fix: frame scroll fallback - nearest loaded frame on scroll

components/sections/CloudRevealSection.tsx

@@ -111,14 +111,18 @@ export default function CloudRevealSection() {
 
   // Scroll → canvas frame çiz
   useMotionValueEvent(scrollYProgress, 'change', (progress) => {
-    const frameIdx = Math.min(
+    const targetIdx = Math.min(
       Math.floor(progress * (TOTAL_FRAMES - 1)),
       TOTAL_FRAMES - 1
     )
-    const img = framesRef.current[frameIdx]
+    // Hedef frame yüklenmemişse geriye doğru ilk yüklü frame'i bul
+    let img: HTMLImageElement | null = null
+    for (let i = targetIdx; i >= 0; i--) {
+      if (framesRef.current[i]) { img = framesRef.current[i]; break }
+    }
     const canvas = canvasRef.current
     const ctx = canvas?.getContext('2d')
-    if (img && canvas && ctx) {
+    if (img && canvas && ctx && canvas.width > 0) {
       ctx.drawImage(img, 0, 0, canvas.width, canvas.height)
     }
   })