Refactor CSS comments and improve observer configuration in spring.js for clarity

Jellyfin.Plugin.Seasonals/Web/spring.css

@@ -49,7 +49,7 @@
     transform-origin: bottom;
 }
 
-/* HTML Grass Overlayer */
+/* Grass Overlayer */
 .spring-grass {
     position: absolute;
     bottom: 0;
@@ -157,7 +157,6 @@
     z-index: 1002;
 }
 
-/* Generic Wrappers */
 .spring-anim-wrapper {
     position: fixed;
     z-index: 1001;
@@ -225,7 +224,7 @@
     100% { transform: translateY(0) rotate(0deg); }
 }
 
-/* Bee Buzz - Reduced Intensity */
+/* Bee Buzz */
 @keyframes spring-buzz {
     0% { transform: translate(0, 0); }
     25% { transform: translate(2px, -2px); }