feat(podcasts): render Podcasting-2.0 shows in detail + thread views

Make the single-podcast detail screen spec-neutral so a Podcasting-2.0
show (kind 30078, d=podcast-metadata, e.g. "Soapbox Sessions") renders
its real cover art and title instead of the default Amethyst banner and
"Podcasts" fallback:

- PodcastHeader/PodcastScreen now take a resolved PodcastShow? instead of
  a NIP-F4-only PodcastMetadataEvent?, resolving from either the kind
  10154 (F4) or kind 30078 (P2.0) metadata event.
- FilterOnePodcast adds a #d=podcast-metadata filter on kind 30078 so the
  P2.0 show metadata is actually fetched on deep-links/fresh loads.
- NoteMaster (thread/full view) now dispatches Podcasting20EpisodeEvent,
  Podcasting20TrailerEvent, and the kind 30078 podcast-metadata variant
  to the shared podcast renderers, matching NoteCompose.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JGa1EM5KWyDo1o5Yr6sS18

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/podcasts/PodcastHeader.kt

@@ -50,28 +50,35 @@ import com.vitorpamplona.amethyst.ui.theme.DividerThickness
 import com.vitorpamplona.amethyst.ui.theme.Size5dp
 import com.vitorpamplona.amethyst.ui.theme.grayText
 import com.vitorpamplona.quartz.nipF4Podcasts.metadata.PodcastMetadataEvent
+import com.vitorpamplona.quartz.podcasts.PodcastShow
 
 /**
  * Hero header for a single podcast screen: large cover art, title, websites and the show
  * description (rich text + translation, same as a profile's About), followed by the
  * "Episodes (N)" section divider that the episode rows hang under.
+ *
+ * Spec-neutral: [show] is either a NIP-F4 [PodcastMetadataEvent] (kind 10154) or a Podcasting-2.0
+ * show (kind 30078, `d=podcast-metadata`), both adapting to the shared [PodcastShow]. The claimed-
+ * author verification row is NIP-F4 only (its `p`-tag claims + kind:10064 counter-claims), so it's
+ * shown only when the underlying event is a [PodcastMetadataEvent].
  */
 @OptIn(ExperimentalLayoutApi::class)
 @Composable
 fun PodcastHeader(
     metadataNote: Note,
-    metadataEvent: PodcastMetadataEvent?,
+    show: PodcastShow?,
     episodeCount: Int?,
     accountViewModel: AccountViewModel,
     nav: INav,
 ) {
-    val title = remember(metadataEvent) { metadataEvent?.title() }
-    val image = remember(metadataEvent) { metadataEvent?.image() }
-    val description = remember(metadataEvent) { metadataEvent?.description() }
-    val websites = remember(metadataEvent) { metadataEvent?.websites() ?: emptyList() }
-    val claimedAuthors = remember(metadataEvent) { metadataEvent?.claimedAuthors() ?: emptyList() }
-    val podcastPubkey = remember(metadataEvent) { metadataEvent?.pubKey }
-    val tags = remember(metadataEvent) { metadataEvent?.tags?.toImmutableListOfLists() ?: EmptyTagList }
+    val title = remember(show) { show?.showTitle() }
+    val image = remember(show) { show?.showImage() }
+    val description = remember(show) { show?.showDescription() }
+    val websites = remember(show) { show?.showWebsites() ?: emptyList() }
+    val f4 = show as? PodcastMetadataEvent
+    val claimedAuthors = remember(f4) { f4?.claimedAuthors() ?: emptyList() }
+    val podcastPubkey = remember(f4) { f4?.pubKey }
+    val tags = remember(metadataNote) { metadataNote.event?.tags?.toImmutableListOfLists() ?: EmptyTagList }
 
     Column(Modifier.fillMaxWidth()) {
         PodcastCoverCard(image, metadataNote, accountViewModel)

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/podcasts/PodcastScreen.kt

@@ -61,8 +61,13 @@ import com.vitorpamplona.amethyst.ui.stringRes
 import com.vitorpamplona.amethyst.ui.theme.DividerThickness
 import com.vitorpamplona.amethyst.ui.theme.FeedPadding
 import com.vitorpamplona.amethyst.ui.theme.grayText
+import com.vitorpamplona.quartz.nip01Core.core.Address
+import com.vitorpamplona.quartz.nip78AppData.AppSpecificDataEvent
 import com.vitorpamplona.quartz.nipF4Podcasts.metadata.PodcastMetadataEvent
+import com.vitorpamplona.quartz.nipXXPodcasting20.metadata.Podcasting20PodcastMetadata
+import com.vitorpamplona.quartz.nipXXPodcasting20.metadata.resolvePodcastShow
 import com.vitorpamplona.quartz.nipXXPodcasting20.trailer.Podcasting20TrailerEvent
+import com.vitorpamplona.quartz.podcasts.PodcastShow
 
 @Composable
 fun PodcastScreen(
@@ -71,10 +76,18 @@ fun PodcastScreen(
     nav: INav,
 ) {
     val podcast = remember(pubkey) { LocalCache.checkGetOrCreateUser(pubkey) } ?: return
-    val metadataNote =
+    // A show is either NIP-F4 (kind 10154) or Podcasting-2.0 (kind 30078, d=podcast-metadata).
+    // Resolve both addresses; whichever has an event is this podcast's metadata.
+    val f4Note =
         remember(pubkey) {
             LocalCache.getOrCreateAddressableNote(PodcastMetadataEvent.createAddress(pubkey))
         }
+    val p20Note =
+        remember(pubkey) {
+            LocalCache.getOrCreateAddressableNote(
+                Address(AppSpecificDataEvent.KIND, pubkey, Podcasting20PodcastMetadata.PODCAST_METADATA_D_TAG),
+            )
+        }
 
     val feedViewModel: OnePodcastFeedViewModel =
         viewModel(
@@ -82,23 +95,27 @@ fun PodcastScreen(
             factory = OnePodcastFeedViewModel.Factory(pubkey, accountViewModel.account),
         )
 
-    PodcastScreen(podcast, metadataNote, feedViewModel, accountViewModel, nav)
+    PodcastScreen(podcast, f4Note, p20Note, feedViewModel, accountViewModel, nav)
 }
 
 @Composable
 fun PodcastScreen(
     podcast: User,
-    metadataNote: Note,
+    f4Note: Note,
+    p20Note: Note,
     feedViewModel: OnePodcastFeedViewModel,
     accountViewModel: AccountViewModel,
     nav: INav,
 ) {
     WatchLifecycleAndUpdateModel(feedViewModel)
-    // Fetches both the show metadata (kind 10154) and every episode (kind 54) authored by
-    // this podcast's key from its outbox relays.
+    // Fetches the show metadata (NIP-F4 kind 10154 / Podcasting-2.0 kind 30078) and every episode
+    // (kind 54 / kind 30054) + trailer authored by this podcast's key from its outbox relays.
     OnePodcastFilterAssemblerSubscription(podcast, accountViewModel)
 
-    val metadataEvent by observeNoteEvent<PodcastMetadataEvent>(metadataNote, accountViewModel)
+    val f4Event by observeNoteEvent<PodcastMetadataEvent>(f4Note, accountViewModel)
+    val p20Event by observeNoteEvent<AppSpecificDataEvent>(p20Note, accountViewModel)
+    val show: PodcastShow? = remember(f4Event, p20Event) { resolvePodcastShow(f4Event) ?: resolvePodcastShow(p20Event) }
+    val metadataNote = if (f4Event != null) f4Note else p20Note
 
     DisappearingScaffold(
         isInvertedLayout = false,
@@ -106,7 +123,7 @@ fun PodcastScreen(
             TopBarExtensibleWithBackButton(
                 title = {
                     Text(
-                        text = metadataEvent?.title() ?: stringRes(R.string.route_podcasts),
+                        text = show?.showTitle() ?: stringRes(R.string.route_podcasts),
                         maxLines = 1,
                         overflow = TextOverflow.Ellipsis,
                         modifier = Modifier.weight(1f),
@@ -121,7 +138,7 @@ fun PodcastScreen(
             SaveableFeedState(feedViewModel.feedState, scrollStateKey = null) { listState ->
                 PodcastScreenBody(
                     metadataNote = metadataNote,
-                    metadataEvent = metadataEvent,
+                    show = show,
                     feedViewModel = feedViewModel,
                     listState = listState,
                     accountViewModel = accountViewModel,
@@ -135,7 +152,7 @@ fun PodcastScreen(
 @Composable
 private fun PodcastScreenBody(
     metadataNote: Note,
-    metadataEvent: PodcastMetadataEvent?,
+    show: PodcastShow?,
     feedViewModel: OnePodcastFeedViewModel,
     listState: LazyListState,
     accountViewModel: AccountViewModel,
@@ -145,20 +162,20 @@ private fun PodcastScreenBody(
 
     when (val state = feedState) {
         is FeedState.Loaded ->
-            PodcastEpisodesList(metadataNote, metadataEvent, state, listState, accountViewModel, nav)
+            PodcastEpisodesList(metadataNote, show, state, listState, accountViewModel, nav)
 
         is FeedState.Empty ->
-            PodcastHeaderWithStatus(metadataNote, metadataEvent, listState, accountViewModel, nav) {
+            PodcastHeaderWithStatus(metadataNote, show, listState, accountViewModel, nav) {
                 StatusText(stringRes(R.string.podcast_no_episodes))
             }
 
         is FeedState.FeedError ->
-            PodcastHeaderWithStatus(metadataNote, metadataEvent, listState, accountViewModel, nav) {
+            PodcastHeaderWithStatus(metadataNote, show, listState, accountViewModel, nav) {
                 FeedError(state.errorMessage) { feedViewModel.invalidateData() }
             }
 
         is FeedState.Loading ->
-            PodcastHeaderWithStatus(metadataNote, metadataEvent, listState, accountViewModel, nav) {
+            PodcastHeaderWithStatus(metadataNote, show, listState, accountViewModel, nav) {
                 Box(Modifier.fillMaxWidth().padding(32.dp), contentAlignment = Alignment.Center) {
                     CircularProgressIndicator()
                 }
@@ -169,7 +186,7 @@ private fun PodcastScreenBody(
 @Composable
 private fun PodcastEpisodesList(
     metadataNote: Note,
-    metadataEvent: PodcastMetadataEvent?,
+    show: PodcastShow?,
     loaded: FeedState.Loaded,
     listState: LazyListState,
     accountViewModel: AccountViewModel,
@@ -184,7 +201,7 @@ private fun PodcastEpisodesList(
         item("header") {
             // The list mixes in trailers; the header count should reflect episodes only.
             val episodeCount = items.list.count { it.event !is Podcasting20TrailerEvent }
-            PodcastHeader(metadataNote, metadataEvent, episodeCount, accountViewModel, nav)
+            PodcastHeader(metadataNote, show, episodeCount, accountViewModel, nav)
         }
 
         itemsIndexed(
@@ -208,7 +225,7 @@ private fun PodcastEpisodesList(
 @Composable
 private fun PodcastHeaderWithStatus(
     metadataNote: Note,
-    metadataEvent: PodcastMetadataEvent?,
+    show: PodcastShow?,
     listState: LazyListState,
     accountViewModel: AccountViewModel,
     nav: INav,
@@ -219,7 +236,7 @@ private fun PodcastHeaderWithStatus(
         contentPadding = rememberFeedContentPadding(FeedPadding),
     ) {
         item("header") {
-            PodcastHeader(metadataNote, metadataEvent, null, accountViewModel, nav)
+            PodcastHeader(metadataNote, show, null, accountViewModel, nav)
         }
         item("status") { status() }
     }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/podcasts/datasource/FilterOnePodcast.kt

@@ -25,9 +25,11 @@ import com.vitorpamplona.amethyst.model.User
 import com.vitorpamplona.amethyst.service.relays.SincePerRelayMap
 import com.vitorpamplona.quartz.nip01Core.relay.client.pool.RelayBasedFilter
 import com.vitorpamplona.quartz.nip01Core.relay.filters.Filter
+import com.vitorpamplona.quartz.nip78AppData.AppSpecificDataEvent
 import com.vitorpamplona.quartz.nipF4Podcasts.episode.PodcastEpisodeEvent
 import com.vitorpamplona.quartz.nipF4Podcasts.metadata.PodcastMetadataEvent
 import com.vitorpamplona.quartz.nipXXPodcasting20.episode.Podcasting20EpisodeEvent
+import com.vitorpamplona.quartz.nipXXPodcasting20.metadata.Podcasting20PodcastMetadata
 import com.vitorpamplona.quartz.nipXXPodcasting20.trailer.Podcasting20TrailerEvent
 
 // A single-podcast screen fetches everything authored by the show's pubkey, across both drafts:
@@ -51,16 +53,31 @@ fun filterOnePodcast(
         user.outboxRelays()?.ifEmpty { null }
             ?: (user.allUsedRelays() + LocalCache.relayHints.hintsForKey(user.pubkeyHex))
 
-    return relays.map { relay ->
-        RelayBasedFilter(
-            relay = relay,
-            filter =
-                Filter(
-                    kinds = OnePodcastKinds,
-                    authors = listOf(user.pubkeyHex),
-                    limit = 500,
-                    since = since?.get(relay)?.time,
-                ),
+    return relays.flatMap { relay ->
+        listOf(
+            RelayBasedFilter(
+                relay = relay,
+                filter =
+                    Filter(
+                        kinds = OnePodcastKinds,
+                        authors = listOf(user.pubkeyHex),
+                        limit = 500,
+                        since = since?.get(relay)?.time,
+                    ),
+            ),
+            // Podcasting-2.0 show metadata rides on the generic NIP-78 app-data kind (30078),
+            // so it needs its own #d=podcast-metadata filter rather than a bare kind match.
+            RelayBasedFilter(
+                relay = relay,
+                filter =
+                    Filter(
+                        kinds = listOf(AppSpecificDataEvent.KIND),
+                        authors = listOf(user.pubkeyHex),
+                        tags = mapOf("d" to listOf(Podcasting20PodcastMetadata.PODCAST_METADATA_D_TAG)),
+                        limit = 1,
+                        since = since?.get(relay)?.time,
+                    ),
+            ),
         )
     }
 }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/threadview/ThreadFeedView.kt

@@ -220,6 +220,7 @@ import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.publicChannels.nip28PublicChat.PublicChatChannelHeader
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.utils.ThinSendButton
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.mockAccountViewModel
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.podcasts.PodcastTrailerListItem
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.threadview.dal.LevelFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.workouts.WorkoutDisplay
 import com.vitorpamplona.amethyst.ui.stringRes
@@ -324,6 +325,7 @@ import com.vitorpamplona.quartz.nip72ModCommunities.approval.CommunityPostApprov
 import com.vitorpamplona.quartz.nip72ModCommunities.communityAddress
 import com.vitorpamplona.quartz.nip72ModCommunities.isACommunityPost
 import com.vitorpamplona.quartz.nip75ZapGoals.GoalEvent
+import com.vitorpamplona.quartz.nip78AppData.AppSpecificDataEvent
 import com.vitorpamplona.quartz.nip7DThreads.ThreadEvent
 import com.vitorpamplona.quartz.nip84Highlights.HighlightEvent
 import com.vitorpamplona.quartz.nip87Ecash.cashu.CashuMintEvent
@@ -341,6 +343,9 @@ import com.vitorpamplona.quartz.nipC0CodeSnippets.CodeSnippetEvent
 import com.vitorpamplona.quartz.nipC7Chats.ChatEvent
 import com.vitorpamplona.quartz.nipF4Podcasts.episode.PodcastEpisodeEvent
 import com.vitorpamplona.quartz.nipF4Podcasts.metadata.PodcastMetadataEvent
+import com.vitorpamplona.quartz.nipXXPodcasting20.episode.Podcasting20EpisodeEvent
+import com.vitorpamplona.quartz.nipXXPodcasting20.metadata.Podcasting20PodcastMetadata
+import com.vitorpamplona.quartz.nipXXPodcasting20.trailer.Podcasting20TrailerEvent
 import kotlinx.collections.immutable.toImmutableList
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.runBlocking
@@ -832,8 +837,15 @@ private fun FullBleedNoteCompose(
                     RenderMusicPlaylist(baseNote, makeItShort = false, canPreview = true, backgroundColor, accountViewModel, nav)
                 } else if (noteEvent is PodcastEpisodeEvent) {
                     RenderPodcastEpisode(baseNote, makeItShort = false, canPreview = true, backgroundColor, accountViewModel, nav)
+                } else if (noteEvent is Podcasting20EpisodeEvent) {
+                    RenderPodcastEpisode(baseNote, makeItShort = false, canPreview = true, backgroundColor, accountViewModel, nav)
+                } else if (noteEvent is Podcasting20TrailerEvent) {
+                    PodcastTrailerListItem(baseNote, accountViewModel, nav)
                 } else if (noteEvent is PodcastMetadataEvent) {
                     RenderPodcastMetadata(baseNote, makeItShort = false, canPreview = true, backgroundColor, accountViewModel, nav)
+                } else if (noteEvent is AppSpecificDataEvent && noteEvent.dTag() == Podcasting20PodcastMetadata.PODCAST_METADATA_D_TAG) {
+                    // kind:30078 is overloaded; only the Podcasting-2.0 show-metadata variant renders as a podcast card.
+                    RenderPodcastMetadata(baseNote, makeItShort = false, canPreview = true, backgroundColor, accountViewModel, nav)
                 } else if (noteEvent is CommunityPostApprovalEvent) {
                     RenderPostApproval(
                         baseNote,