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/ClassProgressController.php

@@ -905,7 +905,7 @@ class ClassProgressController extends BaseController
         }
 
         $semesterResolver = new SemesterRangeService($this->configModel);
-        $semester = $semesterResolver->normalizeSemester((string) ($this->configModel->getConfig('semester') ?? ''));
+        $semester = $semesterResolver->normalizeSemester((string) (getSemester() ?? ''));
         if ($semester === '') {
             $semester = $semesterResolver->getSemesterForDate();
         }
@@ -968,7 +968,7 @@ class ClassProgressController extends BaseController
     protected function resolveCurrentTerm(): array
     {
         $schoolYear = $this->currentSchoolYearName((string) ($this->configModel->getConfig('school_year') ?? ''));
-        $semester = (string) ($this->configModel->getConfig('semester') ?? '');
+        $semester = (string) (getSemester() ?? '');
         return [$semester, $schoolYear];
     }