fix(andreknie.de): normalize SEO metadata and document structure

privat/CV/andreknie.de/src/components/SEOHead.jsx

@@ -1,33 +1,32 @@
 import React from 'react'
 import { Helmet } from 'react-helmet-async'
+import { absoluteUrl, BRAND_SUFFIX, DEFAULT_DESCRIPTION, DEFAULT_IMAGE, DEFAULT_TITLE, normalizeTitle } from './seo.js'
 
-export default function SEOHead({ title, description, url, image, type = 'website' }) {
-  const defaultTitle = "Dr. André Knie - Experte für Digitale Souveränität"
-  const defaultDescription = "Dr. André Knie unterstützt Organisationen dabei, digitale Souveränität zu erlangen und sicher von KI zu profitieren."
-  
-  const siteTitle = title ? `${title} | Dr. André Knie` : defaultTitle
-  const siteDesc = description || defaultDescription
-  const siteUrl = url ? `https://andreknie.de${url}` : "https://andreknie.de"
-  const siteImage = image || "https://andreknie.de/images/og-image.webp"
+export default function SEOHead({ title, description, url, image, type = 'website', noindex = false }) {
+  const pageTitle = normalizeTitle(title)
+  const siteTitle = pageTitle === DEFAULT_TITLE ? pageTitle : `${pageTitle}${BRAND_SUFFIX}`
+  const siteDescription = description || DEFAULT_DESCRIPTION
+  const canonicalUrl = absoluteUrl(url || '/', '/')
+  const imageUrl = absoluteUrl(image, DEFAULT_IMAGE)
 
   return (
     <Helmet>
       <title>{siteTitle}</title>
-      <meta name="description" content={siteDesc} />
-      
-      {/* Open Graph / Facebook */}
-      <meta property="og:type" content={type} />
-      <meta property="og:url" content={siteUrl} />
-      <meta property="og:title" content={siteTitle} />
-      <meta property="og:description" content={siteDesc} />
-      <meta property="og:image" content={siteImage} />
+      <meta name="description" content={siteDescription} />
+      <link rel="canonical" href={canonicalUrl} />
+      {noindex && <meta name="robots" content="noindex,follow" />}
 
-      {/* Twitter */}
-      <meta property="twitter:card" content="summary_large_image" />
-      <meta property="twitter:url" content={siteUrl} />
-      <meta property="twitter:title" content={siteTitle} />
-      <meta property="twitter:description" content={siteDesc} />
-      <meta property="twitter:image" content={siteImage} />
+      <meta property="og:type" content={type} />
+      <meta property="og:url" content={canonicalUrl} />
+      <meta property="og:title" content={siteTitle} />
+      <meta property="og:description" content={siteDescription} />
+      <meta property="og:image" content={imageUrl} />
+
+      <meta name="twitter:card" content="summary_large_image" />
+      <meta name="twitter:url" content={canonicalUrl} />
+      <meta name="twitter:title" content={siteTitle} />
+      <meta name="twitter:description" content={siteDescription} />
+      <meta name="twitter:image" content={imageUrl} />
     </Helmet>
   )
 }

privat/CV/andreknie.de/src/components/SEOHead.test.jsx

@@ -0,0 +1,43 @@
+import React from 'react'
+import { afterEach, describe, expect, it } from 'vitest'
+import { render, cleanup } from '@testing-library/react'
+import { HelmetProvider } from 'react-helmet-async'
+import SEOHead from './SEOHead'
+import { BRAND_SUFFIX } from './seo.js'
+
+afterEach(() => {
+  cleanup()
+  document.head.querySelectorAll('[data-rh="true"]').forEach(node => node.remove())
+})
+
+describe('SEOHead', () => {
+  it('renders one branded title, description, and canonical link', () => {
+    render(
+      <HelmetProvider>
+        <SEOHead title={`Artikel${BRAND_SUFFIX}`} description="Synthetic description" url="/artikel" />
+      </HelmetProvider>,
+    )
+
+    expect(document.head.querySelectorAll('title')).toHaveLength(1)
+    expect(document.title).toBe(`Artikel${BRAND_SUFFIX}`)
+    expect(document.title.match(/Dr\. André Knie/g)).toHaveLength(1)
+    expect(document.head.querySelectorAll('meta[name="description"]')).toHaveLength(1)
+    expect(document.head.querySelector('link[rel="canonical"]')?.getAttribute('href')).toBe('https://andreknie.de/artikel')
+  })
+
+  it('normalizes relative and absolute image URLs', () => {
+    const { rerender } = render(
+      <HelmetProvider>
+        <SEOHead title="Test" image="/images/andre-knie.webp" />
+      </HelmetProvider>,
+    )
+
+    expect(document.head.querySelector('meta[property="og:image"]')?.getAttribute('content')).toBe('https://andreknie.de/images/andre-knie.webp')
+    rerender(
+      <HelmetProvider>
+        <SEOHead title="Test" image="https://cdn.example.invalid/image.webp" />
+      </HelmetProvider>,
+    )
+    expect(document.head.querySelector('meta[property="og:image"]')?.getAttribute('content')).toBe('https://cdn.example.invalid/image.webp')
+  })
+})

privat/CV/andreknie.de/src/components/seo.js

@@ -0,0 +1,16 @@
+export const SITE_URL = 'https://andreknie.de'
+export const BRAND_SUFFIX = ' | Dr. André Knie'
+export const DEFAULT_TITLE = 'Dr. André Knie – Digitale Souveränität und KI'
+export const DEFAULT_DESCRIPTION = 'Dr. André Knie unterstützt Organisationen dabei, digitale Souveränität zu erlangen und sicher von KI zu profitieren.'
+export const DEFAULT_IMAGE = '/images/andre-knie.webp'
+
+export function absoluteUrl(value, fallback) {
+  const candidate = value || fallback
+  if (/^https?:\/\//i.test(candidate)) return candidate
+  return new URL(candidate.startsWith('/') ? candidate : `/${candidate}`, SITE_URL).href
+}
+
+export function normalizeTitle(title) {
+  if (!title) return DEFAULT_TITLE
+  return title.endsWith(BRAND_SUFFIX) ? title.slice(0, -BRAND_SUFFIX.length) : title
+}