Increase visibility of artist pattern background on desktop ads

Update the artist pattern background component by increasing the opacity and size of the artist names to improve visibility on dark backgrounds, and update gallery image URLs.

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client/src/components/artist-pattern-bg.tsx

@@ -35,8 +35,8 @@ export default function ArtistPatternBg({ children, className = "", seed = 42 }:
         name: ARTISTS[Math.floor(rng() * ARTISTS.length)],
         x: rng() * 100,
         y: (i / count) * 100 + (rng() - 0.5) * 8,
-        size: 9 + rng() * 9,
+        size: 10 + rng() * 10,
-        opacity: 0.03 + rng() * 0.05,
+        opacity: 0.06 + rng() * 0.09,
         rotation: -12 + rng() * 24,
         italic: rng() > 0.6,
       });