Add vpinball: a browser Visual Pinball player

Next.js app that plays real .vpx tables via @valknar/vpinball-wasm
(WebAssembly Visual Pinball). Demo mode with the bundled default
table, drag-and-drop custom table upload, a cabinet-styled UI with a
coin-door HUD (fullscreen/stats/info/eject), a custom 404 page, PWA
support (hand-rolled service worker), and a static Docker Compose
deployment behind nginx.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012hQoM3jJT1Lx7CMTciMzvD

lib/format.ts

@@ -0,0 +1,12 @@
+export function formatBytes(bytes: number): string {
+  if (bytes === 0) return "0 B";
+  const units = ["B", "KB", "MB", "GB"];
+  const exponent = Math.min(Math.floor(Math.log(bytes) / Math.log(1024)), units.length - 1);
+  const value = bytes / 1024 ** exponent;
+  return `${exponent === 0 ? value : value.toFixed(1)} ${units[exponent]}`;
+}
+
+export function formatDuration(ms: number): string {
+  if (ms < 1000) return `${Math.round(ms)} ms`;
+  return `${(ms / 1000).toFixed(1)} s`;
+}