Add Mario Day feature: implement CSS and JS for Mario animations and visibility toggle

Jellyfin.Plugin.Seasonals/Web/marioday.css

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+.marioday-container {
+    display: block;
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    pointer-events: none;
+    z-index: 10000;
+    contain: strict;
+    overflow: hidden;
+}
+
+.mario-wrapper {
+    position: absolute;
+    bottom: 5px;
+    left: -100px;
+    animation: mario-run 15s linear infinite;
+    will-change: left, transform;
+}
+
+.mario-runner {
+    width: 64px;
+    height: auto;
+    image-rendering: crisp-edges;
+    image-rendering: pixelated;
+    display: block;
+    will-change: transform;
+}
+
+.mario-jump {
+    animation: jump-arc 0.8s ease-in-out;
+}
+
+/* 8-bit coin styling */
+.mario-coin {
+    position: absolute;
+    width: 32px;
+    height: 32px;
+    background-color: #ffd700;
+    border: 4px solid #b8860b;
+    border-radius: 50%;
+    box-shadow: inset 4px 4px 0 #fffbea, inset -4px -4px 0 #daa520;
+    animation: pop-up-arc 2s forwards;
+}
+
+.mario-coin::after {
+    content: '';
+    position: absolute;
+    top: 6px;
+    left: 10px;
+    width: 4px;
+    height: 12px;
+    background: #daa520;
+}
+
+@keyframes mario-run {
+    0% { left: -100px; transform: scaleX(1); }
+    45% { left: 110vw; transform: scaleX(1); }
+    50% { left: 110vw; transform: scaleX(-1); }
+    95% { left: -100px; transform: scaleX(-1); }
+    100% { left: -100px; transform: scaleX(1); }
+}
+
+@keyframes pop-up-arc {
+    0%   { transform: translateY(0) rotateY(0deg); opacity: 0; animation-timing-function: ease-out; }
+    20%  { opacity: 1; }
+    50%  { transform: translateY(-30vh) rotateY(360deg); opacity: 1; animation-timing-function: ease-in; }
+    90%  { opacity: 1; }
+    100% { transform: translateY(20vh) rotateY(720deg); opacity: 0; }
+}
+
+@keyframes jump-arc {
+    0%   { transform: translateY(0); }
+    50%  { transform: translateY(-25vh); }
+    100% { transform: translateY(0); }
+}

Jellyfin.Plugin.Seasonals/Web/marioday.js

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+const config = window.SeasonalsPluginConfig?.MarioDay || {};
+const marioday = config.EnableMarioDay !== undefined ? config.EnableMarioDay : true;
+
+let msgPrinted = false;
+
+function toggleMarioDay() {
+    const container = document.querySelector('.marioday-container');
+    if (!container) return;
+
+    const videoPlayer = document.querySelector('.videoPlayerContainer');
+    const trailerPlayer = document.querySelector('.youtubePlayerContainer');
+    const isDashboard = document.body.classList.contains('dashboardDocument');
+    const hasUserMenu = document.querySelector('#app-user-menu');
+
+    if (videoPlayer || trailerPlayer || isDashboard || hasUserMenu) {
+        container.style.display = 'none';
+        if (!msgPrinted) {
+            console.log('MarioDay hidden');
+            msgPrinted = true;
+        }
+    } else {
+        container.style.display = 'block';
+        if (msgPrinted) {
+            console.log('MarioDay visible');
+            msgPrinted = false;
+        }
+    }
+}
+
+const observer = new MutationObserver(toggleMarioDay);
+observer.observe(document.body, {
+  childList: true,
+  subtree: true,
+  attributes: true
+});
+
+
+function createMarioDay(container) {
+    const wrapper = document.createElement('div');
+    wrapper.className = 'mario-wrapper';
+
+    const mario = document.createElement('img');
+    mario.className = 'mario-runner';
+    mario.src = '../Seasonals/Resources/mario_assets/mario.gif';
+    
+    wrapper.appendChild(mario);
+    container.appendChild(wrapper);
+    
+    // Periodically throw out an 8-bit coin
+    setInterval(() => {
+        if (!document.querySelector('.marioday-container')) return;
+        const coin = document.createElement('div');
+        coin.className = 'mario-coin';
+        
+        // Grab Mario's current screen position to lock the coin's X coordinate
+        const marioRect = wrapper.getBoundingClientRect();
+        coin.style.left = `${marioRect.left + 16}px`;
+        coin.style.bottom = '35px'; // Adjust for wrapper's bottom offset
+        
+        container.appendChild(coin);
+        setTimeout(() => coin.remove(), 2000);
+
+    }, 4000);
+}
+
+
+function initializeMarioDay() {
+    if (!marioday) return;
+
+    const container = document.querySelector('.marioday-container') || document.createElement("div");
+
+    if (!document.querySelector('.marioday-container')) {
+        container.className = "marioday-container";
+        container.setAttribute("aria-hidden", "true");
+        document.body.appendChild(container);
+    }
+    
+    createMarioDay(container);
+    toggleMarioDay();
+}
+
+initializeMarioDay();