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/GradingController.php

@@ -67,7 +67,7 @@ class GradingController extends BaseController
         $this->configModel = new ConfigurationModel();
         $this->db = \Config\Database::connect();
         $this->schoolYear = $this->configModel->getConfig('school_year');
-        $this->semester = $this->configModel->getConfig('semester');
+        $this->semester = getSemester();
         $this->classSection = new ClassSectionModel();
         $this->attendanceCalculator = new AttendanceCalculator(
             new AttendanceRecordModel(),
@@ -93,7 +93,7 @@ class GradingController extends BaseController
         $configModel = new ConfigurationModel();
 
         $schoolYear = $configModel->getConfig('school_year');
-        $semester = $configModel->getConfig('semester');
+        $semester = getSemester();
 
         $student = $studentModel->find($studentId);
         $scores = $scoreModel->where([
@@ -140,7 +140,7 @@ class GradingController extends BaseController
         $studentModel = new StudentModel();
 
         $schoolYear = $configModel->getConfig('school_year');
-        $semester = $configModel->getConfig('semester');
+        $semester = getSemester();
 
         $model = $this->getModelByType($type);
         $classSectionIdInt = (int) ($classSectionId ?? 0);
@@ -433,6 +433,7 @@ class GradingController extends BaseController
         // Build structures keyed by BUSINESS section id
         $grades            = []; // class_id => [ ['class_section_id','class_section_name'], ... ]
         $studentsBySection = []; // section_id => [ students... ]
+        $seenStudentsBySection = [];
 
         foreach ($rows as $r) {
             $sectionId   = (int) ($r['section_id'] ?? 0);   // BUSINESS id
@@ -457,6 +458,8 @@ class GradingController extends BaseController
 
             $sid = (int) ($r['student_id'] ?? 0);
             if ($sid <= 0) continue;
+            if (isset($seenStudentsBySection[$sectionId][$sid])) continue;
+            $seenStudentsBySection[$sectionId][$sid] = true;
 
             $ptapScore     = $r['ss_ptap_score'] ?? null;
             $semesterScore = $r['ss_semester_score'] ?? null;