feat(scenarios): show last run status and timestamp on scenarios list

- extend findAll to join latest run per scenario via correlated subquery
- return lastRunStatus and lastRunAt fields in GET /scenarios response
- add Last Run column with badge and timestamp to ScenariosPage
- add integration tests for null and populated lastRunStatus

server/test/scenario.controller.spec.ts

@@ -171,6 +171,35 @@ describe("ScenarioController", () => {
         .get("/scenarios?orderDir=SIDEWAYS")
         .expect(400);
     });
+
+    it("returns lastRunStatus and lastRunAt as null when scenario has no runs", async () => {
+      await createScenario("no-runs-sc");
+      const res = await request(app.getHttpServer())
+        .get("/scenarios?orderBy=name&orderDir=ASC")
+        .expect(200);
+      const item = res.body.data.find(
+        (s: { name: string }) => s.name === "no-runs-sc",
+      );
+      expect(item).toBeDefined();
+      expect(item.lastRunStatus).toBeNull();
+      expect(item.lastRunAt).toBeNull();
+    });
+
+    it("returns lastRunStatus and lastRunAt reflecting the most recent run", async () => {
+      const sc = await createScenario("last-run-status-sc");
+      await createRun(sc.id);
+      const res = await request(app.getHttpServer())
+        .get("/scenarios?orderBy=name&orderDir=ASC")
+        .expect(200);
+      const item = res.body.data.find(
+        (s: { name: string }) => s.name === "last-run-status-sc",
+      );
+      expect(item).toBeDefined();
+      expect(["pending", "in_progress", "pass", "fail"]).toContain(
+        item.lastRunStatus,
+      );
+      expect(typeof item.lastRunAt).toBe("string");
+    });
   });
 
   // ── GET /scenarios/:id ─────────────────────────────────────────────────────