fix: resolve HTML hierarchy, accessibility and PDF link issues

- Fix heading level skip in ContactContent success state (H3 -> H2)
- Clean up deprecated iframe attributes in ContactContent
- Add aria-label to footer logo link for WCAG compliance
- Rename PDF assets to hyphenated filenames to fix link checks
- Update AGB page with new PDF link format

app/[locale]/agb/page.tsx

@@ -13,22 +13,27 @@ export default function AVB() {
     .filter((b) => b !== "");
 
   // Extract title and stand more robustly
-  const title = rawBlocks.find(b => b.startsWith("# "))?.replace(/^#\s+/, "") || "Allgemeine Verkaufsbedingungen";
-  const stand = rawBlocks.find(b => b.toLowerCase().startsWith("stand:")) || "Stand: April 2026";
+  const title =
+    rawBlocks.find((b) => b.startsWith("# "))?.replace(/^#\s+/, "") ||
+    "Allgemeine Verkaufsbedingungen";
+  const stand =
+    rawBlocks.find((b) => b.toLowerCase().startsWith("stand:")) ||
+    "Stand: April 2026";
 
   const sections: { title: string; content: string[] }[] = [];
   let currentSection: { title: string; content: string[] } | null = null;
 
   // Process sections, skipping title and stand blocks
   rawBlocks.forEach((block) => {
-    if (block.startsWith("# ") || block.toLowerCase().startsWith("stand:")) return;
+    if (block.startsWith("# ") || block.toLowerCase().startsWith("stand:"))
+      return;
 
     if (block.startsWith("##")) {
       // New section header: e.g. "## 1. Geltungsbereich"
       if (currentSection) sections.push(currentSection);
-      currentSection = { 
-        title: block.replace(/^##\s+/, "").trim(), 
-        content: [] 
+      currentSection = {
+        title: block.replace(/^##\s+/, "").trim(),
+        content: [],
       };
     } else if (currentSection) {
       // Clean up bold markers for better display
@@ -39,7 +44,7 @@ export default function AVB() {
   if (currentSection) sections.push(currentSection);
 
   // The very last block might be a footer/schlussbestimmung if it's not in a section
-  // In our MD, everything is in a section, so we just use the last block of the last section as potential footer if we want, 
+  // In our MD, everything is in a section, so we just use the last block of the last section as potential footer if we want,
   // but the current UI expects a separate 'footer' variable.
   const footer = "MB Grid Solutions & Services";
 
@@ -55,7 +60,7 @@ export default function AVB() {
               <p className="text-slate-500 font-medium">{stand}</p>
             </div>
             <a
-              href="/assets/AVB MB Grid 4-2026.pdf"
+              href="/assets/avb-mb-grid-4-2026.pdf"
               download
               className="btn-primary !py-3 !px-6 flex items-center gap-2"
             >