Member area: loading spinner instead of flashing the sign-in card

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

public/assets/my.js

@@ -486,7 +486,10 @@
     document.getElementById('memberArea').classList.toggle('side-open'));
 
   async function render() {
-    const me = await IAP.refreshNavWallet();
+    // while /api/me answers, show a spinner instead of flashing the sign-in card at a signed-in member
+    let me = null;
+    try { me = await IAP.refreshNavWallet(); } catch (e) { me = null; }
+    if ($('bootSpin')) $('bootSpin').hidden = true;
     // one way in: email. A wallet-only session (no account) is sent back to the
     // email card with a finish-setup note; verifying the code links that wallet.
     const walletOnly = !!(me && me.signedIn && !me.email);