feat(phase-36): automatic Tempo time tracking via workflow buttons + fix campaign test management

- Add red_started_at/blue_started_at timing fields to Test model with Alembic migration

- Modify workflow transitions to auto-create integrity-hashed worklogs: Start Execution records red_started_at, Submit to Blue Team stops Red timer and creates worklog then starts Blue timer, Submit for Review stops Blue timer and creates worklog

- Auto-sync worklogs to Tempo when test has a Jira link

- Add LiveTimer component showing real-time elapsed counter during active phases

- Clear timing fields on test reopen

- Fix campaign test management: replace broken navigate-to-tests flow with AddTestToCampaignModal that lets users search and add existing tests directly from the campaign detail page

backend/app/schemas/test.py

@@ -137,6 +137,10 @@ class TestOut(BaseModel):
     blue_validation_status: str | None = None
     blue_validation_notes: str | None = None
 
+    # Phase timing fields (for Tempo worklogs)
+    red_started_at: datetime | None = None
+    blue_started_at: datetime | None = None
+
     # Remediation fields
     remediation_steps: str | None = None
     remediation_status: str | None = None