feat: redesign Exams List page to show submitted custom exams

- Added Custom Exams tab showing all exams from Generation page
- Displays title, module badges, duration, and status
- Added Create Exam button
- Kept Exam Sessions tab for institutional sessions
- Search filters across exams

Made-with: Cursor

node_modules/d3-time-format/locale/en-CA.json

@@ -0,0 +1,10 @@
+{
+  "dateTime": "%a %b %e %X %Y",
+  "date": "%Y-%m-%d",
+  "time": "%H:%M:%S",
+  "periods": ["AM", "PM"],
+  "days": ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"],
+  "shortDays": ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"],
+  "months": ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
+  "shortMonths": ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
+}