Refactor birthday, olympia, space, and sports animations; enhance symbol management and visual effects

- Updated birthday.js to improve balloon visuals and confetti effects, including new color schemes and enhanced pop animations.
- Removed legacy fallback logic in olympia.js and improved image error handling.
- Enhanced space.js with configurable counts for planets, astronauts, satellites, ISS, and rockets; improved shooting star animations and added random image swapping.
- Simplified sports.js by removing legacy emoji fallback logic and optimizing ball creation based on selected categories.
- Adjusted CSS styles across birthday, olympia, space, and sports for better visual consistency and performance.
[skip ci]

Jellyfin.Plugin.Seasonals/Web/olympia.js

@@ -107,8 +107,7 @@ function createOlympia() {
             }
             img.src = `../Seasonals/Resources/olympic_assets/${imgName}`;
             img.onerror = function() {
-                this.style.display = 'none';
-                this.parentElement.innerHTML = getOlympiaEmojiFallback(randomItem);
+                symbol.remove();
             };
             innerDiv.appendChild(img);
             
@@ -244,13 +243,6 @@ function createOlympia() {
     }
 }
 
-function getOlympiaEmojiFallback(type) {
-    if (type === 'gold') return '🥇';
-    if (type === 'silver') return '🥈';
-    if (type === 'bronze') return '🥉';
-    return ''; // Rings will be handled by CSS or actual image
-}
-
 function initializeOlympia() {
   if (!olympia) return;
   createOlympia();