new RefundEligibilityServiceHarness(10000, 7000, 1000);