fix: widen hero glow gradient to prevent hard cutoff

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

Author: Fieldnote-Echo

docs/stylesheets/navi.css

@@ -216,9 +216,10 @@ body {
   content: '';
   position: absolute;
   top: 0;
-  left: 0;
-  right: 0;
-  height: 200px;
+  left: 50%;
+  transform: translateX(-50%);
+  width: 150%;
+  height: 100%;
   background: radial-gradient(
     ellipse at center top,
     rgba(126, 184, 168, 0.08) 0%,