fix(qa): resolve html validation errors and clean up unused dependencies

components/ContactContent.tsx

@@ -125,9 +125,9 @@ export default function Contact() {
                     <Mail size={24} />
                   </div>
                   <div className="relative z-10">
-                    <h4 className="text-slate-400 font-bold text-xs uppercase tracking-widest mb-1 md:mb-2">
+                    <h2 className="text-slate-400 font-bold text-xs uppercase tracking-widest mb-1 md:mb-2">
                       {t("info.email")}
-                    </h4>
+                    </h2>
                     <a
                       href="mailto:info@mb-grid-solutions.com"
                       className="text-white text-lg md:text-xl font-bold hover:text-accent transition-colors break-all"
@@ -144,9 +144,9 @@ export default function Contact() {
                     <MapPin size={24} />
                   </div>
                   <div className="relative z-10">
-                    <h4 className="text-slate-400 font-bold text-xs uppercase tracking-widest mb-1 md:mb-2">
+                    <h2 className="text-slate-400 font-bold text-xs uppercase tracking-widest mb-1 md:mb-2">
                       {t("info.address")}
-                    </h4>
+                    </h2>
                     <p className="text-white text-lg md:text-xl font-bold leading-relaxed">
                       {t("info.company")}
                       <br />
@@ -168,6 +168,7 @@ export default function Contact() {
                     scrolling="no"
                     marginHeight={0}
                     marginWidth={0}
+                    title="Location Map"
                     src="https://www.openstreetmap.org/export/embed.html?bbox=9.445,48.815,9.465,48.825&layer=mapnik&marker=48.8198,9.4552"
                   ></iframe>
                 </div>