refactor: improve email verification handling in components

- Introduced a utility function to standardize email verification checks across EmailVerificationBanner and AccountSettingsPage.
- Updated conditional logic to enhance clarity and maintainability regarding email verification status.
- Ensured consistent treatment of various representations of email verification status in user profiles.

frontend/src/components/EmailVerificationBanner.jsx

@@ -1,6 +1,12 @@
 import { useState } from 'react'
 import api from '../utils/api'
 
+function isEmailVerifiedRow(p) {
+  if (!p) return false
+  const v = p.email_verified
+  return v === true || v === 't' || v === 1 || v === 'true'
+}
+
 /**
  * Hinweis + „Erneut senden“, wenn eingeloggt aber E-Mail noch nicht verifiziert (wie Mitai).
  */
@@ -9,7 +15,7 @@ export default function EmailVerificationBanner({ profile }) {
   const [success, setSuccess] = useState(false)
   const [error, setError] = useState('')
 
-  if (!profile?.email || profile.email_verified !== false) return null
+  if (!profile?.email || isEmailVerifiedRow(profile)) return null
 
   const handleResend = async () => {
     if (!profile.email) return

frontend/src/pages/AccountSettingsPage.jsx

@@ -22,7 +22,12 @@ function AccountSettingsPage() {
     setName(typeof user?.name === 'string' ? user.name : '')
   }, [user])
 
-  const verified = !!user?.email_verified
+  /** API: boolean true / Legacy: fehlt oder false → als „nicht verifiziert“ behandeln */
+  const emailExplicitlyVerified =
+    user?.email_verified === true ||
+    user?.email_verified === 't' ||
+    user?.email_verified === 1 ||
+    user?.email_verified === 'true'
 
   const showOk = (text) => {
     setMessage(text)
@@ -69,6 +74,7 @@ function AccountSettingsPage() {
     }
   }
 
+  const handleChangePassword = async (e) => {
     e.preventDefault()
     if (newPw1.length < 4) {
       showErr('Neues Passwort: mindestens 4 Zeichen.')
@@ -133,7 +139,7 @@ function AccountSettingsPage() {
           <strong style={{ color: 'var(--text1)' }}>E-Mail</strong>
           <br />
           {user?.email || '—'}{' '}
-          {verified ? (
+          {emailExplicitlyVerified ? (
             <span
               style={{
                 marginLeft: '0.5rem',
@@ -160,7 +166,7 @@ function AccountSettingsPage() {
               noch nicht bestätigt
             </span>
           )}
-          {!verified && user?.email ? (
+          {!emailExplicitlyVerified && user?.email ? (
             <div style={{ marginTop: '0.75rem' }}>
               <button
                 type="button"