Show app version in lobby footer; expose version via /api/config

- Server reads version from package.json and returns it from /api/config
- Client fetches it at boot and renders it in a lobby footer
- Bump service-worker cache to shelem-v3 so precache refreshes

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "shelem",
-  "version": "1.0.0",
+  "version": "1.1.2",
   "description": "Shelem card game — multiplayer",
   "main": "server.js",
   "scripts": {

public/app.js

@@ -1700,11 +1700,20 @@ async function validateAuth() {
   updateAuthBar();
 }
 
+// Show the running app version in the lobby footer (served from /api/config)
+async function loadAppVersion() {
+  try {
+    const d = await fetch('/api/config').then(r => r.json());
+    if (d.version) $('app-version').textContent = `v${d.version}`;
+  } catch { /* ignore */ }
+}
+
 // ─── Boot ─────────────────────────────────────────────────────
 document.addEventListener('DOMContentLoaded', async () => {
   initLobby();
   wireGameEvents();
   applyBarBottom();
+  loadAppVersion();
 
   // Drop any stale/corrupted auth token before we use it to connect
   await validateAuth();

public/index.html

@@ -91,6 +91,7 @@
 
     <p id="lobby-error" class="error-msg"></p>
   </div>
+  <div id="app-version" class="app-version"></div>
 </div>
 
 <!-- ══════════════ WAITING ROOM ══════════════ -->

public/style.css

@@ -1033,6 +1033,15 @@ input:focus { border-color: var(--gold); }
 .lb-table td { border-bottom: 1px solid rgba(255,255,255,.05); }
 .lb-table tr:hover td { background: rgba(255,255,255,.04); }
 
+/* ── App version footer ───── */
+.app-version {
+  text-align: center;
+  margin-top: 14px;
+  font-size: .72rem;
+  color: rgba(255,255,255,.35);
+  letter-spacing: .5px;
+}
+
 /* ── Round-by-round breakdown ───── */
 .round-breakdown-wrap { margin: 6px 0 2px; }
 .rb-scroll { max-height: 42vh; overflow-y: auto; -webkit-overflow-scrolling: touch; }

public/sw.js

@@ -1,5 +1,5 @@
 'use strict';
-const CACHE_NAME = 'shelem-v2';
+const CACHE_NAME = 'shelem-v3';
 
 // ── Generate all 55 card paths ──────────────────────────────────
 const SUITS = ['CLUB', 'DIAMOND', 'HEART', 'SPADE'];

server.js

@@ -132,8 +132,10 @@ app.use(express.static(path.join(__dirname, 'public'), {
 }));
 
 // ─── Auth API ─────────────────────────────────────────────────
+const APP_VERSION = require('./package.json').version;
+
 app.get('/api/config', (_req, res) => {
-  res.json({ signupsOpen: config.signupsOpen });
+  res.json({ signupsOpen: config.signupsOpen, version: APP_VERSION });
 });
 
 // Validate the stored auth token; the client uses this at startup to detect a