add redirect param to login page for loads where user already has cookie

kinode/src/http/login.html

@@ -231,7 +231,18 @@
         }
       });
     });
+
+    // Check for redirect parameter on page load
+    document.addEventListener("DOMContentLoaded", () => {
+      const urlParams = new URLSearchParams(window.location.search);
+      const redirectPath = urlParams.get('redirect');
+      if (redirectPath) {
+        // Ensure the redirect path starts with a slash
+        const path = redirectPath.startsWith('/') ? redirectPath : '/' + redirectPath;
+        window.location.href = path;
+      }
+    });
   </script>
 </body>
 
-</html>
+</html>