The single-page downloader layout becomes the Downloads tab of a
SmoothTabWidget with Watch / Search / Feed / Browse / Downloads pages.
The init_ui edit is deliberately small (the old central widget is now
self.download_page); all new behavior lives in new modules:
- ytsage_gui_router.py: AppRouter signal hub (playVideo, queueVideo,
downloadVideo, openChannel, openPlaylist). A card's Download button
deep-links into the Downloads tab with the URL prefilled and analysis
started automatically.
- ytsage_gui_cards.py: VideoCard (thumbnail with disk cache under
APP_THUMBNAILS_DIR, title/channel/duration, Play/Queue/Download
actions, double-click to play) and VideoCardGrid (responsive grid,
Load more pagination).
- ytsage_gui_watch.py: WatchPage hosting the mpv PlayerPanel and a
drag-reorderable play queue with auto-advance on end of file.
- ytsage_gui_search.py: SearchPage running YtdlpClient.search off the
GUI thread with Load more pagination.
- Browse and Feed pages are placeholders, implemented next.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>