feat(relayauth): resolve real venue names in the auth prompt

The venue prompt said generic "this room"; now it names the actual place.
rememberVenueLabel resolves a public chat channel's title (by event id),
a live activity's title (by address), or a community's d-identifier (its
NIP-72 name), falling back to the address d-tag / short id when the venue
isn't cached. So the prompt reads "Post to nostr-dev?" / "Open <stream
title>?" with a matching consequence ("…your message to nostr-dev won't
be posted."), reusing the same who-slot as the person purposes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EZjmYpgHP4pf79Sav5QT8a

amethyst/src/main/java/com/vitorpamplona/amethyst/service/relayClient/authCommand/compose/RelayAuthPromptHost.kt

@@ -63,6 +63,7 @@ import com.vitorpamplona.amethyst.ui.note.ClickableUserPicture
 import com.vitorpamplona.amethyst.ui.note.UsernameDisplay
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
 import com.vitorpamplona.amethyst.ui.stringRes
+import com.vitorpamplona.quartz.nip01Core.core.Address
 import com.vitorpamplona.quartz.nip01Core.core.HexKey
 
 /** Above this many counterparties for a purpose, collapse the named rows into an avatar facepile. */
@@ -108,7 +109,14 @@ private fun RelayAuthPromptDialog(
     // The action the user was actually doing drives the title and the "if you don't" consequence,
     // so the out-of-context prompt reconnects to their intent.
     val primary = remember(prompt) { prompt.purposes.primaryNamed() }
-    val who = primary?.let { counterpartyLabel(it.counterparties, accountViewModel) }
+    val who =
+        primary?.let { p ->
+            when (p.kind) {
+                AuthPurposeKind.POST_VENUE, AuthPurposeKind.READ_VENUE ->
+                    p.venues.firstOrNull()?.let { rememberVenueLabel(it, accountViewModel) }
+                else -> counterpartyLabel(p.counterparties, accountViewModel)
+            }
+        }
     val showLabels = prompt.purposes.size > 1
 
     AlertDialog(
@@ -292,8 +300,8 @@ private fun titleFor(
         AuthPurposeKind.SEND_DM -> stringRes(R.string.relay_auth_title_send_dm, who ?: "")
         AuthPurposeKind.NOTIFY_INBOX -> stringRes(R.string.relay_auth_title_notify, who ?: "")
         AuthPurposeKind.READ_OUTBOX -> stringRes(R.string.relay_auth_title_read, who ?: "")
-        AuthPurposeKind.POST_VENUE -> stringRes(R.string.relay_auth_title_post_venue)
-        AuthPurposeKind.READ_VENUE -> stringRes(R.string.relay_auth_title_read_venue)
+        AuthPurposeKind.POST_VENUE -> stringRes(R.string.relay_auth_title_post_venue, who ?: "")
+        AuthPurposeKind.READ_VENUE -> stringRes(R.string.relay_auth_title_read_venue, who ?: "")
         else -> stringRes(R.string.relay_auth_prompt_title)
     }
 
@@ -306,8 +314,8 @@ private fun consequenceFor(
         AuthPurposeKind.SEND_DM -> stringRes(R.string.relay_auth_consequence_send_dm, who ?: "")
         AuthPurposeKind.NOTIFY_INBOX -> stringRes(R.string.relay_auth_consequence_notify, who ?: "")
         AuthPurposeKind.READ_OUTBOX -> stringRes(R.string.relay_auth_consequence_read, who ?: "")
-        AuthPurposeKind.POST_VENUE -> stringRes(R.string.relay_auth_consequence_post_venue)
-        AuthPurposeKind.READ_VENUE -> stringRes(R.string.relay_auth_consequence_read_venue)
+        AuthPurposeKind.POST_VENUE -> stringRes(R.string.relay_auth_consequence_post_venue, who ?: "")
+        AuthPurposeKind.READ_VENUE -> stringRes(R.string.relay_auth_consequence_read_venue, who ?: "")
         else -> null
     }
 
@@ -322,6 +330,27 @@ private fun counterpartyLabel(
     return if (pubkeys.size > 1) stringRes(R.string.relay_auth_name_and_others, name) else name
 }
 
+/**
+ * A display name for a venue id — a public chat channel (64-hex event id), a NIP-53 live activity,
+ * or a NIP-72 community. Uses the cached channel title where available (the venue is one we're
+ * actively using, so it's usually loaded), falling back to the address's d-identifier, which is the
+ * community name in NIP-72.
+ */
+@Composable
+private fun rememberVenueLabel(
+    venueId: String,
+    accountViewModel: AccountViewModel,
+): String =
+    remember(venueId) {
+        val resolved =
+            when {
+                venueId.length == 64 -> accountViewModel.getPublicChatChannelIfExists(venueId)?.toBestDisplayName()
+                venueId.startsWith("30311:") -> Address.parse(venueId)?.let { accountViewModel.getLiveActivityChannelIfExists(it)?.toBestDisplayName() }
+                else -> null
+            }
+        resolved ?: venueId.substringAfterLast(':').ifEmpty { venueId.take(8) }
+    }
+
 /** The best display name for [pubkey], reactive to metadata arriving from relays. */
 @Composable
 private fun rememberDisplayName(

amethyst/src/main/res/values/strings.xml

@@ -835,14 +835,14 @@
     <string name="relay_auth_title_send_dm">Send your message to %1$s?</string>
     <string name="relay_auth_title_notify">Notify %1$s?</string>
     <string name="relay_auth_title_read">Load posts from %1$s?</string>
-    <string name="relay_auth_title_post_venue">Post to this room?</string>
-    <string name="relay_auth_title_read_venue">Open this room?</string>
+    <string name="relay_auth_title_post_venue">Post to %1$s?</string>
+    <string name="relay_auth_title_read_venue">Open %1$s?</string>
     <!-- What happens if the user doesn\'t confirm, tied to what they were doing. %1$s is the person. -->
     <string name="relay_auth_consequence_send_dm">If you don\'t, your message to %1$s won\'t be delivered.</string>
     <string name="relay_auth_consequence_notify">If you don\'t, %1$s won\'t be notified about this.</string>
     <string name="relay_auth_consequence_read">If you don\'t, you won\'t see posts from %1$s here.</string>
-    <string name="relay_auth_consequence_post_venue">If you don\'t, your message won\'t be posted.</string>
-    <string name="relay_auth_consequence_read_venue">If you don\'t, you won\'t see it here.</string>
+    <string name="relay_auth_consequence_post_venue">If you don\'t, your message to %1$s won\'t be posted.</string>
+    <string name="relay_auth_consequence_read_venue">If you don\'t, you won\'t see %1$s here.</string>
     <string name="relay_auth_name_and_others">%1$s and others</string>
     <string name="relay_auth_reason_send_dm">Send your private message to:</string>
     <string name="relay_auth_reason_notify_inbox">Notify:</string>