fix: add SSR-safe ScrollFadeIn component for scroll animations

ScrollFadeIn uses IntersectionObserver + CSS transitions instead of
Framer Motion's initial prop. Key difference: no inline style in SSR
HTML, so content is visible by default. Animation only activates
after client hydration (hasMounted check).

Wraps About, Projects, Contact, Footer in HomePageServer.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

app/_ui/HomePageServer.tsx

@@ -1,5 +1,6 @@
 import Header from "../components/Header.server";
 import Hero from "../components/Hero";
+import ScrollFadeIn from "../components/ScrollFadeIn";
 import Script from "next/script";
 import {
   getAboutTranslations,
@@ -78,7 +79,9 @@ export default async function HomePageServer({ locale }: HomePageServerProps) {
           </svg>
         </div>
 
-        <AboutClient locale={locale} translations={aboutT} />
+        <ScrollFadeIn>
+          <AboutClient locale={locale} translations={aboutT} />
+        </ScrollFadeIn>
 
         {/* Wavy Separator 2 - About to Projects */}
         <div className="relative h-24 overflow-hidden">
@@ -101,7 +104,9 @@ export default async function HomePageServer({ locale }: HomePageServerProps) {
           </svg>
         </div>
 
-        <ProjectsClient locale={locale} translations={projectsT} />
+        <ScrollFadeIn>
+          <ProjectsClient locale={locale} translations={projectsT} />
+        </ScrollFadeIn>
 
         {/* Wavy Separator 3 - Projects to Contact */}
         <div className="relative h-24 overflow-hidden">
@@ -124,9 +129,13 @@ export default async function HomePageServer({ locale }: HomePageServerProps) {
           </svg>
         </div>
 
-        <ContactClient locale={locale} translations={contactT} />
+        <ScrollFadeIn>
+          <ContactClient locale={locale} translations={contactT} />
+        </ScrollFadeIn>
       </main>
-      <FooterClient locale={locale} translations={footerT} />
+      <ScrollFadeIn>
+        <FooterClient locale={locale} translations={footerT} />
+      </ScrollFadeIn>
     </div>
   );
 }