Enhance Navbar responsiveness and theming

- Refactor `MobileNav` with theme context support and improved animations.
- Adjust `DesktopNav` background behavior for better clarity.
- Update `Hero` image style with scaling for visual impact.

components/Home/Hero/Hero.tsx

@@ -16,7 +16,7 @@ const Hero = () => {
                     alt="Rhein river aerial view"
                     layout="fill"
                     objectFit="cover"
-                    className="blur-md"
+                    className="blur-md scale-105"
                     priority
                 />
                 {/* Dark overlay for better text contrast */}