Fix TradeRepublic review issues and Brakeman warning

app/javascript/controllers/traderepublic_reauth_controller.js

@@ -0,0 +1,21 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  static targets = ["buttonText", "spinner"]
+
+  submit(event) {
+    // Don't prevent default - let the form submit
+    
+    // Show spinner and update text
+    if (this.hasButtonTextTarget) {
+      this.buttonTextTarget.textContent = "Sending code..."
+    }
+    
+    if (this.hasSpinnerTarget) {
+      this.spinnerTarget.classList.remove("hidden")
+    }
+    
+    // Disable the button to prevent double-clicks
+    event.currentTarget.disabled = true
+  }
+}