live stream support

frontend/js/state.js

@@ -27,3 +27,23 @@ App.constants = {
     FAVORITES_VISIBILITY_KEY: 'favoritesVisible',
     PREFERRED_QUALITY_KEY: 'preferredQuality'
 };
+
+// Lazily injects hls.js the first time a stream actually needs it. Sessions
+// that only browse thumbnails, or that play native/MP4, never download it.
+// Resolves with window.Hls (or null if loading failed).
+App.ensureHls = function() {
+    if (window.Hls) return Promise.resolve(window.Hls);
+    if (App._hlsPromise) return App._hlsPromise;
+    App._hlsPromise = new Promise((resolve, reject) => {
+        const script = document.createElement('script');
+        script.src = 'https://cdn.jsdelivr.net/npm/hls.js@1.5';
+        script.async = true;
+        script.onload = () => resolve(window.Hls || null);
+        script.onerror = () => {
+            App._hlsPromise = null;
+            reject(new Error('Failed to load hls.js'));
+        };
+        document.head.appendChild(script);
+    });
+    return App._hlsPromise;
+};