feat: improve accessibility and SEO (100/100 Lighthouse score)

Fixes color contrast, canonical URLs, viewport scaling, semantic lists,

and resolves 404 errors for manifest/imgproxy.

components/home/WhyChooseUs.tsx

@@ -18,9 +18,9 @@ export default function WhyChooseUs() {
                 {t('subtitle')}
               </p>
 
-              <div className="mt-12 space-y-6">
+              <ul className="mt-12 space-y-6 list-none p-0">
                 {[0, 1, 2, 3].map((i) => (
-                  <div key={i} className="flex items-center gap-4">
+                  <li key={i} className="flex items-center gap-4">
                     <div className="flex-shrink-0 w-6 h-6 rounded-full bg-accent flex items-center justify-center">
                       <svg
                         className="w-4 h-4 text-primary-dark"
@@ -40,9 +40,9 @@ export default function WhyChooseUs() {
                     <span className="font-bold text-primary-dark text-base md:text-base">
                       {t(`features.${i}`)}
                     </span>
-                  </div>
+                  </li>
                 ))}
-              </div>
+              </ul>
             </div>
           </div>
           <ul className="lg:col-span-8 grid grid-cols-1 md:grid-cols-2 gap-8 order-2 lg:order-1 list-none p-0 m-0">