Enhance CSS animations and performance across seasonal styles; add will-change property for smoother transitions and optimize keyframes. [skip ci]

Jellyfin.Plugin.Seasonals/Web/birthday.js

@@ -228,7 +228,19 @@ function createBirthday() {
                     // Ensure the burst container is appended to the main document body or the birthday container
                     createBalloonPopConfetti(document.body, cx, cy, balloonColors[randomItem]);
                 }
-            }, { once: true });
+            });
+
+            // Reset the balloon when it reappears at the bottom of the screen
+            symbol.addEventListener('animationiteration', function(e) {
+                // Ignore bubbling events from the inner sway animation
+                if (e.animationName === 'birthday-rise' || e.target === symbol) {
+                    if (innerDiv.classList.contains('popped')) {
+                        innerDiv.classList.remove('popped');
+                        innerDiv.style.animation = '';
+                        innerDiv.style.pointerEvents = 'auto';
+                    }
+                }
+            });
         }
 
         const startRot = (Math.random() * 20) - 10; // -10 to +10 spread