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/View/AdministratorController.php

@@ -76,7 +76,7 @@ class AdministratorController extends BaseController
         $this->classSectionModel = new ClassSectionModel();
         $this->adminNotificationSubjectModel = new AdminNotificationSubjectModel();
 
-        $this->semester = $this->configModel->getConfig('semester');
+        $this->semester = getSemester();
         $this->schoolYear = $this->configModel->getConfig('school_year');
         $this->studentClassModel = new StudentClassModel();
         $this->staffAttendanceModel = new StaffAttendanceModel();
@@ -701,7 +701,7 @@ class AdministratorController extends BaseController
 
     public function teacherSubmissionsReport()
     {
-        $semester = (string)($this->configModel->getConfig('semester') ?? $this->semester ?? '');
+        $semester = (string)(getSemester() ?? $this->semester ?? '');
         $schoolYear = trim((string) ($this->request->getGet('school_year') ?? ''));
         if ($schoolYear === '') {
             $schoolYear = $this->currentSchoolYearName((string) ($this->schoolYear ?? ''));
@@ -1106,7 +1106,7 @@ class AdministratorController extends BaseController
 
         $semesterResolver = new SemesterRangeService($this->configModel);
         $schoolYear = $this->currentSchoolYearName((string) ($this->schoolYear ?? ''));
-        $semester = (string)($this->configModel->getConfig('semester') ?? '');
+        $semester = (string)(getSemester() ?? '');
         $schoolYearForRange = $schoolYear !== '' ? $schoolYear : $this->currentSchoolYearName((string) ($this->schoolYear ?? ''));
         [$rangeStart, $rangeEnd] = $semesterResolver->getSchoolYearRange($schoolYearForRange);
         $semesterNorm = $semesterResolver->normalizeSemester($semester);
@@ -1224,7 +1224,7 @@ class AdministratorController extends BaseController
         if (!is_array($notify)) {
             return redirect()->back()->with('info', 'Select at least one teacher to notify.');
         }
-        $semester = (string)($this->configModel->getConfig('semester') ?? $this->semester ?? '');
+        $semester = (string)(getSemester() ?? $this->semester ?? '');
         $missingItemsPayload = $this->request->getPost('missing_items') ?? [];
         $homeworkNotifyAll = (bool) $this->request->getPost('homework_notify_all');
         $examTerm = $this->resolveExamTermLabel($semester);
@@ -3208,7 +3208,7 @@ class AdministratorController extends BaseController
                         'currency'           => 'USD',
                         'refund_paid_amount' => 0.0,
                         'status'             => 'Pending',
-                        'source_type'        => 'invoice_overpayment',
+                        'source_type'        => 'tuition_withdrawal',
                         'source_id'          => (int)$invoice['id'],
                         'requested_at'       => utc_now(),
                         'updated_by'         => session()->get('user_id') ?? null,