Implement single-file ChessLens dashboard server with live chess.com stats and ?u=<nick> routing

[Copilot]

ChessLens is now implemented as a zero-dependency Node.js web app (node index.js) that serves a dark, mobile-responsive dashboard driven by live chess.com public API data. The app accepts usernames via ?u=<nick> and renders core rating and performance stats in a single-file server architecture.

• Runtime architecture

  • Added index.js as the complete app: HTTP server, request parsing, API client, and HTML/CSS rendering.
  • Kept implementation dependency-free (http/https/url from Node core only).

• User routing + data fetch

  • Added query-param flow for ?u=<nick>.
  • Integrated https://api.chess.com/pub/player/<username>/stats fetch with graceful error surfacing in UI.

• Dashboard rendering

  • Added stat cards for Bullet / Blitz / Rapid / Daily ratings.
  • Added per-mode W/D/L records and computed win-rate progress bars.
  • Added summary cards for Tactics best and Puzzle Rush best.
  • Included escaping/safe text rendering for user and API-derived values.

• Documentation

  • Updated README with run instructions and URL usage for username-driven views.

const username = (requestUrl.searchParams.get('u') || '').trim();
if (username) {
  stats = await requestJson(
    `https://api.chess.com/pub/player/${encodeURIComponent(username)}/stats`
  );
}

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• api.chess.com
  • Triggering command: /usr/local/bin/node node index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

ChessLens — a zero-dependency Node.js web app that fetches live stats from the chess.com public API and renders a dark-themed, mobile-responsive dashboard. Single index.js file, no npm install needed. Displays Bullet / Blitz / Rapid / Daily ratings, W/D/L records with win-rate progress bars, Tactics and Puzzle Rush best scores. Username passed via ?u= query param. Run with node index.js, open in browser.