test(FN-4595): cover legacy backfill and wall-clock timing display

Fusion-Task-Id: FN-4595
Fusion-Task-Lineage: 73a3d0ad-5c10-4560-aec5-f9d138deeefd

packages/dashboard/app/components/TaskCard.tsx

@@ -161,7 +161,7 @@ function getInProgressElapsedMs(task: Task, nowMs: number): number | null {
 // inside instrumented code paths. Returns null on legacy tasks that completed
 // before `executionStartedAt` was tracked, so callers can fall back.
 function getTaskEndToEndDurationMs(task: Task, nowMs: number): number | null {
-  if (task.cumulativeActiveMs == null && task.firstExecutionAt == null) {
+  if (task.cumulativeActiveMs == null) {
     return getEndToEndDurationMs(task.executionStartedAt, task.executionCompletedAt, nowMs);
   }
   return getActiveRuntimeMs(task, nowMs);

packages/dashboard/app/components/__tests__/TaskCard.test.tsx

@@ -2348,6 +2348,26 @@ describe("TaskCard", () => {
     expect(timer?.getAttribute("title")).toBe("Execution time 6m");
   });
 
+  it("keeps legacy wall-clock timers after firstExecutionAt migration backfill", () => {
+    const { container } = render(
+      <TaskCard
+        task={makeTask({
+          column: "done",
+          executionStartedAt: "2026-04-25T12:00:00.000Z",
+          executionCompletedAt: "2026-04-25T12:30:00.000Z",
+          firstExecutionAt: "2026-04-25T12:00:00.000Z",
+          cumulativeActiveMs: undefined,
+        })}
+        onOpenDetail={noop}
+        addToast={noop}
+      />,
+    );
+
+    const timer = container.querySelector(".card-time-indicator");
+    expect(timer).not.toBeNull();
+    expect(timer?.textContent).toContain("30m");
+  });
+
   it.each(["merging", "merging-fix"] as const)("shows live merge elapsed in timer chip while task.status is %s", (status) => {
     vi.useFakeTimers();
     vi.setSystemTime(new Date("2026-04-25T13:45:00.000Z"));

packages/dashboard/app/components/__tests__/TaskTokenStatsPanel.test.tsx

@@ -210,6 +210,7 @@ describe("TaskTokenStatsPanel", () => {
 
       const metric = screen.getByText("Total execution time").closest(".task-token-stats-panel__metric");
       expect(metric).toHaveTextContent("5m 0s");
+      expect(screen.getByText("Wall-clock since first execution")).toBeInTheDocument();
     } finally {
       vi.useRealTimers();
     }