fix: improve HLS.js video detection and playback capture

- Add Hls.cast(video) detection (Strategy B1) — uses the official hls.js
  API to retrieve bound instances from <video> elements
- Add _goon_hls_manifest annotation check (Strategy B2) — reads interceptor-set
  manifest URLs directly on video elements
- Refactor scrapeFn to a 5-priority HLS detection chain:
  1. Direct .m3u8 in video.src
  2. Interceptor-set _goon_hls_manifest
  3. Hls.cast(video) official API
  4. Direct HTTP source (non-blob)
  5. Deep probe fallback (page globals/scripts)
- Replace fragile Object.defineProperty Hls detection with polling interval
  in interceptors.js — avoids conflicts with page JS
- Add buffered range tracking and duration to content.js video scan data
- Add 8 new tests for HLS detection priority chain (55 total)

src/viewer/index.js

@@ -138,6 +138,27 @@ function m3u8DeepProbeFn() {
   }
 
   // Strategy B: Video element HLS instances
+  // B1: Use Hls.cast(video) — the official hls.js API to get the bound instance
+  if (typeof Hls !== 'undefined' && typeof Hls.cast === 'function') {
+    for (const v of document.querySelectorAll('video')) {
+      try {
+        const hlsInst = Hls.cast(v);
+        if (hlsInst && hlsInst.url) {
+          if (!seen.has(hlsInst.url)) { seen.add(hlsInst.url); manifests.push({ url: hlsInst.url, player: 'Hls.cast' }); }
+        }
+      } catch { /* ignore */ }
+    }
+  }
+
+  // B2: Check interceptor-set manifest annotation on video elements
+  for (const v of document.querySelectorAll('video')) {
+    if (v._goon_hls_manifest && !seen.has(v._goon_hls_manifest)) {
+      seen.add(v._goon_hls_manifest);
+      manifests.push({ url: v._goon_hls_manifest, player: 'video._goon_hls_manifest' });
+    }
+  }
+
+  // B3: Fallback — walk video element keys looking for HLS-related objects
   for (const v of document.querySelectorAll('video')) {
     for (const key of Object.keys(v)) {
       if (key.toLowerCase().includes('hls') || key === 'player') {
@@ -200,12 +221,34 @@ function scrapeFn(hlsManifests) {
       let mediaType = 'video';
       let src = rawSrc;
 
+      // Priority 1: Direct .m3u8 source (rare but possible)
       if (rawSrc.includes('.m3u8') && rawSrc.startsWith('http')) {
         hlsManifest = rawSrc;
         mediaType = 'hls';
-      } else if (rawSrc.startsWith('http') && !rawSrc.startsWith('blob:')) {
+      }
+      // Priority 2: Interceptor annotation — Hls.attachMedia() patched by interceptors
+      else if (v._goon_hls_manifest) {
+        hlsManifest = v._goon_hls_manifest;
+        mediaType = 'hls';
+        src = hlsManifest;
+      }
+      // Priority 3: Hls.cast(video) — official hls.js API (works when Hls is loaded)
+      else if (typeof Hls !== 'undefined' && typeof Hls.cast === 'function') {
+        try {
+          const hlsInst = Hls.cast(v);
+          if (hlsInst && hlsInst.url) {
+            hlsManifest = hlsInst.url;
+            mediaType = 'hls';
+            src = hlsManifest;
+          }
+        } catch { /* ignore */ }
+      }
+      // Priority 4: Direct HTTP source (non-blob)
+      if (!hlsManifest && rawSrc.startsWith('http') && !rawSrc.startsWith('blob:')) {
         mediaType = 'video';
-      } else if (hlsManifests && hlsManifests.length > 0) {
+      }
+      // Priority 5: Deep probe fallback — use manifests found by scanning page globals/scripts
+      if (!hlsManifest && hlsManifests && hlsManifests.length > 0) {
         hlsManifest = hlsManifests[0].url || hlsManifests[0];
         mediaType = 'hls';
         src = hlsManifest;