feat(ui): finalize E-TIB modernization with footer redesign, video optimization, and TS fixes

Former-commit-id: 67ac02c8404cc66893fdf97308574701cca6000c

app/[locale]/not-found.tsx

@@ -13,8 +13,9 @@ export default async function NotFound() {
 
   return (
     <>
+      <script dangerouslySetInnerHTML={{ __html: `document.body.setAttribute('data-force-solid-header', 'true');` }} />
       <ClientNotFoundTracker path="" />
-      <Container className="relative py-24 flex flex-col items-center justify-center text-center min-h-[70vh] overflow-hidden">
+      <Container className="relative py-32 mt-16 flex flex-col items-center justify-center text-center min-h-[70vh] overflow-hidden">
         {/* Industrial Background Element */}
         <div className="absolute inset-0 -z-10 opacity-[0.03] pointer-events-none flex items-center justify-center">
           <span className="text-[20rem] font-bold select-none">404</span>
@@ -34,7 +35,7 @@ export default async function NotFound() {
           {t('title')}
         </Heading>
 
-        <p className="text-text-secondary mb-10 max-w-md text-lg">{t('description')}</p>
+        <p className="text-text-secondary mb-10 max-w-md text-lg mx-auto">{t('description')}</p>
 
         {suggestedUrl && (
           <div className="mb-12 p-6 bg-accent/10 border border-accent/20 rounded-2xl animate-fade-in shadow-lg relative overflow-hidden group">
@@ -53,7 +54,7 @@ export default async function NotFound() {
           </div>
         )}
 
-        <div className="flex flex-col sm:flex-row gap-4">
+        <div className="flex flex-col sm:flex-row gap-4 justify-center">
           <Button href="/" variant={suggestedUrl ? 'outline' : 'accent'} size="lg">
             {t('cta')}
           </Button>
@@ -62,7 +63,6 @@ export default async function NotFound() {
           </Button>
         </div>
 
-        {/* Decorative Industrial Line */}
         <div className="absolute bottom-0 left-1/2 -translate-x-1/2 w-px h-24 bg-gradient-to-t from-accent/50 to-transparent" />
       </Container>
     </>