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/ParentAttendanceReportController.php

@@ -247,7 +247,7 @@ class ParentAttendanceReportController extends BaseController
 
         // Upper bound already enforced by $validDates building
 
-        $semester    = (string) $this->configModel->getConfig('semester');
+        $semester    = (string) getSemester();
         $semesterResolver = new SemesterRangeService($this->configModel);
 
         $inserted        = 0;
@@ -996,7 +996,7 @@ class ParentAttendanceReportController extends BaseController
             : (string)$this->configModel->getConfig('school_year');
         $semester   = (is_string($semesterParam) && $semesterParam !== '')
             ? (string)$semesterParam
-            : (string)$this->configModel->getConfig('semester');
+            : (string) getSemester();
 
         $rows = $this->reportModel->listForDateRange($start, $end ?: null, $schoolYear, $semester);
 
@@ -1306,7 +1306,7 @@ class ParentAttendanceReportController extends BaseController
         }
 
         $schoolYear = (string)$this->configModel->getConfig('school_year');
-        $semester   = (string)$this->configModel->getConfig('semester');
+        $semester   = (string) getSemester();
 
         // Fetch students with their current-year class section (if any)
         try {
@@ -1362,7 +1362,7 @@ class ParentAttendanceReportController extends BaseController
         }
 
         $schoolYear = (string)$this->configModel->getConfig('school_year');
-        $semester   = (string)$this->configModel->getConfig('semester');
+        $semester   = (string) getSemester();
 
         // Resolve parent_id of the student
         $stu = $this->studentModel->select('id, parent_id, firstname, lastname')->find($studentId);