fix: Hls.cast dead code, double-patch interceptors, manifest URL patterns

Hls.cast() is a TypeScript identity cast in hls.js — returns input unchanged,
NOT a reverse-lookup. Replaced with scanning video element properties for
HLS instance references real players store as custom properties.

Fixed double-patching bug in interceptors.js and expanded URL pattern
matching to cover /hls/, /playlist/, /manifest/, .hlsvod paths.

83/83 tests pass, clean build (9 modules).

src/inject/interceptors.js

@@ -34,6 +34,13 @@
     }
   }
 
+  // Helper: check if a URL looks like an HLS manifest
+  function isManifestUrl(url) {
+    var u = url.toLowerCase();
+    return u.includes('.m3u8') || u.includes('.hlsvod') ||
+           u.includes('/hls/') || u.includes('/playlist') || u.includes('/manifest');
+  }
+
   // Helper: report manifest to content script via postMessage
   function reportManifest(url, source) {
     var resolved = resolveUrl(url);
@@ -64,12 +71,7 @@
   XMLHttpRequest.prototype.send = function (_body) {
     if (this._goon_url && typeof this._goon_url === 'string') {
       var resolved = resolveUrl(this._goon_url);
-      if (
-        resolved &&
-        (resolved.includes('.m3u8') ||
-          resolved.includes('/playlist') ||
-          resolved.includes('/manifest'))
-      ) {
+      if (resolved && isManifestUrl(resolved)) {
         reportManifest(resolved, 'xhr');
       }
     }
@@ -82,12 +84,7 @@
     var url = typeof resource === 'string' ? resource : resource && resource.url;
     if (url && typeof url === 'string') {
       var resolved = resolveUrl(url);
-      if (
-        resolved &&
-        (resolved.includes('.m3u8') ||
-          resolved.includes('/playlist') ||
-          resolved.includes('/manifest'))
-      ) {
+      if (resolved && isManifestUrl(resolved)) {
         reportManifest(resolved, 'fetch');
       }
     }
@@ -95,8 +92,12 @@
   };
 
   // 3. Intercept HLS.js loadSource (catches HLS.js instances)
+  // Guard against double-patching: only wrap if the method hasn't been patched yet.
+  var hlsPatched = false;
   function patchHlsPrototype() {
     if (typeof Hls === 'undefined') return;
+    if (hlsPatched) return; // Already patched — skip
+
     var originalLoadSource = Hls.prototype.loadSource;
     if (!originalLoadSource) return;
 
@@ -115,6 +116,7 @@
         return originalAttachMedia.apply(this, arguments);
       };
     }
+    hlsPatched = true;
   }
 
   // Patch immediately if HLS is already defined
@@ -124,7 +126,6 @@
   // Use a combination of:
   // 1. Longer polling window (30s instead of 3s) to catch lazy-loaded players.
   // 2. MutationObserver on <head> for new <script> tags — catches late hls.js loads.
-  var hlsPatched = false;
   if (!hlsPatched) {
     var pollCount = 0;
     var maxPolls = 600; // poll for up to ~30s (50ms interval)
@@ -132,9 +133,8 @@
     var pollHls = setInterval(function () {
       pollCount++;
       if (typeof Hls !== 'undefined' && !hlsPatched) {
-        hlsPatched = true;
         patchHlsPrototype();
-        clearInterval(pollHls);
+        if (hlsPatched) clearInterval(pollHls);
       }
       if (pollCount >= maxPolls) clearInterval(pollHls);
     }, 50);
@@ -154,9 +154,8 @@
               if (src.includes('hls') || src.includes('videojs') || src.includes('player')) {
                 // Script tag loaded — check if Hls is now defined
                 if (typeof Hls !== 'undefined' && !hlsPatched) {
-                  hlsPatched = true;
                   patchHlsPrototype();
-                  observer.disconnect();
+                  if (hlsPatched) observer.disconnect();
                 }
               }
             }