Wall: larger InstantAdPay brand line

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

public/wall.html

@@ -13,7 +13,7 @@
 <section>
   <div class="wrap" style="max-width:920px">
     <div class="wall-hero" style="text-align:center;padding:26px 0 18px">
-      <p class="eyebrow" style="margin:0 0 6px">InstantAdPay member wall</p>
+      <p style="margin:0 0 8px;font-family:var(--disp);font-weight:800;font-size:clamp(22px,3vw,30px);color:var(--ink);letter-spacing:-.01em">Instant<span style="color:var(--mint)">AdPay</span> <span style="font-weight:500;font-size:.62em;color:var(--muted)">member wall</span></p>
       <h1 style="font-size:clamp(28px,4.4vw,44px);margin:0 0 10px;line-height:1.1">Advertise and earn. <em style="font-style:normal;color:var(--mint)">Paid on-chain, instantly.</em></h1>
       <p class="muted" style="max-width:640px;margin:0 auto;font-size:15.5px">Real ad packages from $5. Every payout arrives as <b style="color:var(--ink)">POL on Polygon</b> in your own wallet, in the same transaction the package sells, on a public ledger. Free to join by email, and <span id="wallHost">this member</span> is your sponsor if you join from here.</p>
     </div>