16be4b4afa
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>