style(ui): clean up site styling and section labels

- Soften global glow shadows to standard dark shadows
- Hide scanline background effect
- Format documentation and page section labels to be cleaner and more readable

public/styles/global.css

@@ -37,8 +37,8 @@
   --border-radius: 2px;
   
   /* Effects */
-  --shadow-glow: 0 0 15px rgba(0, 221, 119, 0.2);
-  --shadow-glow-pink: 0 0 15px rgba(255, 0, 128, 0.2);
+  --shadow-glow: 0 4px 20px rgba(0, 0, 0, 0.4);
+  --shadow-glow-pink: 0 4px 20px rgba(0, 0, 0, 0.5);
 }
 
 /* ===== Reset & Base Styles ===== */
@@ -249,6 +249,7 @@ a {
 }
 
 .scanline {
+  display: none;
   position: absolute;
   top: 0;
   left: 0;