⚠️ Fix most animations/transitions performance issues

- Basically add `will-change` to CSS elements to enable GPU animations, less choppy, more sassy
- Use requestAnimationFrame over setTimeout
- Avoid repaints AMAP

src/style/organisms/_fullscreen.scss

@@ -8,6 +8,10 @@
     overflow: hidden;
     pointer-events: none;
 
+    &, * {
+        will-change: transform, opacity;
+    }
+
     // Photo
     &__image {
         width: 100%;
@@ -17,7 +21,6 @@
         transform: scale(1.1);
         background: $color-primary;
         transition: transform 0.8s $ease-quart, opacity 0.8s $ease-quart;
-        will-change: transform, opacity;
 
         img {
             position: relative;
@@ -48,7 +51,6 @@
         opacity: 0;
         transform: scale(1.1) translateY(24px);
         transition: transform 0.8s $ease-quart, opacity 0.8s $ease-quart;
-        will-change: transform, opacity;
 
         // Visible state
         &.is-visible {
@@ -74,7 +76,6 @@
         background-color: $color-primary;
         border-radius: 100%;
         transition: transform 0.8s $ease-quart, opacity 0.8s $ease-quart;
-        will-change: transform, opacity;
 
         // Hidden state
         &.is-hidden {