fix: support YouTube 2024+ data formats for playlists, podcasts and channels

- Add PODCAST content type support in lockupViewModel extraction
- Extract thumbnails and episode count from thumbnail overlay badges
- Migrate playlist page fetching from pbj=1 to innertube API (youtubei/v1/browse)
- Support new pageHeaderRenderer format in playlist metadata extraction
- Fix subscriber count extraction when YouTube returns handle instead of count
- Hide "None subscribers" in template when data is unavailable

youtube/yt_data_extract/common.py

@@ -241,7 +241,7 @@ def extract_lockup_view_model_info(item, additional_info={}):
     info['title'] = title_data.get('content', '')
 
     # Determine type based on contentType
-    if 'PLAYLIST' in content_type:
+    if 'PLAYLIST' in content_type or 'PODCAST' in content_type:
         info['type'] = 'playlist'
         info['playlist_type'] = 'playlist'
         info['id'] = content_id
@@ -253,7 +253,7 @@ def extract_lockup_view_model_info(item, additional_info={}):
         for row in metadata_rows.get('contentMetadataViewModel', {}).get('metadataRows', []):
             for part in row.get('metadataParts', []):
                 text = part.get('text', {}).get('content', '')
-                if 'video' in text.lower():
+                if 'video' in text.lower() or 'episode' in text.lower():
                     info['video_count'] = extract_int(text)
     elif 'VIDEO' in content_type:
         info['type'] = 'video'
@@ -276,25 +276,48 @@ def extract_lockup_view_model_info(item, additional_info={}):
         info['type'] = 'channel'
         info['id'] = content_id
         info['approx_subscriber_count'] = None
+        info['video_count'] = None
+
+        # Extract subscriber count and video count from metadata rows
+        metadata_rows = lockup_metadata.get('metadata', {})
+        for row in metadata_rows.get('contentMetadataViewModel', {}).get('metadataRows', []):
+            for part in row.get('metadataParts', []):
+                text = part.get('text', {}).get('content', '')
+                if 'subscriber' in text.lower():
+                    info['approx_subscriber_count'] = extract_approx_int(text)
+                elif 'video' in text.lower():
+                    info['video_count'] = extract_int(text)
     else:
         info['type'] = 'unsupported'
         return info
 
     # Extract thumbnail from contentImage
     content_image = item.get('contentImage', {})
-    collection_thumb = content_image.get('collectionThumbnailViewModel', {})
-    primary_thumb = collection_thumb.get('primaryThumbnail', {})
-    thumb_vm = primary_thumb.get('thumbnailViewModel', {})
-    image_sources = thumb_vm.get('image', {}).get('sources', [])
-    if image_sources:
-        info['thumbnail'] = image_sources[0].get('url', '')
-    else:
-        info['thumbnail'] = ''
+    info['thumbnail'] = normalize_url(multi_deep_get(content_image,
+        # playlists with collection thumbnail
+        ['collectionThumbnailViewModel', 'primaryThumbnail', 'thumbnailViewModel', 'image', 'sources', 0, 'url'],
+        # single thumbnail (some playlists, videos)
+        ['thumbnailViewModel', 'image', 'sources', 0, 'url'],
+    )) or ''
+
+    # Extract video/episode count from thumbnail overlay badges
+    # (podcasts and some playlists put the count here instead of metadata rows)
+    thumb_vm = multi_deep_get(content_image,
+        ['collectionThumbnailViewModel', 'primaryThumbnail', 'thumbnailViewModel'],
+        ['thumbnailViewModel'],
+    ) or {}
+    for overlay in thumb_vm.get('overlays', []):
+        for badge in deep_get(overlay, 'thumbnailOverlayBadgeViewModel', 'thumbnailBadges', default=[]):
+            badge_text = deep_get(badge, 'thumbnailBadgeViewModel', 'text', default='')
+            if badge_text and not info.get('video_count'):
+                conservative_update(info, 'video_count', extract_int(badge_text))
 
     # Extract author info if available
     info['author'] = None
     info['author_id'] = None
     info['author_url'] = None
+    info['description'] = None
+    info['badges'] = []
 
     # Try to get first video ID from inline player data
     item_playback = item.get('itemPlayback', {})
@@ -463,6 +486,13 @@ def extract_item_info(item, additional_info={}):
     elif primary_type == 'channel':
         info['id'] = item.get('channelId')
         info['approx_subscriber_count'] = extract_approx_int(item.get('subscriberCountText'))
+        # YouTube sometimes puts the handle (@name) in subscriberCountText
+        # instead of the actual count. Fall back to accessibility data.
+        if not info['approx_subscriber_count']:
+            acc_label = deep_get(item, 'subscriberCountText',
+                'accessibility', 'accessibilityData', 'label', default='')
+            if 'subscriber' in acc_label.lower():
+                info['approx_subscriber_count'] = extract_approx_int(acc_label)
     elif primary_type == 'show':
         info['id'] = deep_get(item, 'navigationEndpoint', 'watchEndpoint', 'playlistId')
         info['first_video_id'] = deep_get(item, 'navigationEndpoint',