small fix, don't worry about it

app/frontend/src/lib/time.ts

@@ -0,0 +1,47 @@
+export function formatRelative(iso?: string): string {
+  if (!iso) {
+    return 'n/a';
+  }
+
+  const timestamp = Date.parse(iso);
+  if (Number.isNaN(timestamp)) {
+    return 'n/a';
+  }
+
+  const diffMs = Date.now() - timestamp;
+  const minute = 60_000;
+  const hour = 60 * minute;
+  const day = 24 * hour;
+
+  if (diffMs < minute) {
+    return 'just now';
+  }
+  if (diffMs < hour) {
+    return `${Math.floor(diffMs / minute)}m ago`;
+  }
+  if (diffMs < day) {
+    return `${Math.floor(diffMs / hour)}h ago`;
+  }
+  return `${Math.floor(diffMs / day)}d ago`;
+}
+
+export function formatDate(iso?: string): string {
+  if (!iso) {
+    return 'n/a';
+  }
+  const dt = new Date(iso);
+  if (Number.isNaN(dt.getTime())) {
+    return 'n/a';
+  }
+  return dt.toLocaleString();
+}
+
+export function seededMetric(seed: string, min: number, max: number): number {
+  let hash = 0;
+  for (let idx = 0; idx < seed.length; idx += 1) {
+    hash = (hash * 31 + seed.charCodeAt(idx)) & 0xffffffff;
+  }
+
+  const ratio = Math.abs(hash) % 10_000 / 10_000;
+  return Math.round(min + (max - min) * ratio);
+}