added focus to first input field of modal

frontend/src/components/ConnectModal.tsx

@@ -25,6 +25,7 @@ export function ConnectModal({ serviceType, label, onClose, onSuccess }: Readonl
     if (!dialog) return
 
     dialog.showModal()
+    firstInputRef.current?.focus()
 
     const handleCancel = (e: Event) => {
       e.preventDefault()