Prompt for token on page load, cap max machines at 2

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server.js

@@ -326,6 +326,9 @@ app.get("/", (_req, res) => {
     return t.trim();
   }
 
+  // Prompt immediately on page load
+  if (!localStorage.getItem(KEY)) getToken();
+
   async function strip(file) {
     const token = getToken();
     if (!token) return;