fix: improve smooth scroll with ease-out deceleration

- Changed from linear to ease-out cubic easing function
- Scroll now starts immediately at full speed (no initial delay)
- Gradually decelerates as it approaches the target anchor
- Provides more natural and responsive scrolling experience

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

apps/website/composables/useSmoothScroll.ts

@@ -13,9 +13,9 @@ export const useSmoothScroll = () => {
     window.removeEventListener('keydown', cancelScroll)
   }
 
-  // Linear easing for constant-speed scrolling
-  const easeLinear = (t: number): number => {
-    return t
+  // Ease-out cubic: starts fast, slows down as it approaches target
+  const easeOutCubic = (t: number): number => {
+    return 1 - Math.pow(1 - t, 3)
   }
 
   const smoothScrollTo = (target: number | Element, duration: number = 800) => {
@@ -43,7 +43,7 @@ export const useSmoothScroll = () => {
       if (startTime === null) startTime = currentTime
       const timeElapsed = currentTime - startTime
       const progress = Math.min(timeElapsed / duration, 1)
-      const easedProgress = easeLinear(progress)
+      const easedProgress = easeOutCubic(progress)
 
       window.scrollTo(0, startPosition + distance * easedProgress)