Wallet help: SafePal + any-wallet in-app-browser path (not just MetaMask/Trust)

Mobile users on SafePal/Coinbase/Rabby had no route in — the deep-link help
only offered MetaMask + Trust. Added a wallet-agnostic instruction (open your
wallet app -> Browser/DApp tab -> type the join URL) that works via the
injected provider our EIP-6963 picker already resolves; join-now fills the
sponsor path into the hint. Dashboard no-wallet message made wallet-agnostic
and names SafePal. No guessed SafePal deep-link scheme (unverified).

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

public/join-now.js

@@ -181,6 +181,9 @@ fetch('/api/public/config').then(function(r){return r.json()}).then(function(c){
     var here=location.host+location.pathname+location.search;
     var mm=$('mmDeep'); if(mm) mm.href='https://metamask.app.link/dapp/'+here;
     var tw=$('twDeep'); if(tw) tw.href='https://link.trustwallet.com/open_url?coin_id=966&url='+encodeURIComponent(location.href);
+    // Fill the "type this in your wallet's browser" hint with the sponsor's
+    // real join path so SafePal/Coinbase/etc. users land on the right page.
+    var wb=$('wbId'); if(wb){ var ref=new URLSearchParams(location.search).get('ref'); wb.parentNode.textContent='rmcircle.team'+(ref&&/^\d{1,15}$/.test(ref)?'/join/'+ref:'/join-now'); }
     box.style.display='block';
   }