Informe SEO: vinted.nl

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Fix all SEO issues found in the audit of vinted.nl.

Prioritize high-severity issues first, then medium. For each fix, make the actual code change — don't just describe what to do.

```json
{
  "domain": "vinted.nl",
  "scores": {
    "overall": 80,
    "performance": 0,
    "seo": 78,
    "accessibility": 85,
    "bestPractices": 89,
    "security": 77
  },
  "findings": [
    {
      "module": "cookies",
      "severity": "medium",
      "title": "6 cookies missing Secure flag",
      "description": "Cookies without Secure flag can be sent over unencrypted HTTP connections",
      "recommendation": "Add the Secure attribute to all cookies to prevent transmission over HTTP"
    },
    {
      "module": "headers",
      "severity": "high",
      "title": "Missing strict-transport-security",
      "description": "HSTS header is missing. The site may be vulnerable to downgrade attacks.",
      "recommendation": "Add Strict-Transport-Security header with max-age of at least 31536000"
    },
    {
      "module": "headers",
      "severity": "medium",
      "title": "Missing content-security-policy",
      "description": "CSP header is missing. The site may be vulnerable to XSS attacks.",
      "recommendation": "Add a Content-Security-Policy header to restrict resource loading"
    },
    {
      "module": "headers",
      "severity": "medium",
      "title": "Missing x-content-type-options",
      "description": "X-Content-Type-Options is missing. MIME-sniffing attacks are possible.",
      "recommendation": "Add X-Content-Type-Options: nosniff header"
    },
    {
      "module": "headers",
      "severity": "medium",
      "title": "Missing x-frame-options",
      "description": "X-Frame-Options is missing. The site may be vulnerable to clickjacking.",
      "recommendation": "Add X-Frame-Options: DENY or SAMEORIGIN header"
    },
    {
      "module": "sitemap",
      "severity": "high",
      "title": "Missing sitemap.xml",
      "description": "No sitemap.xml found at the root",
      "recommendation": "Create a sitemap.xml to help search engines discover all pages"
    },
    {
      "module": "technology",
      "severity": "medium",
      "title": "Mixed content detected",
      "description": "4 resources loaded over HTTP on an HTTPS page",
      "recommendation": "Update all resource URLs to use HTTPS"
    },
    {
      "module": "content",
      "severity": "medium",
      "title": "Multiple H1 tags",
      "description": "Found 4 H1 tags (recommended: exactly 1)",
      "recommendation": "Use only one H1 per page; use H2-H6 for subsections"
    },
    {
      "module": "content",
      "severity": "medium",
      "title": "Thin content",
      "description": "Page has only 201 words (recommended: 300+)",
      "recommendation": "Add more meaningful content — aim for at least 300 words on key pages"
    },
    {
      "module": "content",
      "severity": "medium",
      "title": "Very low text-to-HTML ratio",
      "description": "Text/HTML ratio is 0% (recommended: >5%)",
      "recommendation": "Increase meaningful text content relative to HTML markup"
    },
    {
      "module": "content",
      "severity": "medium",
      "title": "Low keyword relevance",
      "description": "Only 25% of title keywords appear in body text",
      "recommendation": "Ensure the page content includes the keywords from the title"
    },
    {
      "module": "accessibility",
      "severity": "high",
      "title": "2 form fields without labels",
      "description": "Form inputs without associated labels are inaccessible",
      "recommendation": "Use <label for=\"id\"> or aria-label on every form field"
    },
    {
      "module": "brand-checker",
      "severity": "medium",
      "title": "No Organization schema",
      "description": "No Organization JSON-LD found",
      "recommendation": "Add Organization structured data with name, logo, and contact information"
    },
    {
      "module": "crawl-budget",
      "severity": "medium",
      "title": "No sitemap.xml found",
      "description": "sitemap.xml returned HTTP 404",
      "recommendation": "Create a sitemap.xml to help search engines discover all pages"
    },
    {
      "module": "page-experience",
      "severity": "high",
      "title": "Intrusive interstitials detected",
      "description": "Found 3 potential popup/overlay elements",
      "recommendation": "Reduce intrusive interstitials — they hurt mobile experience and can trigger Google penalties"
    },
    {
      "module": "log-analyzer",
      "severity": "medium",
      "title": "X-Powered-By header exposed",
      "description": "X-Powered-By: Next.js",
      "recommendation": "Remove the X-Powered-By header to reduce information leakage"
    }
  ]
}
```