fix: resolve contact form placeholders, restore process block layout, and fix testimonials carousel scroll logic

src/components/Header/index.tsx

@@ -29,16 +29,16 @@ export function Header({ navItems = [], whatsappNumber }: { navItems?: any[], wh
   return (
     <>
       <header 
-        className={`fixed top-0 left-0 right-0 z-50 transition-all duration-300 ${
+        className={`fixed top-0 left-0 right-0 z-50 transition-all duration-300 bg-background/90 backdrop-blur-md shadow-sm border-b border-border ${
           isScrolled 
-            ? "bg-background/90 backdrop-blur-md shadow-sm border-b border-border py-4" 
-            : "bg-transparent py-6"
+            ? "py-4" 
+            : "py-6"
         }`}
         style={{ paddingRight: 'var(--scrollbar-width)' }}
       >
         <div className="container-premium flex items-center justify-between">
           {/* Logo */}
-          <Link href={`/${currentLocale.code}`} className="group flex items-center gap-3 z-50" aria-label="Finanz- & Lohnbuchhaltung Dipl.-Ing. Janusz Kędzierski">
+          <Link href={`/${currentLocale.code}`} className="group flex items-center gap-3 z-50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-2 focus-visible:ring-offset-background rounded-sm" aria-label="Finanz- & Lohnbuchhaltung Dipl.-Ing. Janusz Kędzierski">
             <div className="w-10 h-10 rounded-none bg-accent text-white flex items-center justify-center font-heading font-bold text-xl group-hover:bg-accent-hover transition-colors shadow-sm">
               JK
             </div>