feat(exam): log time spent per scenario in exam report

Signed-off-by: Abhinav Sinha <[email protected]>

frontend/src/components/ExamHistory.jsx

@@ -22,6 +22,14 @@ function formatDate(iso) {
   })
 }
 
+function formatRowTime(secs) {
+  if (!secs || secs === 0) return '—'
+  const m = Math.floor(secs / 60)
+  const s = secs % 60
+  if (m > 0) return `${m}m ${s > 0 ? s + 's' : ''}`.trim()
+  return `${s}s`
+}
+
 function ScoreRing({ pct, passed, size = 72 }) {
   const r = (size / 2) - 7
   const circ = 2 * Math.PI * r
@@ -169,6 +177,15 @@ function AttemptDetail({ attempt }) {
                   {s.attempts > 0 && (
                     <span className={styles.rowAttempts}>{s.attempts} attempt{s.attempts > 1 ? 's' : ''}</span>
                   )}
+                  <span className={styles.rowTime}>
+                    {(s.time_spent_seconds > 0) && (
+                      <svg viewBox="0 0 24 24" width="10" height="10" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" style={{ marginRight: 3, verticalAlign: 'middle', opacity: 0.6 }}>
+                        <circle cx="12" cy="12" r="10" />
+                        <polyline points="12 6 12 12 16 14" />
+                      </svg>
+                    )}
+                    {formatRowTime(s.time_spent_seconds)}
+                  </span>
                   <span className={styles.rowPts}>
                     {s.status === 'completed' ? s.weight : 0}/{s.weight} pts
                   </span>