feat(web): richer active-job rows on The Floor (source/format/tracks, stage, elapsed, error)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/src/app/_ui/status.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from "vitest";
-import { describeJob } from "./status";
+import { describeJob, timeAgo } from "./status";
 
 describe("describeJob", () => {
   it("maps pipeline states to literal labels + severity kind", () => {
@@ -22,3 +22,29 @@ describe("describeJob", () => {
     expect(describeJob("downloading", "???").step).toBe(0);
   });
 });
+
+describe("timeAgo", () => {
+  const now = new Date("2026-07-13T12:00:00Z").getTime();
+
+  it("returns 'just now' for deltas under 60s", () => {
+    expect(timeAgo(new Date(now - 30_000).toISOString(), now)).toBe("just now");
+  });
+
+  it("returns minutes for sub-hour deltas", () => {
+    expect(timeAgo(new Date(now - 5 * 60_000).toISOString(), now)).toBe("5m");
+  });
+
+  it("returns hours for sub-day deltas", () => {
+    expect(timeAgo(new Date(now - 2 * 3600_000).toISOString(), now)).toBe("2h");
+  });
+
+  it("returns days for multi-day deltas", () => {
+    expect(timeAgo(new Date(now - 3 * 86_400_000).toISOString(), now)).toBe("3d");
+  });
+
+  it("returns empty string for null/undefined/invalid input", () => {
+    expect(timeAgo(null, now)).toBe("");
+    expect(timeAgo(undefined, now)).toBe("");
+    expect(timeAgo("not-a-date", now)).toBe("");
+  });
+});