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/Controllers/ParentReportCardController.php

@@ -34,7 +34,7 @@ class ParentReportCardController extends BaseController
 
         $schoolYearContext = $this->resolveSchoolYearContext();
         $schoolYear = trim($schoolYearContext->yearName());
-        $semester = trim((string) ($this->request->getGet('semester') ?? $this->configModel->getConfig('semester') ?? ''));
+        $semester = trim((string) ($this->request->getGet('semester') ?? getSemester() ?? ''));
 
         $builder = $this->db->table('students s')
             ->select('s.id, s.firstname, s.lastname, cs.class_section_name')
@@ -89,7 +89,7 @@ class ParentReportCardController extends BaseController
 
         $schoolYearContext = $this->resolveSchoolYearContext();
         $schoolYear = trim($schoolYearContext->yearName());
-        $semester = trim((string) ($this->request->getGet('semester') ?? $this->configModel->getConfig('semester') ?? ''));
+        $semester = trim((string) ($this->request->getGet('semester') ?? getSemester() ?? ''));
 
         if (! $this->reportExists((int) $studentId, $schoolYear, $semester)) {
             return redirect()->to(site_url('parent/report-cards'))
@@ -142,7 +142,7 @@ class ParentReportCardController extends BaseController
         }
 
         $schoolYear = trim($schoolYearContext->yearName());
-        $semester = trim((string) ($this->configModel->getConfig('semester') ?? ''));
+        $semester = trim((string) (getSemester() ?? ''));
 
         if (! $this->reportExists((int) $studentId, $schoolYear, $semester)) {
             return redirect()->to(site_url('parent/report-cards'))