refactor: migrate browser scripts to ts

static/ts/auth.ts

@@ -0,0 +1,25 @@
+function copyRecoveryKey(keyElementId: string, feedbackElementId: string): void {
+  const keyElement = document.getElementById(keyElementId)
+  const feedbackElement = document.getElementById(feedbackElementId)
+
+  if (!keyElement || !feedbackElement) {
+    return
+  }
+
+  const key = keyElement.textContent || ''
+  navigator.clipboard
+    .writeText(key)
+    .then((): void => {
+      feedbackElement.textContent = 'Recovery key copied.'
+    })
+    .catch((): void => {
+      feedbackElement.textContent = 'Copy failed. Select and copy manually.'
+    })
+}
+
+function confirmDangerAction(message: string): boolean {
+  return window.confirm(message)
+}
+
+;(window as Window & { copyRecoveryKey?: typeof copyRecoveryKey; confirmDangerAction?: typeof confirmDangerAction }).copyRecoveryKey = copyRecoveryKey
+;(window as Window & { copyRecoveryKey?: typeof copyRecoveryKey; confirmDangerAction?: typeof confirmDangerAction }).confirmDangerAction = confirmDangerAction