Extend feed wash across viewport

src/components/Feed.tsx

@@ -68,7 +68,7 @@ function FeedGlobeBackground() {
   return (
     <div className="fixed inset-0 z-0 pointer-events-none overflow-hidden bg-secondary/30" aria-hidden="true">
       <HeroAtmosphere hue={activeHue} fadeMs={FEED_BACKDROP_HUE_FADE_MS} className="opacity-55" />
-      <div className="absolute inset-0 bg-gradient-to-b from-background/15 via-background/30 to-background/80" />
+      <div className="absolute inset-0 bg-gradient-to-b from-background/10 via-background/20 to-background/55" />
       <div className="absolute inset-0 flex items-center justify-center">
         <HeroGlobe
           hue={activeHue}
@@ -76,7 +76,7 @@ function FeedGlobeBackground() {
           style={{ width: 'clamp(460px, 72dvw, 820px)' }}
         />
       </div>
-      <div className="absolute inset-0 bg-background/30" />
+      <div className="absolute inset-0 bg-background/70" />
     </div>
   );
 }