Add Film Noir feature: implement CSS and JS for film noir effects and toggle functionality

Jellyfin.Plugin.Seasonals/Web/filmnoir.css

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+.filmnoir-tint {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100vw;
+    height: 100vh;
+    pointer-events: none;
+    z-index: 10000;
+    background-color: #8c7355;
+    mix-blend-mode: color;
+}
+
+.filmnoir-effects {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100vw;
+    height: 100vh;
+    pointer-events: none;
+    z-index: 1100;
+}
+
+/* Film grain */
+.filmnoir-grain {
+    position: absolute;
+    top: -50%;
+    left: -50%;
+    width: 200%;
+    height: 200%;
+    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200"><filter id="n"><feTurbulence type="fractalNoise" baseFrequency="0.8" numOctaves="3" stitchTiles="stitch"/></filter><rect width="200" height="200" filter="url(%23n)" opacity="0.4"/></svg>');
+    animation: grain-dance 0.2s steps(4) infinite;
+    pointer-events: none;
+    mix-blend-mode: overlay;
+    opacity: 0.3;
+}
+
+/* Vignette */
+.filmnoir-vignette {
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    pointer-events: none;
+    background: radial-gradient(circle at center, transparent 50%, rgba(0,0,0,0.8) 120%);
+    box-shadow: inset 0 0 100px rgba(0,0,0,0.6);
+}
+
+/* Occasional flicker and scratch */
+.filmnoir-scratches {
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    pointer-events: none;
+    background: linear-gradient(to right, transparent 50%, rgba(255,255,255,0.2) 51%, transparent 52%);
+    background-size: 200% 100%;
+    animation: scratch 4s infinite linear, flicker 6s infinite alternate;
+    opacity: 0.2;
+    mix-blend-mode: screen;
+}
+
+@keyframes grain-dance {
+    0% { transform: translate(0,0); }
+    25% { transform: translate(-5%,-5%); }
+    50% { transform: translate(-10%,5%); }
+    75% { transform: translate(5%,-10%); }
+    100% { transform: translate(0,0); }
+}
+
+@keyframes scratch {
+    0% { background-position: -200% 0; }
+    10% { background-position: 200% 0; }
+    100% { background-position: 200% 0; }
+}
+
+@keyframes flicker {
+    0% { opacity: 0.2; }
+    5% { opacity: 0.1; }
+    10% { opacity: 0.3; }
+    15% { opacity: 0.2; }
+    50% { opacity: 0.15; }
+    55% { opacity: 0.25; }
+    100% { opacity: 0.2; }
+}

Jellyfin.Plugin.Seasonals/Web/filmnoir.js

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+const config = window.SeasonalsPluginConfig?.FilmNoir || {};
+const filmnoir = config.EnableFilmNoir !== undefined ? config.EnableFilmNoir : true;
+
+let msgPrinted = false;
+
+function toggleFilmNoir() {
+    const tint = document.querySelector('.filmnoir-tint');
+    const effects = document.querySelector('.filmnoir-effects');
+    if (!tint || !effects) 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) {
+        tint.style.display = 'none';
+        effects.style.display = 'none';
+        if (!msgPrinted) {
+            console.log('FilmNoir hidden');
+            msgPrinted = true;
+        }
+    } else {
+        tint.style.display = 'block';
+        effects.style.display = 'block';
+        if (msgPrinted) {
+            console.log('FilmNoir visible');
+            msgPrinted = false;
+        }
+    }
+}
+
+const observer = new MutationObserver(toggleFilmNoir);
+observer.observe(document.body, {
+  childList: true,
+  subtree: true,
+  attributes: true
+});
+
+
+function createFilmNoir() {
+    if (!document.querySelector('.filmnoir-tint')) {
+        const tint = document.createElement('div');
+        tint.className = 'filmnoir-tint';
+        tint.setAttribute('aria-hidden', 'true');
+        document.body.appendChild(tint);
+    }
+
+    let effects = document.querySelector('.filmnoir-effects');
+    if (!effects) {
+        effects = document.createElement('div');
+        effects.className = 'filmnoir-effects';
+        effects.setAttribute('aria-hidden', 'true');
+        document.body.appendChild(effects);
+
+        const vignette = document.createElement('div');
+        vignette.className = 'filmnoir-vignette';
+
+        const grain = document.createElement('div');
+        grain.className = 'filmnoir-grain';
+
+        const scratches = document.createElement('div');
+        scratches.className = 'filmnoir-scratches';
+
+        effects.appendChild(grain);
+        effects.appendChild(scratches);
+        effects.appendChild(vignette);
+    }
+}
+
+
+function initializeFilmNoir() {
+    if (!filmnoir) return;
+    
+    createFilmNoir();
+    toggleFilmNoir();
+}
+
+initializeFilmNoir();