Ledger/earnings rows show when; Earn credits: never your own ads; burner sets Polygon fees + rotates RPCs on node errors

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

public/join.html

@@ -6,7 +6,7 @@
 <title>You're invited | InstantAdPay</title>
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+<link rel="stylesheet" href="/assets/site.css?v=20260910e">
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   .jn-hero{padding:34px 0 10px;text-align:left}
@@ -104,7 +104,7 @@
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+<script src="/assets/common.js?v=20260910b"></script>
 <script src="/assets/join.js?v=20260909b"></script>
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