Detect in-app browsers — the actual reason #34 could not connect

Janie's screenshot showed the X / chevron / share / kebab chrome of TELEGRAM'S
in-app browser, not Trust's DApp browser. She tapped her sponsor's link in a
Telegram chat, Telegram opened it in its own webview, and that webview can
never hold a wallet. The page said "no wallet in this browser", she said she
was using Trust — both true, completely at cross purposes.

Our advice made it worse: "open your wallet's browser and type the address" is
useless to someone whose whole reason for being on the page is that they
tapped a link.

Now we name the browser they are actually in — Telegram, Facebook, Instagram,
LINE, Messenger, X, or a generic Android WebView — say plainly that it cannot
hold a wallet and that this is not their fault, and give them the one useful
thing: a button that copies the address to the clipboard so they can paste it
into Trust. There is an execCommand fallback because older webviews have no
clipboard API, and leaving a button that silently does nothing would be worse
than not having one.

Detection deliberately requires the absence of window.ethereum before calling
something an in-app browser: wallet browsers ARE WebViews, and those are
exactly the ones that work. Verified against Telegram, Android WebView, Trust
(correctly ignored) and mobile Safari (correctly ignored).

This will hit far more members than Janie — every link tapped inside a chat
app lands in the same trap.

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

public/my.js

@@ -325,7 +325,7 @@
     const err=document.getElementById('msgAuthErr');
     try{
       const eth=await window.RMCWallet.pick();
-      if(!eth){err.textContent='This browser has no wallet in it. Open this page INSIDE your wallet app instead: open Trust, MetaMask, SafePal or Coinbase, find its Browser (or DApps) tab, and type  rmcircle.team/my  into that address bar. On iPhone, Trust no longer has a browser — use MetaMask or SafePal, or ask your sponsor to link you instead.';return;}
+      if(!eth){{var _ia=(window.RMCInApp&&window.RMCInApp.notice('/my'))||'';if(_ia){err.innerHTML=_ia;if(err.style)err.style.display='block';window.RMCInApp.bind('/my');}else{err.textContent='This browser has no wallet in it. Open this page INSIDE your wallet app instead: open Trust, MetaMask, SafePal or Coinbase, find its Browser (or DApps) tab, and type  rmcircle.team/my  into that address bar. On iPhone, Trust no longer has a browser — use MetaMask or SafePal, or ask your sponsor to link you instead.';}}return;}
       const accs=await eth.request({method:'eth_requestAccounts'});const account=accs[0];
       // Match the wallet's active chain to the SIWE message's Chain ID (137),
       // or the wallet rejects the signature ("chain ID does not match").