refactor: buildHashtagLabel takes an EventHintBundle

Replace the labeledEventId/relay/author trio with a single
EventHintBundle<out Event>, building the e-tag via the standard
EventHintBundle.toETag() idiom. The Account caller now passes the
note's event hint directly.

https://claude.ai/code/session_019gc3FipVBcndF9fmqCCfVX

amethyst/src/main/java/com/vitorpamplona/amethyst/model/Account.kt

@@ -769,13 +769,7 @@ class Account(
 
         val eventHint = note.toEventHint<Event>() ?: return null
 
-        val template =
-            LabelEvent.buildHashtagLabel(
-                labeledEventId = eventHint.event.id,
-                labeledEventRelay = eventHint.relay?.url,
-                labeledEventAuthor = eventHint.event.pubKey,
-                hashtag = hashtag,
-            )
+        val template = LabelEvent.buildHashtagLabel(eventHint, hashtag)
 
         val event = signer.sign(template)
         val relays = computeRelayListToBroadcast(event)

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip32Labeling/LabelEvent.kt

@@ -24,6 +24,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.quartz.nip01Core.core.Event
 import com.vitorpamplona.quartz.nip01Core.core.HexKey
 import com.vitorpamplona.quartz.nip01Core.hints.AddressHintProvider
+import com.vitorpamplona.quartz.nip01Core.hints.EventHintBundle
 import com.vitorpamplona.quartz.nip01Core.hints.EventHintProvider
 import com.vitorpamplona.quartz.nip01Core.hints.PubKeyHintProvider
 import com.vitorpamplona.quartz.nip01Core.hints.types.AddressHint
@@ -34,6 +35,7 @@ import com.vitorpamplona.quartz.nip01Core.signers.eventTemplate
 import com.vitorpamplona.quartz.nip01Core.tags.aTag.ATag
 import com.vitorpamplona.quartz.nip01Core.tags.events.ETag
 import com.vitorpamplona.quartz.nip01Core.tags.events.eTag
+import com.vitorpamplona.quartz.nip01Core.tags.events.toETag
 import com.vitorpamplona.quartz.nip01Core.tags.hashtags.HashtagTag
 import com.vitorpamplona.quartz.nip01Core.tags.people.PTag
 import com.vitorpamplona.quartz.nip01Core.tags.people.pTag
@@ -127,18 +129,16 @@ class LabelEvent(
          * follow-graph hashtag feeds match regardless of input case.
          */
         fun buildHashtagLabel(
-            labeledEventId: HexKey,
-            labeledEventRelay: String? = null,
-            labeledEventAuthor: HexKey? = null,
+            labeledEvent: EventHintBundle<out Event>,
             hashtag: String,
             createdAt: Long = TimeUtils.now(),
-        ) = buildEventLabel(
-            labeledEventId = labeledEventId,
-            labeledEventRelay = labeledEventRelay,
-            labeledEventAuthor = labeledEventAuthor,
-            labels = listOf(LabelTag(hashtag.removePrefix("#").lowercase(), HASHTAG_NAMESPACE)),
-            createdAt = createdAt,
-        )
+        ) = eventTemplate<LabelEvent>(KIND, "", createdAt) {
+            alt(ALT)
+            eTag(labeledEvent.toETag())
+            val tag = LabelTag(hashtag.removePrefix("#").lowercase(), HASHTAG_NAMESPACE)
+            labelNamespace(tag.namespace)
+            label(tag)
+        }
 
         /**
          * Build a label event for labeling events.

quartz/src/commonTest/kotlin/com/vitorpamplona/quartz/nip32Labeling/LabelEventTest.kt

@@ -22,6 +22,7 @@ package com.vitorpamplona.quartz.nip32Labeling
 
 import com.vitorpamplona.quartz.nip01Core.core.Event
 import com.vitorpamplona.quartz.nip01Core.crypto.KeyPair
+import com.vitorpamplona.quartz.nip01Core.hints.EventHintBundle
 import com.vitorpamplona.quartz.nip01Core.signers.NostrSignerInternal
 import com.vitorpamplona.quartz.nip32Labeling.tags.LabelTag
 import com.vitorpamplona.quartz.utils.EventFactory
@@ -162,10 +163,20 @@ class LabelEventTest {
 
     @Test
     fun testBuildHashtagLabel() {
+        val labeledEvent =
+            EventFactory.create<Event>(
+                id = testEventId,
+                pubKey = testPubKey,
+                createdAt = 1234567890L,
+                kind = 1,
+                tags = arrayOf(),
+                content = "hello",
+                sig = "c".repeat(128),
+            )
+
         val template =
             LabelEvent.buildHashtagLabel(
-                labeledEventId = testEventId,
-                labeledEventAuthor = testPubKey,
+                labeledEvent = EventHintBundle(labeledEvent),
                 hashtag = "#PhotoGraphy",
             )