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

app/Libraries/RefundEligibilityService.php

@@ -164,6 +164,7 @@ class RefundEligibilityService
     {
         return match ($sourceType) {
             'invoice_overpayment' => $this->invoiceCreditCents($parentId, $invoiceId ?: $sourceId),
+            'tuition_withdrawal' => $this->invoicePaidCents($parentId, $invoiceId ?: $sourceId),
             'payment_duplicate', 'payment_correction' => $this->paymentCreditCents($parentId, $invoiceId, $sourceId),
             'credit_memo', 'administrative_credit' => 0,
             default => 0,
@@ -175,6 +176,22 @@ class RefundEligibilityService
         return $sourceType !== 'invoice_overpayment';
     }
 
+    protected function invoicePaidCents(int $parentId, int $invoiceId): int
+    {
+        if ($invoiceId <= 0) {
+            return 0;
+        }
+
+        $invoice = $this->invoiceModel->find($invoiceId);
+        if (!$invoice || (int)($invoice['parent_id'] ?? 0) !== $parentId) {
+            return 0;
+        }
+
+        $ledger = $this->invoiceLedgerService->calculateInvoice($invoiceId);
+
+        return max(0, (int)($ledger['paidCents'] ?? 0));
+    }
+
     protected function invoiceCreditCents(int $parentId, int $invoiceId): int
     {
         if ($invoiceId <= 0) {