Config-driven wallet-connect notice (for the Blockaid false-positive window)

New shared wallet-notice.js on join-now, my, training: if config.walletNotice
is set, shows an admin-authored heads-up right above every connect/unlock
button; empty string hides it everywhere (one PATCH, no deploy). Placed at the
friction point only, not a sitewide banner, so unaffected wallets/Mini App
users are not told about a warning they will never see.

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

public/wallet-notice.js

@@ -0,0 +1,22 @@
+// Temporary, admin-controlled heads-up shown right above any wallet-connect
+// button while a scanner false-positive is being cleared. Driven by
+// config.walletNotice (admin PATCH): non-empty string = show it, ""/unset =
+// nothing renders. One config flip removes it everywhere, no deploy.
+(function () {
+  'use strict';
+  fetch('/api/public/config').then(function (r) { return r.json(); }).then(function (c) {
+    var msg = (c && c.walletNotice || '').trim();
+    if (!msg) return;
+    var btns = [].slice.call(document.querySelectorAll('button, a.btn'));
+    var targets = btns.filter(function (b) { return /connect|unlock/i.test(b.textContent || ''); });
+    if (!targets.length) return;
+    targets.forEach(function (btn) {
+      if (btn.dataset.wnDone) return; btn.dataset.wnDone = '1';
+      var n = document.createElement('div');
+      n.className = 'callout';
+      n.style.cssText = 'margin:0 0 12px;font-size:13px;line-height:1.5;border-color:rgba(243,190,67,.5)';
+      n.innerHTML = 'ℹ️ ' + msg; // admin-authored, same trust level as other config-injected copy
+      btn.parentNode.insertBefore(n, btn);
+    });
+  }).catch(function () {});
+})();