feat: enhance exam loading functionality with examId support and update UI components

frontend/src/i18n/en.json

@@ -149,6 +149,7 @@
     "noSavedExams": "No saved exams yet",
     "noSavedExamsDesc": "Upload an exam from the home page, or create a new one to get started.",
     "createFirstExam": "Create Your First Exam",
+    "takeExam": "Take exam",
     "noAttempts": "No attempts yet",
     "noAttemptsDesc": "Take an exam to see your results here.",
     "attempts": "attempt",