Add Frost feature: implement CSS and JS for frost effects and visibility toggle

Jellyfin.Plugin.Seasonals/Web/frost.css

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+.frost-container {
+    display: block;
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    pointer-events: none;
+    z-index: 10;
+    overflow: hidden;
+    contain: strict;
+}
+
+.frost-layer {
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    pointer-events: none;
+    /* A glowing white-blue gradient from edges */
+    background: radial-gradient(ellipse at center, transparent 60%, rgba(180, 220, 255, 0.4) 100%);
+    box-shadow: inset 0 0 60px rgba(200, 230, 255, 0.5), inset 0 0 120px rgba(255, 255, 255, 0.3);
+    
+    filter: url('#frost-filter');
+    
+    animation: frost-creep 4s ease-out forwards;
+}
+
+/* Subtle repeating star/crystal pattern */
+.frost-crystals {
+    position: absolute;
+    top: -5%;
+    left: -5%;
+    width: 110%;
+    height: 110%;
+    /* Use multi-layered star patterns for a random, crystalline spread */
+    background-image: 
+        url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="60" height="60"><circle cx="10" cy="10" r="1.5" fill="rgba(255,255,255,0.2)"/><circle cx="40" cy="30" r="1" fill="rgba(255,255,255,0.15)"/><circle cx="20" cy="50" r="2" fill="rgba(255,255,255,0.1)"/><path d="M50 10 L51 15 L56 16 L51 17 L50 22 L49 17 L44 16 L49 15 Z" fill="rgba(255,255,255,0.2)"/></svg>'),
+        url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40"><circle cx="5" cy="20" r="1" fill="rgba(255,255,255,0.15)"/><circle cx="25" cy="5" r="1.5" fill="rgba(255,255,255,0.1)"/><path d="M20 20 L21 23 L24 24 L21 25 L20 28 L19 25 L16 24 L19 23 Z" fill="rgba(255,255,255,0.15)"/></svg>'),
+        url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="30" height="30"><circle cx="15" cy="15" r="1" fill="rgba(255,255,255,0.2)"/><circle cx="5" cy="5" r="0.8" fill="rgba(255,255,255,0.1)"/></svg>');
+    background-repeat: repeat;
+    background-size: 110px 110px, 60px 60px, 30px 30px;
+    background-position: 0 0, 15px 15px, 5px 10px;
+    mix-blend-mode: overlay;
+    
+    /* Mask out the center so crystals only appear strongly on the edges */
+    -webkit-mask-image: radial-gradient(ellipse at center, transparent 50%, black 100%);
+    mask-image: radial-gradient(ellipse at center, transparent 50%, black 100%);
+    
+    animation: frost-shimmer 6s infinite alternate ease-in-out;
+}
+
+@keyframes frost-creep {
+    0% {
+        opacity: 0;
+        box-shadow: inset 0 0 10px rgba(200, 230, 255, 0);
+    }
+    100% {
+        opacity: 1;
+        box-shadow: inset 0 0 60px rgba(200, 230, 255, 0.5), inset 0 0 120px rgba(255, 255, 255, 0.3);
+    }
+}
+
+@keyframes frost-shimmer {
+    0% {
+        opacity: 0.4;
+        transform: scale(1);
+    }
+    100% {
+        opacity: 0.8;
+        transform: scale(1.02);
+    }
+}

Jellyfin.Plugin.Seasonals/Web/frost.js

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+const config = window.SeasonalsPluginConfig?.Frost || {};
+
+const frost = config.EnableFrost !== undefined ? config.EnableFrost : true;
+
+let msgPrinted = false;
+
+function toggleFrost() {
+    const container = document.querySelector('.frost-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('Frost hidden');
+            msgPrinted = true;
+        }
+    } else {
+        container.style.display = 'block';
+        if (msgPrinted) {
+            console.log('Frost visible');
+            msgPrinted = false;
+        }
+    }
+}
+
+const observer = new MutationObserver(toggleFrost);
+observer.observe(document.body, {
+  childList: true,
+  subtree: true,
+  attributes: true
+});
+
+function createFrost(container) {
+    const frostLayer = document.createElement('div');
+    frostLayer.className = 'frost-layer';
+
+    const frostCrystals = document.createElement('div');
+    frostCrystals.className = 'frost-crystals';
+    
+    // An SVG filter to make things look "frozen"/distorted around the edges
+    const svgFilter = document.createElement('div');
+    svgFilter.innerHTML = `
+        <svg style="display:none;">
+            <filter id="frost-filter">
+                <feTurbulence type="fractalNoise" baseFrequency="0.05" numOctaves="3" result="noise" />
+                <feDisplacementMap in="SourceGraphic" in2="noise" scale="5" xChannelSelector="R" yChannelSelector="G" />
+            </filter>
+        </svg>
+    `;
+    
+    frostLayer.appendChild(frostCrystals);
+    container.appendChild(frostLayer);
+    container.appendChild(svgFilter);
+}
+
+function initializeFrost() {
+    if (!frost) return;
+
+    const container = document.querySelector('.frost-container') || document.createElement("div");
+
+    if (!document.querySelector('.frost-container')) {
+        container.className = "frost-container";
+        container.setAttribute("aria-hidden", "true");
+        document.body.appendChild(container);
+    }
+    
+    createFrost(container);
+}
+
+initializeFrost();