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/ExpenseController.php

@@ -26,7 +26,7 @@ class ExpenseController extends BaseController
         $this->financialAttachmentService = new FinancialAttachmentService();
 
         $this->schoolYear = $this->configModel->getConfig('school_year');
-        $this->semester   = $this->configModel->getConfig('semester');
+        $this->semester   = getSemester();
 
         // Default list of common retailors; adjust as needed
         $this->retailors = [
@@ -96,6 +96,8 @@ class ExpenseController extends BaseController
 
     public function index()
     {
+        $schoolYear = (string) ($this->configModel->getConfig('school_year') ?? '');
+
         $expenses = $this->expenseModel
             ->select("
                 expenses.*,
@@ -104,6 +106,7 @@ class ExpenseController extends BaseController
             ")
             ->join('users u', 'u.id = expenses.purchased_by', 'left')
             ->join('users approver', 'approver.id = expenses.approved_by', 'left')
+            ->where('expenses.school_year', $schoolYear)
             ->orderBy('expenses.created_at', 'DESC')
             ->findAll();
 
@@ -115,7 +118,10 @@ class ExpenseController extends BaseController
             return $row;
         }, $expenses);
 
-        return view('expenses/index', ['expenses' => $expenses]);
+        return view('expenses/index', [
+            'expenses'   => $expenses,
+            'schoolYear' => $schoolYear,
+        ]);
     }
 
     public function create()