Fix YouTube embeds and improve global chat auto-scroll

components/Media.js

@@ -26,11 +26,10 @@ const videoIdF = (content) => {
 
 // Extract YouTube video ID from content string
 const youtubeIdF = (content) => {
-    let youtubeTag = content.match(/@youtube:[0-z]+/);
+    // Accept classic 11-char IDs and common ID-safe chars.
+    let youtubeTag = content.match(/@youtube:([A-Za-z0-9_-]+)/);
     if (!youtubeTag) return '';
-    let tag = youtubeTag;
-    tag = tag[0].substring(1);
-    return tag.split(':')[1];
+    return youtubeTag[1];
 };
 
 // Extract HLS URL from content string
@@ -174,7 +173,13 @@ let Media = (props) => {
             return (
                 <WebView
                     style={styles.iframe}
-                    source={{ uri: "https://www.youtube.com/embed/" + youtubeId + "?fs=0" }}
+                    source={{
+                        uri: "https://www.youtube.com/embed/" + youtubeId + "?fs=0",
+                        headers: {
+                            Referer: "https://social.emmint.com",
+                            "Referrer-Policy": "strict-origin-when-cross-origin",
+                        },
+                    }}
                 />
             );
         }