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/AttendanceController.php

@@ -63,7 +63,7 @@ class AttendanceController extends Controller
         $this->calendarModel       = model(CalendarModel::class); 
         $this->userRoleModel       = new UserRoleModel();
         $this->semesterScoreService = service('semesterScoreService');
-        $this->semester = $this->configModel->getConfig('semester');
+        $this->semester = getSemester();
         $this->schoolYear = $this->currentSchoolYearName();
         $this->enableAttendance = $this->configModel->getConfig('enable_attendance');
         $this->semesterRangeService = new SemesterRangeService($this->configModel);
@@ -534,19 +534,19 @@ public function showUpdateAttendanceForm()
         // If there are no assignments yet for the requested semester (e.g., Spring roster not populated),
         // fall back to the school year only so the roster still renders and can be used for the new term.
         $classSections = $this->classSectionModel
-            ->select('classSection.id, classSection.class_id, classSection.class_section_id, classSection.class_section_name')
+            ->select('MIN(classSection.id) AS id, classSection.class_id, classSection.class_section_id, classSection.class_section_name', false)
             ->join('student_class sc', 'sc.class_section_id = classSection.class_section_id', 'inner')
             ->where('sc.school_year', $termYear)
-            ->groupBy(['classSection.id', 'classSection.class_id', 'classSection.class_section_id', 'classSection.class_section_name'])
+            ->groupBy(['classSection.class_id', 'classSection.class_section_id', 'classSection.class_section_name'])
             ->findAll();
 
         $useRosterFallback = false;
         if (empty($classSections) && $termYear !== '') {
             $classSections = $this->classSectionModel
-                ->select('classSection.id, classSection.class_id, classSection.class_section_id, classSection.class_section_name')
+                ->select('MIN(classSection.id) AS id, classSection.class_id, classSection.class_section_id, classSection.class_section_name', false)
                 ->join('student_class sc', 'sc.class_section_id = classSection.class_section_id', 'inner')
                 ->where('sc.school_year', $termYear)
-                ->groupBy(['classSection.id', 'classSection.class_id', 'classSection.class_section_id', 'classSection.class_section_name'])
+                ->groupBy(['classSection.class_id', 'classSection.class_section_id', 'classSection.class_section_name'])
                 ->findAll();
             $useRosterFallback = !empty($classSections);
         }
@@ -588,9 +588,15 @@ public function showUpdateAttendanceForm()
             }
 
             $hasRoster = false;
+            $seenStudentIds = [];
 
             foreach ($students as $sc) {
                 $studentId = (int)$sc['student_id'];
+                if ($studentId <= 0 || isset($seenStudentIds[$studentId])) {
+                    continue;
+                }
+                $seenStudentIds[$studentId] = true;
+
                 $student   = $this->studentModel
                     ->select('id, firstname, lastname, school_id')
                     ->where('id', $studentId)