feat: add playlists, queue, and favorites

src/FavoritesController.ts

src/PlaylistController.ts

src/QueueController.ts

src/constants.ts

src/main.ts

src/store/index.ts

src/types/IPodNotesSettings.ts

src/types/Playlist.ts

src/ui/PodcastView/EpisodeList.svelte

src/ui/PodcastView/EpisodeListItem.svelte

src/ui/PodcastView/PlaylistCard.svelte

src/ui/PodcastView/PodcastGrid.svelte

src/ui/PodcastView/PodcastGridCard.svelte

src/ui/PodcastView/PodcastView.svelte

src/ui/PodcastView/spawnEpisodeContextMenu.ts

src/ui/settings/PlaylistItem.svelte

src/ui/settings/PlaylistManager.svelte

src/ui/settings/PodNotesSettingsTab.ts