Integrate chess.js, deploy to GitHub Pages, prune deps

Chess engine:
- Replace custom move validation with chess.js for full rule support
  (check, checkmate, stalemate, en passant, castling, promotion, draws)
- Remove duplicated replay logic in App.tsx — now uses getStateAtMove()
- Move history now displays standard algebraic notation (Nf3, exd5)

Sharing:
- Add URL-based game sharing (moves encoded in query params)
- Add 'Copy Share Link' button alongside existing ASCII copy/paste
- Load game state from URL on page load

Platform migration:
- Remove GitHub Spark dependency — app is now a standalone Vite/React app
- Replace useKV with localStorage for persistence
- Remove Spark vite plugins and theme system
- Add GitHub Actions workflow for GitHub Pages deployment
- Set vite base path to /dm-chess/ for Pages hosting

Dependency cleanup:
- Remove 40+ unused packages (three.js, d3, recharts, framer-motion,
  octokit, react-hook-form, zod, 20+ radix components, etc.)
- Remove 38 unused UI components from src/components/ui/
- Remove unused hooks (use-mobile.ts)
- Net reduction: ~11,200 lines deleted, ~2,300 added

Housekeeping:
- Rename package from spark-template to dm-chess
- Rewrite README without emoji formatting
- Fix phosphor icon imports
- Remove Spark artifacts (.spark-initial-sha, theme.json)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: dvelton

.github/workflows/deploy.yml

@@ -0,0 +1,40 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+      - run: npm ci
+      - run: npm run build
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: dist
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - id: deployment
+        uses: actions/deploy-pages@v4

.spark-initial-sha

@@ -1,79 +1,62 @@
-# ♟️ DM-chess
+# DM-Chess
 
-> Play chess with a colleague—right from your DMs. No apps. No logins. Just pure ASCII chess.
+Play chess with a colleague right from your DMs. No apps, no logins — just copy, paste, and play.
 
-<p align="center">
-  <img src="screenshot1.png" alt="DM-chess Screenshot 1" width="600">
-</p>
+![DM-Chess Screenshot](screenshot1.png)
 
----
+## What is this?
 
-## 🧩 What Is DM-chess?
+DM-Chess is a lightweight chess game you play by sharing text over Slack, Teams, or any messaging app. Make your move in the browser, copy the game state, paste it to your opponent. They paste it back into their browser, make their move, and send it back.
 
-**DM-chess** is a lightweight, ASCII-based chess game you can play directly via **Slack DMs** or **text messages**—no installation, no logins, no integrations.
+There's nothing to install and no accounts to create.
 
-Just type and play.
+**Play it here: [dvelton.github.io/dm-chess](https://dvelton.github.io/dm-chess)**
 
----
+## How it works
 
-## 🕹️ How It Works
+1. Open the app and make your move by clicking a piece and then its destination.
+2. Go to the **Share** tab and either:
+   - **Copy the ASCII text** and paste it in Slack/Teams, or
+   - **Copy a share link** your opponent can open directly.
+3. Your opponent loads the game (paste text + "Load Game", or just open the link), makes their move, and sends it back.
+4. Repeat until checkmate.
 
-- ♟️ Try it [here](https://gh.io/dm-chess)
-- 🗺️ The game board is sent as clean ASCII art
-- ➡️ Make moves in algebraic notation (e.g. `e2 e4`)
-- ✅ The board updates automatically after each move
+The game auto-saves in your browser between sessions.
 
----
+## Features
 
-## 📸 Screenshots 
+- Full chess rules via [chess.js](https://github.com/jhlywa/chess.js) — check, checkmate, stalemate, castling, en passant, pawn promotion, draw detection
+- ASCII board output for sharing in any text channel
+- URL-based sharing (game state encoded in query params)
+- Move history with step-through replay
+- Captured piece tracking
+- Persistent local storage — close the tab and come back later
 
-<p align="center">
-  <img src="screenshot1.png" alt="Game Start" width="600"><br>
-  <em>Game Start: Board appears in your DM</em>
-</p>
+## Screenshots
 
-<p align="center">
-  <img src="screenshot2.png" alt="Move Response" width="600"><br>
-  <em>Move submitted and board updated</em>
-</p>
+| Start | Mid-game | Move history |
+|-------|----------|--------------|
+| ![Game Start](screenshot1.png) | ![Move Response](screenshot2.png) | ![Ongoing Match](screenshot3.png) |
 
-<p align="center">
-  <img src="screenshot3.png" alt="Ongoing Match" width="600"><br>
-  <em>Simple, ongoing gameplay in plain text</em>
-</p>
+## Development
 
-</details>
+```bash
+npm install
+npm run dev
+```
 
----
+Build for production:
 
-## ✨ Features
+```bash
+npm run build
+```
 
-| Feature                  | Description |
-|--------------------------|-------------|
-| 📦 **Zero Setup**        | No accounts, no auth, no browser needed |
-| ✉️ **Slack DMs & SMS**   | Play where you already communicate |
-| 🔡 **Text-Only Board**   | Clean, readable ASCII chessboards |
-| 🎯 **Command-Based Play**| Use simple commands like `e2 e4` to make moves |
-| 🛡️ **Secure by Design** | No external integrations or data sharing |
+Deploys automatically to GitHub Pages on push to `main`.
 
----
+## Tech stack
 
-## ✅ Why You'll Love It
+React, TypeScript, Vite, Tailwind CSS, chess.js, Radix UI primitives.
 
-- [x] No distractions, just chess
-- [x] Great for casual games with colleagues
-- [x] Fully text-based—works even on feature phones
-- [ ] No Elo rating shame (yet)
-
----
-
-## 🚀 Getting Started
-
-There’s nothing to install.
-
-- 🕊️ Start a match and send your first move!
-
----
-
-> _Chess isn't about fancy UIs. It’s about the moves you make._
+## License
 
+[MIT](LICENSE)

README.md

@@ -4,7 +4,7 @@
 <head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Slack Chess</title>
+    <title>DM-Chess</title>
     <link rel="preconnect" href="https://fonts.googleapis.com">
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
     <link href="https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&family=Roboto+Mono&display=swap" rel="stylesheet">