feat: extract timestamp formatting and text truncation into separate utility functions

frontend/src/lib/formatters.ts

@@ -0,0 +1,49 @@
+const DASH = "—";
+
+export const truncateText = (
+  value?: string | null,
+  max = 24,
+  fallback = DASH,
+): string => {
+  if (!value) return fallback;
+  if (value.length <= max) return value;
+  return `${value.slice(0, max)}…`;
+};
+
+export const parseTimestamp = (value?: string | null): Date | null => {
+  if (!value) return null;
+  const hasTimeZone = /[zZ]|[+-]\d\d:\d\d$/.test(value);
+  const normalized = hasTimeZone ? value : `${value}Z`;
+  const date = new Date(normalized);
+  return Number.isNaN(date.getTime()) ? null : date;
+};
+
+export const formatTimestamp = (
+  value?: string | null,
+  fallback = DASH,
+): string => {
+  const date = parseTimestamp(value);
+  if (!date) return fallback;
+  return date.toLocaleString(undefined, {
+    month: "short",
+    day: "numeric",
+    hour: "2-digit",
+    minute: "2-digit",
+  });
+};
+
+export const formatRelativeTimestamp = (
+  value?: string | null,
+  fallback = DASH,
+): string => {
+  const date = parseTimestamp(value);
+  if (!date) return fallback;
+  const diff = Date.now() - date.getTime();
+  const minutes = Math.round(diff / 60000);
+  if (minutes < 1) return "Just now";
+  if (minutes < 60) return `${minutes}m ago`;
+  const hours = Math.round(minutes / 60);
+  if (hours < 24) return `${hours}h ago`;
+  const days = Math.round(hours / 24);
+  return `${days}d ago`;
+};