fix(tempo,jira,tests,ui): fix 4 pending issues

- tempo: remove unsupported `workType` kwarg from create_worklog call;
  tempoapiclient v4 does not accept it → was causing every Tempo sync to fail
- tests: set created_at=datetime.utcnow() explicitly on test creation (both
  create_test and create_test_from_template) since the DB column has no
  server default, causing 'Created —' in the UI
- jira: remove duplicate Proof of Concept section from ticket description body;
  PoC already lives in customfield_10309, no need to repeat it in description
- ui: add TestPhaseTimeline component (read-only) showing RT execution time,
  blue queue time, blue evaluation time and lead validation timestamps derived
  from test phase timestamps; placed above WorklogTimeline in test detail page

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/services/tempo_service.py

@@ -69,21 +69,16 @@ def log_worklog(
     date: str,
     time_spent_seconds: int,
     description: str,
-    work_type: str | None = None,
 ) -> dict:
     """Create a worklog entry in Tempo using *user*'s personal token."""
     tempo = get_user_tempo_client(user)
-    kwargs: dict = {
-        "accountId": author_account_id,
-        "issueId": jira_issue_id,
-        "dateFrom": date,
-        "timeSpentSeconds": time_spent_seconds,
-        "description": description,
-    }
-    wt = work_type or settings.TEMPO_DEFAULT_WORK_TYPE
-    if wt:
-        kwargs["workType"] = wt
-    return tempo.create_worklog(**kwargs)
+    return tempo.create_worklog(
+        accountId=author_account_id,
+        issueId=jira_issue_id,
+        dateFrom=date,
+        timeSpentSeconds=time_spent_seconds,
+        description=description,
+    )
 
 
 def auto_log_test_worklog(