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/components/PageHeader.tsx

@@ -0,0 +1,19 @@
+interface Props {
+  title: string;
+  blurb?: string;
+  actions?: React.ReactNode;
+}
+
+// Consistent page header: title + optional one-line blurb + a slot
+// for primary actions (refresh, new, etc.) aligned to the right.
+export function PageHeader({ title, blurb, actions }: Props) {
+  return (
+    <div className="flex flex-wrap items-start justify-between gap-3 sm:gap-4 mb-4 sm:mb-5">
+      <div className="min-w-0 flex-1">
+        <h1 className="text-xl sm:text-2xl font-semibold tracking-tight text-ink-50">{title}</h1>
+        {blurb && <p className="text-xs sm:text-sm text-ink-400 mt-0.5">{blurb}</p>}
+      </div>
+      {actions && <div className="flex flex-wrap items-center gap-2 shrink-0">{actions}</div>}
+    </div>
+  );
+}