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/alembic/versions/b021_add_phase_timing_fields.py

@@ -0,0 +1,32 @@
+"""add_phase_timing_fields
+
+Revision ID: b021phasetiming
+Revises: b020jiraworklogs
+Create Date: 2026-02-17 18:00:00.000000
+
+Add red_started_at and blue_started_at columns to the tests table
+so that automatic worklogs can record real elapsed time per phase.
+"""
+
+from alembic import op
+
+revision = "b021phasetiming"
+down_revision = "b020jiraworklogs"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.execute("""
+        ALTER TABLE tests
+            ADD COLUMN IF NOT EXISTS red_started_at  TIMESTAMP,
+            ADD COLUMN IF NOT EXISTS blue_started_at TIMESTAMP;
+    """)
+
+
+def downgrade() -> None:
+    op.execute("""
+        ALTER TABLE tests
+            DROP COLUMN IF EXISTS red_started_at,
+            DROP COLUMN IF EXISTS blue_started_at;
+    """)