Add ordinal approval window

extension/approval.html

@@ -0,0 +1,12 @@
+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1">
+  <title>Inscriboor — sign</title><link rel="stylesheet" href="style.css">
+</head>
+<body class="approval"><main>
+  <p class="eyebrow">INSCRIBOOR</p><h1>Sign inscription?</h1>
+  <p class="warning">Super Testnet test key only. No real funds.</p>
+  <dl id="summary"></dl><p id="error" class="error"></p>
+  <div class="actions"><button id="reject">Reject</button><button id="approve" class="primary">Sign</button></div>
+</main><script src="approval.js"></script></body></html>