Import december-2020-12-18 from private repo (scrubbed 2026-05-27)

Targets Rec Room 2020.12.18 client.

Re-import after adding:
- DorkNet.ClientMod/dorknet-clientmod.json.template — config schema
  the launcher's manifest-driven patcher renders into UserData/.
- tools/build-patcher-zip.ps1 — produces the dorknet-clientpatch-{key}.zip
  Release asset the launcher fetches.
- .github/workflows/release.yml — auto-publishes both Release assets
  on v1-december-* tag push.

Scrubbed via maintainer-side scrub-for-public.ps1: same drop rules as
the prior import, plus build-patcher-zip.ps1 added to the tools/
allow-list so it survives the scrub.

DorkNet.Server/admin-ui/src/lib/format.ts

@@ -0,0 +1,59 @@
+// Display helpers used across pages. Kept here so we render dates,
+// durations, and numeric quantities the same way everywhere — a player
+// table and a player detail page should not disagree about how to
+// format "5 days ago".
+
+export function relativeTime(iso: string | null | undefined): string {
+  if (!iso) return '—';
+  const t = new Date(iso).getTime();
+  if (!Number.isFinite(t)) return '—';
+  const diffSec = Math.round((Date.now() - t) / 1000);
+  const abs = Math.abs(diffSec);
+  if (abs < 45) return diffSec >= 0 ? 'just now' : 'in a moment';
+  const units: Array<[number, string]> = [
+    [60, 'sec'],
+    [60, 'min'],
+    [24, 'hr'],
+    [7, 'day'],
+    [4.345, 'wk'],
+    [12, 'mo'],
+    [Infinity, 'yr'],
+  ];
+  let v = abs;
+  let label = 'sec';
+  for (let i = 0; i < units.length; i++) {
+    const [step, name] = units[i];
+    if (v < step) { label = name; break; }
+    v = v / step;
+    label = units[i + 1]?.[1] ?? 'yr';
+  }
+  const rounded = v >= 10 ? Math.round(v) : Math.round(v * 10) / 10;
+  return diffSec >= 0 ? `${rounded} ${label} ago` : `in ${rounded} ${label}`;
+}
+
+export function absoluteTime(iso: string | null | undefined): string {
+  if (!iso) return '—';
+  const d = new Date(iso);
+  if (!Number.isFinite(d.getTime())) return '—';
+  return d.toLocaleString();
+}
+
+export function num(n: number | null | undefined): string {
+  if (n === null || n === undefined || !Number.isFinite(n)) return '—';
+  return n.toLocaleString();
+}
+
+export function clip(s: string | null | undefined, max = 80): string {
+  if (!s) return '';
+  return s.length <= max ? s : s.slice(0, max - 1) + '…';
+}
+
+// Currency type IDs follow the canonical Rec Room enum:
+//   1 = Tokens, 2 = Coins (RecRoom currency).
+export function currencyName(type: number): string {
+  switch (type) {
+    case 1: return 'Tokens';
+    case 2: return 'Coins';
+    default: return `Currency #${type}`;
+  }
+}