refactor: Address code review feedback - remove redundant imports and use _ for unused variables

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

app/views/files.py

@@ -375,12 +375,12 @@ def _compute_step_summary(logs):
                 main_steps_seen[step_name] = (log.timestamp, status)
 
     # Count main step statuses from latest status per step
-    for timestamp, task_status in main_steps_seen.values():
+    for _, task_status in main_steps_seen.values():
         if task_status in main_counts:
             main_counts[task_status] += 1
 
     # Count upload task statuses from latest status per task
-    for timestamp, task_status in upload_tasks_seen.values():
+    for _, task_status in upload_tasks_seen.values():
         if task_status in upload_counts:
             upload_counts[task_status] += 1
 

tests/test_file_status_fix.py

@@ -259,7 +259,6 @@ class TestMetricsCountingBugFixes:
         This test ensures the function correctly selects the latest status per step
         based on timestamp, not position in the list.
         """
-        from datetime import datetime, timedelta
 
         class MockLog:
             def __init__(self, step_name, status, timestamp):
@@ -299,7 +298,6 @@ class TestMetricsCountingBugFixes:
 
         This ensures the function truly is order-independent.
         """
-        from datetime import datetime, timedelta
 
         class MockLog:
             def __init__(self, step_name, status, timestamp):