feat: implement NIP-7D thread events (kind 11)

Add support for NIP-7D thread events with title rendering in both
NoteCompose (feed view) and ThreadFeedView (detail view). Replies
use existing NIP-22 kind 1111 comments.

https://claude.ai/code/session_01MR2hLpmq3pkzzT11t86dAt

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip7DThreads/TagArrayBuilderExt.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip7DThreads
+
+import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.nip23LongContent.tags.TitleTag
+
+fun TagArrayBuilder<ThreadEvent>.title(title: String) = addUnique(TitleTag.assemble(title))

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip7DThreads/TagArrayExt.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip7DThreads
+
+import com.vitorpamplona.quartz.nip01Core.core.TagArray
+import com.vitorpamplona.quartz.nip23LongContent.tags.TitleTag
+
+fun TagArray.title() = firstNotNullOfOrNull(TitleTag::parse)

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip7DThreads/ThreadEvent.kt

@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nip7DThreads
+
+import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.nip01Core.core.Event
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.nip01Core.signers.eventTemplate
+import com.vitorpamplona.quartz.nip22Comments.RootScope
+import com.vitorpamplona.quartz.nip31Alts.alt
+import com.vitorpamplona.quartz.nip50Search.SearchableEvent
+import com.vitorpamplona.quartz.utils.TimeUtils
+
+@Immutable
+class ThreadEvent(
+    id: HexKey,
+    pubKey: HexKey,
+    createdAt: Long,
+    tags: Array<Array<String>>,
+    content: String,
+    sig: HexKey,
+) : Event(id, pubKey, createdAt, KIND, tags, content, sig),
+    RootScope,
+    SearchableEvent {
+    override fun indexableContent() = "title: " + title() + "\n" + content
+
+    fun title() = tags.title()
+
+    companion object {
+        const val KIND = 11
+        const val ALT_DESCRIPTION = "Thread"
+
+        fun build(
+            content: String,
+            title: String,
+            createdAt: Long = TimeUtils.now(),
+            initializer: TagArrayBuilder<ThreadEvent>.() -> Unit = {},
+        ) = eventTemplate(KIND, content, createdAt) {
+            alt(ALT_DESCRIPTION)
+            title(title)
+            initializer()
+        }
+    }
+}

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/utils/EventFactory.kt

@@ -154,6 +154,7 @@ import com.vitorpamplona.quartz.nip72ModCommunities.definition.CommunityDefiniti
 import com.vitorpamplona.quartz.nip72ModCommunities.follow.CommunityListEvent
 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.nip85TrustedAssertions.addressables.AddressableAssertionEvent
 import com.vitorpamplona.quartz.nip85TrustedAssertions.events.EventAssertionEvent
@@ -348,6 +349,7 @@ class EventFactory {
                 SearchRelayListEvent.KIND -> SearchRelayListEvent(id, pubKey, createdAt, tags, content, sig)
                 StatusEvent.KIND -> StatusEvent(id, pubKey, createdAt, tags, content, sig)
                 TextNoteEvent.KIND -> TextNoteEvent(id, pubKey, createdAt, tags, content, sig)
+                ThreadEvent.KIND -> ThreadEvent(id, pubKey, createdAt, tags, content, sig)
                 TextNoteModificationEvent.KIND -> TextNoteModificationEvent(id, pubKey, createdAt, tags, content, sig)
                 TokenEvent.KIND -> TokenEvent(id, pubKey, createdAt, tags, content, sig)
                 TorrentEvent.KIND -> TorrentEvent(id, pubKey, createdAt, tags, content, sig)