feat(FN-2875): add done-task elapsed time ceiling rounding

- Add formatElapsedDurationDone to render done task elapsed time with ceiling-based minute/hour/day rounding
- Keep in-progress time indicator logic on existing floor-based formatElapsedDuration behavior
- Route done-card time indicator rendering through the new done-specific formatter
- Expand TaskCard tests to cover done rounding semantics and preserve in-progress rounding expectations

packages/dashboard/app/components/TaskCard.tsx

@@ -169,6 +169,20 @@ function formatElapsedDuration(elapsedMs: number): string {
   return `${elapsedDays}d`;
 }
 
+export function formatElapsedDurationDone(elapsedMs: number): string {
+  if (!Number.isFinite(elapsedMs) || elapsedMs < 0) return "";
+  if (elapsedMs === 0) return "";
+
+  const elapsedMinutes = Math.ceil(elapsedMs / 60_000);
+  if (elapsedMinutes < 59) return `${elapsedMinutes}m`;
+
+  const elapsedHours = Math.ceil(elapsedMs / 3_600_000);
+  if (elapsedHours < 24) return `${elapsedHours}h`;
+
+  const elapsedDays = Math.ceil(elapsedMs / 86_400_000);
+  return `${elapsedDays}d`;
+}
+
 
 interface TaskCardProps {
   task: Task;
@@ -692,12 +706,12 @@ function TaskCardComponent({
       return null;
     }
 
-    const elapsedLabel = formatElapsedDuration(instrumentedMs);
-    if (!elapsedLabel) {
-      return null;
-    }
-
     if (task.column === "in-progress") {
+      const elapsedLabel = formatElapsedDuration(instrumentedMs);
+      if (!elapsedLabel) {
+        return null;
+      }
+
       return {
         label: elapsedLabel,
         title: `Execution time ${elapsedLabel}`,
@@ -705,6 +719,11 @@ function TaskCardComponent({
       };
     }
 
+    const elapsedLabel = formatElapsedDurationDone(instrumentedMs);
+    if (!elapsedLabel) {
+      return null;
+    }
+
     const completionMs = getDoneCompletionMs(task);
     if (completionMs == null) {
       return {

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

@@ -1,6 +1,6 @@
 import { afterEach, describe, it, expect, vi } from "vitest";
 import { render, screen, fireEvent, waitFor, act } from "@testing-library/react";
-import { TaskCard } from "../TaskCard";
+import { TaskCard, formatElapsedDurationDone } from "../TaskCard";
 import type { Task } from "@fusion/core";
 
 // Mock lucide-react to avoid SVG rendering issues in test env
@@ -712,6 +712,72 @@ describe("TaskCard", () => {
     expect(container.querySelector(".card-time-indicator")).toBeNull();
   });
 
+  describe("formatElapsedDuration rounding for done tasks", () => {
+    it.each([
+      [59_999, "1m"],
+      [60_000, "1m"],
+      [90_000, "2m"],
+      [3_540_000, "1h"],
+      [3_600_000, "1h"],
+      [86_400_000, "1d"],
+    ])("formats %dms as %s for done tasks", (elapsedMs, expected) => {
+      expect(formatElapsedDurationDone(elapsedMs)).toBe(expected);
+    });
+
+    it("keeps in-progress rounding with floor semantics", () => {
+      vi.useFakeTimers();
+      vi.setSystemTime(new Date("2026-04-25T12:01:30.000Z"));
+
+      const { container } = render(
+        <TaskCard
+          task={makeTask({
+            column: "in-progress",
+            workflowStepResults: [
+              {
+                workflowStepId: "step-1",
+                workflowStepName: "Plan",
+                phase: "pre-merge" as const,
+                status: "pending" as const,
+                startedAt: "2026-04-25T12:00:00.000Z",
+              },
+            ],
+          })}
+          onOpenDetail={noop}
+          addToast={noop}
+        />,
+      );
+
+      expect(container.querySelector(".card-time-indicator")?.textContent).toContain("1m");
+    });
+
+    it("renders done-card timer with ceiling rounding for fractional minutes", () => {
+      const { container } = render(
+        <TaskCard
+          task={makeTask({
+            column: "done",
+            createdAt: "2026-04-25T12:00:00.000Z",
+            columnMovedAt: "2026-04-25T12:04:30.000Z",
+            updatedAt: "2026-04-25T12:04:30.000Z",
+            workflowStepResults: [
+              {
+                workflowStepId: "step-1",
+                workflowStepName: "Plan",
+                phase: "pre-merge" as const,
+                status: "passed" as const,
+                startedAt: "2026-04-25T12:00:00.000Z",
+                completedAt: "2026-04-25T12:04:30.000Z",
+              },
+            ],
+          })}
+          onOpenDetail={noop}
+          addToast={noop}
+        />,
+      );
+
+      expect(container.querySelector(".card-time-indicator")?.textContent).toContain("5m");
+    });
+  });
+
   it("live-ticks workflow runtime for in-progress steps", () => {
     vi.useFakeTimers();
     vi.setSystemTime(new Date("2026-04-25T12:00:30.000Z"));