Reduce noise glow intensity on light theme

Lower light-theme boost from 2.2x to 1.5x for subtler background shapes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/wled_controller/static/js/core/bg-anim.js

@@ -73,7 +73,7 @@ void main() {
     float colorMix = n2 * 0.5 + 0.5;
     vec3 color = mix(col1, col2, colorMix);
 
-    float boost = 1.0 + u_light * 1.2; // 1.0 dark, 2.2 light
+    float boost = 1.0 + u_light * 0.5; // 1.0 dark, 1.5 light
 
     // Noise background: additive glow on dark, tint toward accent on light
     vec3 noiseDark  = mix(u_bg, u_bg + color * 0.6, glow * 0.14);