Add professor share & financial reports UI, expense management page

Adds payout configuration fields (percentage/hourly + per-session
expense allowance) with a live payout preview to the class form,
a new Financial Reports page (per-class and date-range/monthly tabs,
per-session drill-down dialog) with reusable stat cards, and an
Institutional Expenses management page. Registers routes, sidebar
navigation, and permission constants for the new financial_reports
and expenses permissions.

src/constants/permissions.js

@@ -77,7 +77,14 @@ export const PERMISSIONS = {
   CONTACT_INQUIRIES_UPDATE: 'contact_inquiries:update',
 
   PENDING_STUDENTS_READ: 'pending_students:read',
-  PENDING_STUDENTS_UPDATE: 'pending_students:update'
+  PENDING_STUDENTS_UPDATE: 'pending_students:update',
+
+  EXPENSES_CREATE: 'expenses:create',
+  EXPENSES_READ: 'expenses:read',
+  EXPENSES_UPDATE: 'expenses:update',
+  EXPENSES_DELETE: 'expenses:delete',
+
+  FINANCIAL_REPORTS_READ: 'financial_reports:read'
 };
 
 export const PERMISSION_GROUPS = [
@@ -241,6 +248,25 @@ export const PERMISSION_GROUPS = [
       { key: PERMISSIONS.PENDING_STUDENTS_READ, label: 'مشاهده ثبت‌نام‌های در انتظار' },
       { key: PERMISSIONS.PENDING_STUDENTS_UPDATE, label: 'تأیید / رد ثبت‌نام' }
     ]
+  },
+  {
+    key: 'expenses',
+    label: 'هزینه‌های موسسه',
+    icon: 'pi pi-money-bill',
+    permissions: [
+      { key: PERMISSIONS.EXPENSES_CREATE, label: 'ثبت هزینه' },
+      { key: PERMISSIONS.EXPENSES_READ, label: 'مشاهده هزینه‌ها' },
+      { key: PERMISSIONS.EXPENSES_UPDATE, label: 'ویرایش هزینه' },
+      { key: PERMISSIONS.EXPENSES_DELETE, label: 'حذف هزینه' }
+    ]
+  },
+  {
+    key: 'financial_reports',
+    label: 'گزارش‌های مالی',
+    icon: 'pi pi-chart-line',
+    permissions: [
+      { key: PERMISSIONS.FINANCIAL_REPORTS_READ, label: 'مشاهده گزارش‌های مالی' }
+    ]
   }
 ];