Add timestamps for answer tracking in report models and views; enhance timer display in templates

atlas/models.py

@@ -1376,6 +1376,10 @@ class BaseReportAnswer(models.Model):
     )
 
     completed = models.BooleanField(default=False)
+    # Timestamp when the user first loaded the question (started answering)
+    started_at = models.DateTimeField(null=True, blank=True)
+    # Timestamp when the answer was submitted/saved
+    submitted_at = models.DateTimeField(null=True, blank=True)
 
     def save(self, *args, **kwargs):
         self.clean()