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.

package.json

@@ -7,7 +7,7 @@
     "dev": "vite",
     "build": "vite build",
     "preview": "vite preview",
-    "test": "node --test src/utils/uploadResponse.test.js src/utils/classSchedule.test.js src/utils/paymentAmount.test.js"
+    "test": "node --test src/utils/uploadResponse.test.js src/utils/classSchedule.test.js src/utils/paymentAmount.test.js src/utils/professorShare.test.js"
   },
   "dependencies": {
     "@fontsource/vazirmatn": "^5.3.0",