Mobile wallet deep links on the join page: no injected wallet -> offer Open-in-MetaMask/Trust buttons that reopen this URL (ref included) inside the wallet's dApp browser

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

private/join-now.html

@@ -21,6 +21,13 @@
     <h2 style="margin:0 0 10px;font-size:18px">1 · Connect your wallet</h2>
     <p style="color:var(--muted);font-size:14px;margin:0 0 14px">Use MetaMask or Trust Wallet on <strong>Polygon</strong>, funded with enough POL for your Premium entry plus a little gas.</p>
     <button id="connectBtn" class="btn btn-primary">Connect wallet</button>
+    <div id="walletHelp" style="display:none;margin-top:14px;padding:14px;border:1px solid var(--line);border-radius:12px;background:#08192880">
+      <div style="font-weight:800;margin-bottom:6px">📱 On your phone? Open this page inside your wallet app.</div>
+      <p style="color:var(--muted);font-size:13px;margin:0 0 10px">Mobile browsers can't see your wallet — but your wallet app has its own browser that can. Tap your wallet below and this exact page (with the right sponsor) opens inside it, ready to connect:</p>
+      <a id="mmDeep" class="btn btn-secondary" style="width:100%;margin-bottom:8px" href="#">🦊 Open in MetaMask</a>
+      <a id="twDeep" class="btn btn-secondary" style="width:100%" href="#">🛡️ Open in Trust Wallet</a>
+      <p class="micro" style="margin:10px 0 0">Don't have a wallet yet? <a href="/training">Video 2 in the training</a> shows how to set one up safely (2 minutes). On a computer, install the MetaMask browser extension and refresh this page.</p>
+    </div>
     <div id="connected" style="display:none">
       <div class="dj-kv"><span>Wallet</span><b id="wallet" class="dj-mono">—</b></div>
       <div class="dj-kv"><span>Network</span><b>Polygon Mainnet ✓</b></div>