Wall page: InstantAdPay headline + POL on Polygon; payouts-in-POL copy on join/home/Wallet/objections/chatbot

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

public/index.html

@@ -54,6 +54,7 @@
     <p class="lead">Buy real ad packages from 5 to 250 dollars. Every purchase settles through
       a smart contract you can read yourself, and your earnings land in
       <b>your own wallet</b> before the page even refreshes.</p>
+    <p class="small muted" style="margin:-14px auto 26px;max-width:620px">One crypto, one network: packages are paid in <b style="color:var(--ink)">POL on Polygon</b> and every payout arrives as POL in your wallet. Buy POL with a card inside if you have never held any.</p>
     <div class="ctas">
       <a class="btn" href="/my">Join free</a>
       <a class="btn sec" href="/ledger">Watch payments land live</a>