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

frontend/src/pages/CampaignDetailPage.tsx

@@ -30,6 +30,7 @@ import { useAuth } from "../context/AuthContext";
 import CampaignTimeline from "../components/CampaignTimeline";
 import JiraLinkPanel from "../components/JiraLinkPanel";
 import WorklogTimeline from "../components/WorklogTimeline";
+import AddTestToCampaignModal from "../components/AddTestToCampaignModal";
 
 const statusColors: Record<string, string> = {
   draft: "bg-gray-800/50 text-gray-400 border-gray-600/30",
@@ -61,6 +62,7 @@ export default function CampaignDetailPage() {
   const { user } = useAuth();
 
   const [toast, setToast] = useState<{ message: string; type: "success" | "error" } | null>(null);
+  const [showAddTestModal, setShowAddTestModal] = useState(false);
 
   const showToast = (message: string, type: "success" | "error") => {
     setToast({ message, type });
@@ -500,7 +502,7 @@ export default function CampaignDetailPage() {
           </h2>
           {canManage && campaign.status === "draft" && (
             <button
-              onClick={() => navigate(`/tests?campaign=${campaignId}`)}
+              onClick={() => setShowAddTestModal(true)}
               className="flex items-center gap-1.5 rounded-lg border border-cyan-500/30 bg-cyan-500/10 px-3 py-1.5 text-sm font-medium text-cyan-400 hover:bg-cyan-500/20 transition-colors"
             >
               <Plus className="h-4 w-4" />
@@ -606,6 +608,15 @@ export default function CampaignDetailPage() {
         <WorklogTimeline entityType="campaign" entityId={campaignId!} />
       </div>
 
+      {/* Add Test to Campaign Modal */}
+      <AddTestToCampaignModal
+        campaignId={campaignId!}
+        existingTestIds={campaign.tests.map((ct) => ct.test_id)}
+        open={showAddTestModal}
+        onClose={() => setShowAddTestModal(false)}
+        onSuccess={() => showToast("Test added to campaign", "success")}
+      />
+
       {/* Toast notification */}
       {toast && (
         <div