fix: remove scanline and vignette overlays from 404

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

layouts/404.html

@@ -55,46 +55,8 @@
     60% { transform: skew(-0.5deg); }
   }
 
-  /* Scanline overlay */
-  .scanlines {
-    position: fixed;
-    inset: 0;
-    pointer-events: none;
-    z-index: 10;
-    background: repeating-linear-gradient(
-      0deg,
-      rgba(0, 0, 0, 0.1) 0px,
-      rgba(0, 0, 0, 0.1) 1px,
-      transparent 1px,
-      transparent 2px
-    );
-    animation: scanline-flicker 0.1s infinite;
-  }
-
-  @keyframes scanline-flicker {
-    0%, 100% { opacity: 0.8; }
-    50% { opacity: 0.85; }
-  }
-
-  /* CRT vignette effect */
-  .vignette {
-    position: fixed;
-    inset: 0;
-    pointer-events: none;
-    z-index: 9;
-    background: radial-gradient(
-      ellipse at center,
-      transparent 0%,
-      transparent 60%,
-      rgba(0, 0, 0, 0.4) 100%
-    );
-  }
-
 </style>
 
-<div class="scanlines"></div>
-<div class="vignette"></div>
-
 <section class="min-h-screen flex flex-col items-center justify-center px-4 relative z-20">
   <div class="text-center">
     <h1 class="glitch font-mono" data-text="404">404</h1>