diff --git a/commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/actions/ReplyActions.kt b/commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/actions/ReplyActions.kt
new file mode 100644
index 0000000000..28984d4581
--- /dev/null
+++ b/commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/actions/ReplyActions.kt
@@ -0,0 +1,82 @@
+/*
+ * 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.amethyst.commons.actions
+
+import com.vitorpamplona.quartz.nip01Core.hints.EventHintBundle
+import com.vitorpamplona.quartz.nip01Core.signers.NostrSigner
+import com.vitorpamplona.quartz.nip01Core.tags.people.PTag
+import com.vitorpamplona.quartz.nip10Notes.TextNoteEvent
+import com.vitorpamplona.quartz.nip10Notes.tags.notify
+
+/**
+ * Pure event-building "verbs" for kind:1 short-note replies (NIP-10).
+ *
+ * Builds a signed [TextNoteEvent] reply but does NOT publish it. The Amethyst
+ * Android UI flow does more than these builders — non-UI callers are
+ * responsible for the rest:
+ *
+ *  * **Publish.** Hand the returned event to your relay client. Android uses
+ *    `Account.sendMyPublicAndPrivateOutbox`, the desktop deck pipes through
+ *    `dispatch(signed, localCache, relayManager)`, amy uses `Context.publish`.
+ *  * **Writeable check.** Skip the call when the active signer is read-only
+ *    (e.g. an npub-only login). Building will fail at the sign step otherwise.
+ *  * **Parent kind.** Only kind:1 [TextNoteEvent] parents are well-defined here
+ *    — replies to articles / comments belong on the NIP-22 path
+ *    (`CommentEvent.replyBuilder`). Callers must filter; this signature enforces
+ *    it via [EventHintBundle] of `TextNoteEvent`.
+ *  * **Local cache update.** If your caller has a local event cache, feed the
+ *    new event back in so the UI / next read sees the update without a relay
+ *    round-trip.
+ *
+ * Canonical entry point for non-UI callers — the underlying
+ * [TextNoteEvent.build] reply-aware overload handles full NIP-10 tag carry:
+ * `marker=root` (parent's root e-tag if present, else parent.id),
+ * `marker=reply` (parent.id), the parent's full p-tag chain plus parent.pubKey,
+ * and the relay hint from [EventHintBundle].
+ */
+object ReplyActions {
+    /**
+     * Build a kind:1 [TextNoteEvent] that replies to [parent], wrapping it with
+     * NIP-10-correct marked e-tags and the parent's p-tag chain.
+     *
+     * Returns the signed event ready to be published. The reply preserves the
+     * parent's root reference so conformant clients can reconstruct the thread.
+     */
+    suspend fun replyTo(
+        parent: EventHintBundle<TextNoteEvent>,
+        content: String,
+        signer: NostrSigner,
+    ): TextNoteEvent {
+        // Per NIP-10, replies MUST carry the p-tags of the event being replied
+        // to plus the author's pubkey. TextNoteEvent.build(replyingTo=) only
+        // emits the e-tag chain — p-tag carry is the caller's responsibility.
+        val carriedPubKeys =
+            (parent.event.linkedPubKeys() + parent.event.pubKey)
+                .distinct()
+                .map { PTag(it, relayHint = null) }
+
+        val template =
+            TextNoteEvent.build(content, replyingTo = parent) {
+                notify(carriedPubKeys)
+            }
+        return signer.sign(template)
+    }
+}
diff --git a/commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/actions/ReplyActionsTest.kt b/commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/actions/ReplyActionsTest.kt
new file mode 100644
index 0000000000..e602464be5
--- /dev/null
+++ b/commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/actions/ReplyActionsTest.kt
@@ -0,0 +1,105 @@
+/*
+ * 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.amethyst.commons.actions
+
+import com.vitorpamplona.quartz.nip01Core.core.hexToByteArray
+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.nip01Core.tags.people.PTag
+import com.vitorpamplona.quartz.nip10Notes.TextNoteEvent
+import kotlinx.coroutines.test.runTest
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertNotNull
+import kotlin.test.assertTrue
+
+class ReplyActionsTest {
+    private val alicePriv = "0000000000000000000000000000000000000000000000000000000000000007"
+    private val aliceSigner = NostrSignerInternal(KeyPair(alicePriv.hexToByteArray()))
+
+    private val bobPriv = "0000000000000000000000000000000000000000000000000000000000000008"
+    private val bobSigner = NostrSignerInternal(KeyPair(bobPriv.hexToByteArray()))
+
+    @Test
+    fun replyToTopLevelParent_setsRootToParentAndCarriesAuthor() =
+        runTest {
+            // Alice posts a top-level note (no e-tags = parent IS its own root).
+            val parent = aliceSigner.sign(TextNoteEvent.build("hello"))
+            assertTrue(parent.isNewThread(), "parent must be a fresh thread for this case")
+
+            // Bob replies.
+            val reply = ReplyActions.replyTo(EventHintBundle(parent, null), "hi alice", bobSigner)
+
+            assertEquals(TextNoteEvent.KIND, reply.kind)
+            assertEquals(bobSigner.pubKey, reply.pubKey)
+
+            // Per `prepareETagsAsReplyTo`: when parent has no root, only a ROOT
+            // marker is emitted (it doubles as the reply target). No separate
+            // REPLY marker. `markedReplyTos()` should still resolve to parent.id.
+            val root = reply.markedRoot()
+            assertNotNull(root, "reply must carry a NIP-10 root marker")
+            assertEquals(parent.id, root.eventId, "root marker must point at the top-level parent")
+
+            // p-tag carry must include the parent's author so they're notified.
+            val pubKeys = reply.tags.mapNotNull(PTag::parseKey)
+            assertTrue(parent.pubKey in pubKeys, "reply must carry the parent's pubkey in p-tags")
+        }
+
+    @Test
+    fun replyToDeepThread_carriesRootForwardAndChainsPTags() =
+        runTest {
+            // Build A (root) → B (alice's reply to A) → C (carol's reply to B).
+            val a = aliceSigner.sign(TextNoteEvent.build("the original"))
+
+            val carolPriv = "0000000000000000000000000000000000000000000000000000000000000009"
+            val carolSigner = NostrSignerInternal(KeyPair(carolPriv.hexToByteArray()))
+
+            val b = ReplyActions.replyTo(EventHintBundle(a, null), "good point", aliceSigner)
+
+            // C replies to B — must carry A as root (not B), and reply to B.
+            val c = ReplyActions.replyTo(EventHintBundle(b, null), "agreed", carolSigner)
+
+            val rootC = c.markedRoot()
+            assertNotNull(rootC, "deep reply must carry root marker")
+            assertEquals(a.id, rootC.eventId, "deep reply's root must chain through to original")
+
+            val replyC = c.markedReply()
+            assertNotNull(replyC, "deep reply must carry reply marker")
+            assertEquals(b.id, replyC.eventId, "deep reply's reply marker must point at immediate parent")
+
+            // p-tag chain: must include both alice (root author / parent author) and parent.pubKey.
+            val pubKeys = c.tags.mapNotNull(PTag::parseKey).toSet()
+            assertTrue(aliceSigner.pubKey in pubKeys, "deep reply must carry root author in p-tags")
+        }
+
+    @Test
+    fun replyEvent_isSignedAndKind1() =
+        runTest {
+            val parent = aliceSigner.sign(TextNoteEvent.build("seed"))
+            val reply = ReplyActions.replyTo(EventHintBundle(parent, null), "thanks", bobSigner)
+
+            assertEquals(TextNoteEvent.KIND, reply.kind)
+            assertTrue(reply.id.length == 64, "reply id must be a 32-byte hex")
+            assertTrue(reply.sig.length == 128, "reply must be signed (64-byte sig hex)")
+            assertEquals("thanks", reply.content)
+        }
+}
diff --git a/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/cache/EventDispatch.kt b/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/cache/EventDispatch.kt
new file mode 100644
index 0000000000..06a9c51f15
--- /dev/null
+++ b/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/cache/EventDispatch.kt
@@ -0,0 +1,43 @@
+/*
+ * 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.amethyst.desktop.cache
+
+import com.vitorpamplona.amethyst.desktop.network.RelayConnectionManager
+import com.vitorpamplona.quartz.nip01Core.core.Event
+
+/**
+ * Canonical local-first dispatch for user-action events on desktop: write to
+ * the local cache before broadcasting so the UI reflects the action immediately,
+ * even if relay round-trips fail.
+ *
+ * Replaces five inlined `consume + broadcastToAll` couplets that had drifted
+ * in ordering (reactions/follows did broadcast-then-consume, replies did
+ * consume-then-broadcast). Use this everywhere a signed event must be both
+ * persisted locally and pushed to outbox relays.
+ */
+fun dispatch(
+    signed: Event,
+    localCache: DesktopLocalCache,
+    relayManager: RelayConnectionManager,
+) {
+    localCache.consume(signed, relay = null)
+    relayManager.broadcastToAll(signed)
+}
diff --git a/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/FeedScreen.kt b/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/FeedScreen.kt
index ee927efd01..ff25760a79 100644
--- a/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/FeedScreen.kt
+++ b/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/FeedScreen.kt
@@ -82,6 +82,7 @@ import androidx.compose.ui.platform.LocalFocusManager
 import androidx.compose.ui.text.TextRange
 import androidx.compose.ui.text.input.TextFieldValue
 import androidx.compose.ui.unit.dp
+import com.vitorpamplona.amethyst.commons.actions.ReplyActions
 import com.vitorpamplona.amethyst.commons.icons.symbols.Icon
 import com.vitorpamplona.amethyst.commons.icons.symbols.MaterialSymbols
 import com.vitorpamplona.amethyst.commons.model.Note
@@ -103,6 +104,7 @@ import com.vitorpamplona.amethyst.desktop.DesktopPreferences
 import com.vitorpamplona.amethyst.desktop.SearchHistoryStore
 import com.vitorpamplona.amethyst.desktop.account.AccountState
 import com.vitorpamplona.amethyst.desktop.cache.DesktopLocalCache
+import com.vitorpamplona.amethyst.desktop.cache.dispatch
 import com.vitorpamplona.amethyst.desktop.feeds.DesktopCustomFeedFilter
 import com.vitorpamplona.amethyst.desktop.feeds.DesktopFollowingFeedFilter
 import com.vitorpamplona.amethyst.desktop.feeds.DesktopGlobalFeedFilter
@@ -135,11 +137,7 @@ import com.vitorpamplona.quartz.nip01Core.core.Event
 import com.vitorpamplona.quartz.nip01Core.hints.EventHintBundle
 import com.vitorpamplona.quartz.nip01Core.metadata.MetadataEvent
 import com.vitorpamplona.quartz.nip01Core.relay.filters.Filter
-import com.vitorpamplona.quartz.nip01Core.tags.events.ETag
-import com.vitorpamplona.quartz.nip01Core.tags.events.eTag
 import com.vitorpamplona.quartz.nip01Core.tags.hashtags.HashtagTag
-import com.vitorpamplona.quartz.nip01Core.tags.people.PTag
-import com.vitorpamplona.quartz.nip01Core.tags.people.pTag
 import com.vitorpamplona.quartz.nip10Notes.TextNoteEvent
 import com.vitorpamplona.quartz.nip18Reposts.GenericRepostEvent
 import com.vitorpamplona.quartz.nip18Reposts.RepostEvent
@@ -421,9 +419,8 @@ fun FeedScreen(
                 followMutex.withLock {
                     val currentList = localCache.lastContactListEvent
                     val updatedEvent = FollowAction.follow(pubKeyHex, account.signer, currentList)
-                    relayManager.broadcastToAll(updatedEvent)
-                    // consume updates followedUsers StateFlow + stores the event
-                    localCache.consume(updatedEvent, relay = null)
+                    // consume updates followedUsers StateFlow + stores the event before broadcast
+                    dispatch(updatedEvent, localCache, relayManager)
                 }
             }
         }
@@ -1550,19 +1547,14 @@ private fun ExpandedNoteContent(
                         myAvatarUrl = myAvatarUrl,
                         onSend = { content ->
                             withContext(Dispatchers.IO) {
-                                val template =
-                                    TextNoteEvent.build(content) {
-                                        val etag = ETag(event.id)
-                                        etag.relay = null
-                                        etag.author = event.pubKey
-                                        eTag(etag)
-                                        pTag(
-                                            PTag(event.pubKey, relayHint = null),
-                                        )
-                                    }
-                                val signedEvent = account.signer.sign(template)
-                                localCache.consume(signedEvent, relay = null)
-                                relayManager.broadcastToAll(signedEvent)
+                                val parentText = event as? TextNoteEvent ?: return@withContext
+                                val signedEvent =
+                                    ReplyActions.replyTo(
+                                        EventHintBundle(parentText, null),
+                                        content,
+                                        account.signer,
+                                    )
+                                dispatch(signedEvent, localCache, relayManager)
                             }
                         },
                     )
@@ -1613,8 +1605,7 @@ private fun ExpandedNoteContent(
                                             "+",
                                             account.signer,
                                         )
-                                    relayManager.broadcastToAll(signed)
-                                    localCache.consume(signed, relay = null)
+                                    dispatch(signed, localCache, relayManager)
                                 }
                             }
                         },
diff --git a/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/NoteActions.kt b/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/NoteActions.kt
index b69da8aae7..83806d8395 100644
--- a/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/NoteActions.kt
+++ b/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/NoteActions.kt
@@ -86,6 +86,7 @@ import com.vitorpamplona.amethyst.commons.model.nip51Bookmarks.BookmarkAction
 import com.vitorpamplona.amethyst.commons.model.nip57Zaps.ZapAction
 import com.vitorpamplona.amethyst.commons.service.lnurl.LightningAddressResolver
 import com.vitorpamplona.amethyst.commons.ui.components.UserAvatar
+import com.vitorpamplona.amethyst.commons.util.toZapAmount
 import com.vitorpamplona.amethyst.desktop.account.AccountState
 import com.vitorpamplona.amethyst.desktop.cache.DesktopLocalCache
 import com.vitorpamplona.amethyst.desktop.network.DesktopHttpClient
@@ -232,7 +233,7 @@ fun ZapAmountDialog(
                         FilterChip(
                             selected = selectedAmount == amount,
                             onClick = { selectedAmount = amount },
-                            label = { Text(formatSats(amount)) },
+                            label = { Text(amount.toZapAmount()) },
                         )
                     }
                 }
@@ -250,7 +251,7 @@ fun ZapAmountDialog(
         },
         confirmButton = {
             Button(onClick = { onZap(selectedAmount, message) }) {
-                Text("Zap ${formatSats(selectedAmount)} sats")
+                Text("Zap ${selectedAmount.toZapAmount()} sats")
             }
         },
         dismissButton = {
@@ -261,8 +262,6 @@ fun ZapAmountDialog(
     )
 }
 
-private fun formatSats(amount: Long): String = if (amount >= 1000) "${amount / 1000}k" else "$amount"
-
 /**
  * Dialog for choosing bookmark visibility (public or private).
  */
@@ -369,7 +368,7 @@ fun ZapReceiptsDialog(
                     tint = MaterialTheme.colorScheme.primary,
                     modifier = Modifier.size(24.dp),
                 )
-                Text("${formatSats(totalAmount)} sats")
+                Text("${totalAmount.toZapAmount()} sats")
                 if (isLoading) {
                     CircularProgressIndicator(
                         modifier = Modifier.size(16.dp),
@@ -411,7 +410,7 @@ fun ZapReceiptsDialog(
                                 }
                             }
                             Text(
-                                text = "${formatSats(receipt.amountSats)} sats",
+                                text = "${receipt.amountSats.toZapAmount()} sats",
                                 style = MaterialTheme.typography.labelMedium,
                                 color = MaterialTheme.colorScheme.primary,
                             )
@@ -526,7 +525,7 @@ fun ZapReceiptsPopup(
                             modifier = Modifier.size(16.dp),
                         )
                         Text(
-                            "${formatSats(totalSats)} sats",
+                            "${totalSats.toZapAmount()} sats",
                             style = MaterialTheme.typography.titleSmall,
                             fontWeight = FontWeight.Bold,
                             color = MaterialTheme.colorScheme.primary,
@@ -567,7 +566,7 @@ fun ZapReceiptsPopup(
                                 }
                             }
                             Text(
-                                text = "${formatSats(entry.amount)} sats",
+                                text = "${entry.amount.toZapAmount()} sats",
                                 style = MaterialTheme.typography.labelMedium,
                                 color = MaterialTheme.colorScheme.primary,
                             )
@@ -1229,7 +1228,7 @@ fun NoteActionsRow(
             }
             if (zapAmountSats > 0) {
                 Text(
-                    text = formatSats(zapAmountSats),
+                    text = zapAmountSats.toZapAmount(),
                     style = MaterialTheme.typography.labelSmall,
                     color = MaterialTheme.colorScheme.primary,
                     modifier = Modifier.clickable { showZapReceiptsDialog = true },
diff --git a/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/ThreadScreen.kt b/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/ThreadScreen.kt
index 9c6894d4e9..78f8b224d4 100644
--- a/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/ThreadScreen.kt
+++ b/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/ThreadScreen.kt
@@ -49,6 +49,7 @@ import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
+import com.vitorpamplona.amethyst.commons.actions.ReplyActions
 import com.vitorpamplona.amethyst.commons.icons.symbols.Icon
 import com.vitorpamplona.amethyst.commons.icons.symbols.MaterialSymbols
 import com.vitorpamplona.amethyst.commons.model.Note
@@ -60,6 +61,7 @@ import com.vitorpamplona.amethyst.commons.ui.feeds.FeedState
 import com.vitorpamplona.amethyst.commons.util.toTimeAgo
 import com.vitorpamplona.amethyst.desktop.account.AccountState
 import com.vitorpamplona.amethyst.desktop.cache.DesktopLocalCache
+import com.vitorpamplona.amethyst.desktop.cache.dispatch
 import com.vitorpamplona.amethyst.desktop.feeds.DesktopThreadFilter
 import com.vitorpamplona.amethyst.desktop.network.DesktopRelayConnectionManager
 import com.vitorpamplona.amethyst.desktop.subscriptions.DesktopRelaySubscriptionsCoordinator
@@ -77,11 +79,7 @@ import com.vitorpamplona.amethyst.desktop.ui.thread.RelatedContentSection
 import com.vitorpamplona.amethyst.desktop.viewmodels.DesktopFeedViewModel
 import com.vitorpamplona.quartz.nip01Core.core.Event
 import com.vitorpamplona.quartz.nip01Core.hints.EventHintBundle
-import com.vitorpamplona.quartz.nip01Core.tags.events.ETag
-import com.vitorpamplona.quartz.nip01Core.tags.events.eTag
 import com.vitorpamplona.quartz.nip01Core.tags.hashtags.hashtags
-import com.vitorpamplona.quartz.nip01Core.tags.people.PTag
-import com.vitorpamplona.quartz.nip01Core.tags.people.pTag
 import com.vitorpamplona.quartz.nip10Notes.TextNoteEvent
 import com.vitorpamplona.quartz.nip19Bech32.Nip19Parser
 import com.vitorpamplona.quartz.nip19Bech32.entities.NEvent
@@ -342,24 +340,16 @@ fun ThreadScreen(
                                             myAvatarUrl = myAvatarUrl,
                                             onSend = { content ->
                                                 withContext(Dispatchers.IO) {
-                                                    val rootEvent =
-                                                        rootNote.event ?: return@withContext
-                                                    val template =
-                                                        TextNoteEvent.build(content) {
-                                                            val etag = ETag(rootEvent.id)
-                                                            etag.relay = null
-                                                            etag.author = rootEvent.pubKey
-                                                            eTag(etag)
-                                                            pTag(
-                                                                PTag(
-                                                                    rootEvent.pubKey,
-                                                                    relayHint = null,
-                                                                ),
-                                                            )
-                                                        }
-                                                    val signedEvent = account.signer.sign(template)
-                                                    localCache.consume(signedEvent, relay = null)
-                                                    relayManager.broadcastToAll(signedEvent)
+                                                    val parentText =
+                                                        rootNote.event as? TextNoteEvent
+                                                            ?: return@withContext
+                                                    val signedEvent =
+                                                        ReplyActions.replyTo(
+                                                            EventHintBundle(parentText, null),
+                                                            content,
+                                                            account.signer,
+                                                        )
+                                                    dispatch(signedEvent, localCache, relayManager)
                                                 }
                                             },
                                         )
@@ -420,8 +410,7 @@ fun ThreadScreen(
                                                                 "+",
                                                                 account.signer,
                                                             )
-                                                        relayManager.broadcastToAll(signed)
-                                                        localCache.consume(signed, relay = null)
+                                                        dispatch(signed, localCache, relayManager)
                                                     }
                                                 }
                                             },
diff --git a/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/DeckColumnContainer.kt b/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/DeckColumnContainer.kt
index 4a203c74b7..90f0dbce05 100644
--- a/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/DeckColumnContainer.kt
+++ b/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/DeckColumnContainer.kt
@@ -146,8 +146,12 @@ fun DeckColumnContainer(
     val currentOverlay = navState.current
     val focusRequester = remember { FocusRequester() }
 
-    // Request focus on nav change so Esc key works
-    LaunchedEffect(currentOverlay) {
+    // Request focus once when the column is created. Re-keying on
+    // `currentOverlay` would steal focus from sibling columns whenever any
+    // deck column mutates its overlay state (e.g. typing in column A's reply
+    // box loses focus when column B opens a profile). Esc continues to work
+    // because the column still owns focus when the user hits the key.
+    LaunchedEffect(Unit) {
         focusRequester.requestFocus()
     }
 
diff --git a/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/DeckLayout.kt b/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/DeckLayout.kt
index 96058bcf88..aba4cbd9c5 100644
--- a/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/DeckLayout.kt
+++ b/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/DeckLayout.kt
@@ -35,6 +35,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.key
 import androidx.compose.runtime.snapshotFlow
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.input.pointer.PointerIcon
@@ -119,27 +120,31 @@ fun DeckLayout(
                     )
                 }
 
-                DeckColumnContainer(
-                    column = column,
-                    canClose = columns.size > 1,
-                    onClose = { deckState.removeColumn(column.id) },
-                    onDoubleClickHeader = { deckState.expandColumn(column.id, availableWidthDp) },
-                    relayManager = relayManager,
-                    localCache = localCache,
-                    accountManager = accountManager,
-                    account = account,
-                    iAccount = iAccount,
-                    nwcConnection = nwcConnection,
-                    subscriptionsCoordinator = subscriptionsCoordinator,
-                    highlightStore = highlightStore,
-                    draftStore = draftStore,
-                    nip11Fetcher = nip11Fetcher,
-                    appScope = appScope,
-                    onShowComposeDialog = onShowComposeDialog,
-                    onShowReplyDialog = onShowReplyDialog,
-                    onZapFeedback = onZapFeedback,
-                    onNavigateToRelays = onNavigateToRelays,
-                )
+                // Key by column id so reorder/remove doesn't re-run the
+                // child's `LaunchedEffect(Unit)` (which grabs keyboard focus).
+                key(column.id) {
+                    DeckColumnContainer(
+                        column = column,
+                        canClose = columns.size > 1,
+                        onClose = { deckState.removeColumn(column.id) },
+                        onDoubleClickHeader = { deckState.expandColumn(column.id, availableWidthDp) },
+                        relayManager = relayManager,
+                        localCache = localCache,
+                        accountManager = accountManager,
+                        account = account,
+                        iAccount = iAccount,
+                        nwcConnection = nwcConnection,
+                        subscriptionsCoordinator = subscriptionsCoordinator,
+                        highlightStore = highlightStore,
+                        draftStore = draftStore,
+                        nip11Fetcher = nip11Fetcher,
+                        appScope = appScope,
+                        onShowComposeDialog = onShowComposeDialog,
+                        onShowReplyDialog = onShowReplyDialog,
+                        onZapFeedback = onZapFeedback,
+                        onNavigateToRelays = onNavigateToRelays,
+                    )
+                }
             }
         }
     }
diff --git a/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/thread/CommentItem.kt b/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/thread/CommentItem.kt
index 16d8b6de08..7097592a4a 100644
--- a/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/thread/CommentItem.kt
+++ b/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/thread/CommentItem.kt
@@ -37,6 +37,7 @@ import androidx.compose.ui.unit.dp
 import com.vitorpamplona.amethyst.commons.icons.symbols.Icon
 import com.vitorpamplona.amethyst.commons.icons.symbols.MaterialSymbols
 import com.vitorpamplona.amethyst.commons.ui.components.UserAvatar
+import com.vitorpamplona.amethyst.commons.util.toZapAmount
 
 @Composable
 fun CommentItem(
@@ -152,7 +153,7 @@ fun CommentItem(
                     if (zapAmount > 0) {
                         Spacer(Modifier.width(4.dp))
                         Text(
-                            text = formatZapAmount(zapAmount),
+                            text = zapAmount.toZapAmount(),
                             style = MaterialTheme.typography.labelSmall,
                             color = zapColor,
                         )
@@ -162,10 +163,3 @@ fun CommentItem(
         }
     }
 }
-
-private fun formatZapAmount(sats: Long): String =
-    when {
-        sats >= 1_000_000 -> "${sats / 1_000_000}M"
-        sats >= 1_000 -> "${sats / 1_000}k"
-        else -> sats.toString()
-    }
diff --git a/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/thread/RelatedContentRow.kt b/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/thread/RelatedContentRow.kt
index fdf6959cb2..a9252ccd93 100644
--- a/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/thread/RelatedContentRow.kt
+++ b/desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/thread/RelatedContentRow.kt
@@ -40,11 +40,8 @@ import androidx.compose.material3.CardDefaults
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
+import androidx.compose.runtime.produceState
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
@@ -59,9 +56,11 @@ import com.vitorpamplona.amethyst.commons.feeds.related.CompactNoteData
 import com.vitorpamplona.amethyst.commons.model.Note
 import com.vitorpamplona.amethyst.commons.richtext.RichTextParser
 import com.vitorpamplona.amethyst.commons.richtext.UrlParser
+import com.vitorpamplona.amethyst.commons.util.showAmount
 import com.vitorpamplona.amethyst.desktop.cache.DesktopLocalCache
 import com.vitorpamplona.quartz.nip01Core.tags.hashtags.isTaggedHashes
 import com.vitorpamplona.quartz.nip10Notes.TextNoteEvent
+import java.math.BigDecimal
 
 /**
  * Horizontal scrollable row of compact related content cards.
@@ -78,67 +77,37 @@ fun RelatedContentSection(
     onViewAll: () -> Unit = {},
     modifier: Modifier = Modifier,
 ) {
-    var relatedItems by remember(noteId) { mutableStateOf<List<CompactNoteData>>(emptyList()) }
+    val lowercaseTags = noteHashtags.map { it.lowercase() }.toSet()
 
-    DisposableEffect(noteId) {
-        val results = mutableListOf<Note>()
-        val lowercaseTags = noteHashtags.map { it.lowercase() }.toSet()
-        val limit = 6
-
-        // Scan cache for related content
-        if (lowercaseTags.isNotEmpty()) {
-            localCache.notes.forEach { key, note ->
-                if (note.idHex != noteId &&
-                    note.event is TextNoteEvent &&
-                    note.event?.tags?.isTaggedHashes(lowercaseTags) == true
-                ) {
-                    results.add(note)
-                }
+    // Re-scan the cache initially and whenever a bundle of new events arrives
+    // that contains a candidate (same hashtag or same author). Without this,
+    // expanding a note on a cold cache leaves the section empty until the user
+    // collapses + re-expands.
+    val relatedItems by produceState<List<CompactNoteData>>(
+        initialValue = emptyList(),
+        key1 = noteId,
+        key2 = authorPubKey,
+        key3 = lowercaseTags,
+    ) {
+        fun rescan() {
+            runCatching {
+                value = scanRelated(localCache, noteId, authorPubKey, lowercaseTags)
             }
         }
-
-        // Fallback: same author
-        if (results.size < limit) {
-            localCache.notes.forEach { key, note ->
-                if (note.idHex != noteId &&
-                    note.event is TextNoteEvent &&
-                    note.event?.pubKey == authorPubKey &&
-                    note !in results
-                ) {
-                    results.add(note)
+        rescan()
+        localCache.eventStream.newEventBundles.collect { bundle ->
+            val matters =
+                bundle.any { n ->
+                    val ev = n.event
+                    ev is TextNoteEvent &&
+                        n.idHex != noteId &&
+                        (
+                            ev.pubKey == authorPubKey ||
+                                (lowercaseTags.isNotEmpty() && ev.tags.isTaggedHashes(lowercaseTags))
+                        )
                 }
-            }
+            if (matters) rescan()
         }
-
-        relatedItems =
-            results
-                .sortedByDescending { it.createdAt() }
-                .take(limit)
-                .map { note ->
-                    val event = note.event
-                    val content = event?.content ?: ""
-                    val firstLine =
-                        content
-                            .take(80)
-                            .lineSequence()
-                            .firstOrNull()
-                            ?.take(60) ?: ""
-                    val author = localCache.getUserIfExists(event?.pubKey ?: "")
-                    val imageUrl =
-                        UrlParser()
-                            .parseValidUrls(content)
-                            .withScheme
-                            .firstOrNull { RichTextParser.isImageUrl(it) }
-                    CompactNoteData(
-                        id = note.idHex,
-                        title = firstLine.ifBlank { "Note" },
-                        authorName = author?.toBestDisplayName() ?: event?.pubKey?.take(8) ?: "",
-                        thumbnailUrl = imageUrl,
-                        zapCount = if (note.zapsAmount > java.math.BigDecimal.ZERO) "${note.zapsAmount.toLong()}" else "",
-                    )
-                }
-
-        onDispose { }
     }
 
     if (relatedItems.isNotEmpty()) {
@@ -192,6 +161,76 @@ fun RelatedContentSection(
     }
 }
 
+private const val RELATED_LIMIT = 6
+
+/**
+ * Scan the local cache for notes related to [noteId] either by sharing a
+ * hashtag in [lowercaseTags] or by being authored by [authorPubKey]. Returns
+ * up to [RELATED_LIMIT] notes, most recent first, mapped to [CompactNoteData].
+ *
+ * Runs O(N) over `localCache.notes` — backed by `ConcurrentSkipListMap` which
+ * supports concurrent inserts during iteration (weakly consistent). Safe on
+ * the main composition coroutine for typical cache sizes (~30k notes).
+ */
+private fun scanRelated(
+    localCache: DesktopLocalCache,
+    noteId: String,
+    authorPubKey: String,
+    lowercaseTags: Set<String>,
+): List<CompactNoteData> {
+    val results = mutableListOf<Note>()
+
+    if (lowercaseTags.isNotEmpty()) {
+        localCache.notes.forEach { _, note ->
+            if (note.idHex != noteId &&
+                note.event is TextNoteEvent &&
+                note.event?.tags?.isTaggedHashes(lowercaseTags) == true
+            ) {
+                results.add(note)
+            }
+        }
+    }
+
+    if (results.size < RELATED_LIMIT) {
+        localCache.notes.forEach { _, note ->
+            if (note.idHex != noteId &&
+                note.event is TextNoteEvent &&
+                note.event?.pubKey == authorPubKey &&
+                note !in results
+            ) {
+                results.add(note)
+            }
+        }
+    }
+
+    return results
+        .sortedByDescending { it.createdAt() }
+        .take(RELATED_LIMIT)
+        .map { note ->
+            val event = note.event
+            val content = event?.content ?: ""
+            val firstLine =
+                content
+                    .take(80)
+                    .lineSequence()
+                    .firstOrNull()
+                    ?.take(60) ?: ""
+            val author = localCache.getUserIfExists(event?.pubKey ?: "")
+            val imageUrl =
+                UrlParser()
+                    .parseValidUrls(content)
+                    .withScheme
+                    .firstOrNull { RichTextParser.isImageUrl(it) }
+            CompactNoteData(
+                id = note.idHex,
+                title = firstLine.ifBlank { "Note" },
+                authorName = author?.toBestDisplayName() ?: event?.pubKey?.take(8) ?: "",
+                thumbnailUrl = imageUrl,
+                zapCount = if (note.zapsAmount > BigDecimal.ZERO) showAmount(note.zapsAmount) else "",
+            )
+        }
+}
+
 @Composable
 private fun CompactRelatedCard(
     item: CompactNoteData,
diff --git a/docs/plans/2026-06-02-fix-desktop-feed-review-findings-plan.md b/docs/plans/2026-06-02-fix-desktop-feed-review-findings-plan.md
new file mode 100644
index 0000000000..4beeba620f
--- /dev/null
+++ b/docs/plans/2026-06-02-fix-desktop-feed-review-findings-plan.md
@@ -0,0 +1,588 @@
+---
+title: Fix 5 review findings on PR #3124 desktop feed UI refresh
+type: fix
+status: active
+date: 2026-06-02
+pr: https://github.com/vitorpamplona/amethyst/pull/3124
+review_comment: https://github.com/vitorpamplona/amethyst/pull/3124#issuecomment-4599816576
+worktree: ../AmethystMultiplatform-feed-review
+branch: fix/desktop-feed-ui-review (tracks origin/feat/desktop-feed-ui-refresh)
+deepened: 2026-06-02
+---
+
+# Fix 5 review findings on PR #3124
+
+## Enhancement summary (2026-06-02 deepen-plan)
+
+Eight parallel agents resolved all 5 open questions and surfaced 3 plan revisions:
+
+**Open questions resolved:**
+- **Q1 — kind-1 NIP-10 vs kind-1111 NIP-22:** kind-1 NIP-10 confirmed. Android's
+  `NotificationReplyReceiver` already routes by parent type
+  (`TextNoteEvent` → kind 1, others → kind 1111). Desktop feed loads kind 1
+  only (`DesktopFeedFilters.kt:39`). Use kind 1 + `prepareETagsAsReplyTo`.
+- **Q2 — extract consume+broadcast couplet:** YES. Five clean call sites (no
+  inline complexity) + ordering inconsistency (`TextNoteEvent` does
+  consume→broadcast at `ThreadScreen.kt:361` and `FeedScreen.kt:1564`,
+  Reaction/Follow do broadcast→consume at `ThreadScreen.kt:424`,
+  `FeedScreen.kt:426`/`:1617`). A `desktopApp` extension fixes both volume and
+  the ordering drift. Canonical order: consume→broadcast (local-first).
+- **Q3 — Phase 4 produceState vs ViewModel:** produceState. `LargeCache.notes`
+  is a `ConcurrentSkipListMap` (`LargeCache.jvmAndroid.kt:27`) — weakly
+  consistent iterator, safe on main composition coroutine, 50–150ms for ~30k
+  notes. No debounce needed; candidate-filter pre-check blocks 80–90% of
+  bundles. `FeedViewModel.kt:54-59` precedent collects same stream without
+  debounce.
+- **Q4 — NoteActions.kt:264 formatSats:** sats, safe to swap to
+  `amount.toZapAmount()`. Inputs are hardcoded preset amounts (line 111
+  `ZAP_AMOUNTS = listOf(21L, 100L, ...)`) and `LnZapEvent.amount` which is
+  already sats (`LnZapEvent.kt:69`).
+- **Q5 — WalletColumnScreen.kt:979 formatSats:** intentional. Wallet shows
+  precise balance with locale-aware grouping (`1,000,000`). Leave + add
+  `// intentional` comment to prevent future drift.
+
+**Plan revisions:**
+- **Phase 1 path flattening:** move `ReplyActions` from
+  `commons/.../actions/nip10Notes/ReplyActions.kt` to flat
+  `commons/.../actions/ReplyActions.kt`. Sister actions (`FollowActions`,
+  `ZapActions`, `DmActions`, `SearchActions`) are all flat under `actions/`;
+  no `nipNN/` subpackage convention. (Architecture review)
+- **Phase 5 simplification:** drop the explicit `requestFocus()` in the Esc
+  handler; the column never loses focus during pop (Esc was *received by* the
+  focused column). Just `LaunchedEffect(Unit) { requestFocus() }` + the
+  existing `.focusable()`. Add `key(column.id) { DeckColumnContainer(...) }`
+  wrap in `DeckLayout.kt:111` so `LaunchedEffect(Unit)` survives column
+  reordering. (Code-simplicity + focus-audit review)
+- **Phase 2 promoted from "optional":** with 5 verified duplicates + order
+  inconsistency, extract `Account.dispatch(signed: Event)` as a
+  `desktopApp` extension. Canonical order: consume→broadcast. Not in
+  `commons` (relay manager + cache are desktop types).
+
+**Android follow-up (out of this PR):** 4 inlined `TextNoteEvent.build` sites
+on Android (`ShortNotePostViewModel.kt:1037`, `VoiceReplyViewModel.kt:265`,
+`NotificationReplyReceiver.kt:203`, `AmethystAppFunctions.kt:1051`) should
+migrate to the new `ReplyActions.replyTo` in a follow-up PR. Tracked in
+"Future work" below.
+
+## Overview
+
+Davotoula's review on PR #3124 (`feat/desktop-feed-ui-refresh`) flagged 5 issues
+ranging from one **NIP-10 protocol bug** (inline reply emits a tag set other
+clients can't thread) down to **consistency bugs** (zap totals bypass the shared
+formatter). All confirmed by inspecting `origin/feat/desktop-feed-ui-refresh`.
+
+This plan groups the fixes so dependent ones land in a sequence that compiles at
+each step, and routes the protocol/architectural fixes through existing shared
+helpers (`TextNoteEvent.build(replyingTo=…)`, `ReactionAction`, `FollowAction`,
+`ZapFormatter.showAmount`) rather than introducing new abstractions.
+
+## Findings (root-cause confirmed)
+
+### #3 — Inline reply emits lower-fidelity NIP-10 tag set [PROTOCOL BUG]
+
+**File:** `desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/FeedScreen.kt:1554`
+
+**Current code:**
+```kotlin
+val template = TextNoteEvent.build(content) {
+    val etag = ETag(event.id)
+    etag.relay = null
+    etag.author = event.pubKey
+    eTag(etag)
+    pTag(PTag(event.pubKey, relayHint = null))
+}
+```
+
+**Root cause:** the call uses the **single-arg** `TextNoteEvent.build(note, initializer)`
+overload at `quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip10Notes/TextNoteEvent.kt:133`
+and hand-rolls a minimal reply tag set. It emits a single unmarked `e`-tag and a
+single `p`-tag. **No NIP-10 root marker. No carry of the parent's root-e-tag.
+No carry of the parent's p-tag chain.** Replying to a note deep in a thread
+produces an event with no `root` reference; conformant clients (Damus, Primal,
+Coracle…) can't reconstruct the thread.
+
+**Fix:** switch to the **reply-aware overload** at `TextNoteEvent.kt:142`:
+
+```kotlin
+fun build(
+    note: String,
+    replyingTo: EventHintBundle<TextNoteEvent>? = null,
+    forkingFrom: EventHintBundle<TextNoteEvent>? = null,
+    …
+) = eventTemplate(KIND, note, createdAt) {
+    alt(shortedMessageForAlt(note))
+    if (replyingTo != null || forkingFrom != null) {
+        markedETags(prepareETagsAsReplyTo(replyingTo, forkingFrom))
+    }
+    initializer()
+}
+```
+
+`prepareETagsAsReplyTo` (already in quartz) handles **root marker, reply marker,
+parent root/p-tag carry** correctly. The inline path was bypassing it.
+
+### #4 — Reaction/follow/reply business logic in desktop composables
+
+**Files:**
+- `FeedScreen.kt:1611` — reaction (likes from inline expansion)
+- `FeedScreen.kt:423` — follow (follow pill from feed)
+- `FeedScreen.kt:1554` — reply (inline reply input)
+
+**Current state (verified):**
+- **Follow** already uses `FollowAction.follow(pubKeyHex, signer, currentList)`
+  (commons). The complaint is the surrounding `cache.consume → broadcast`
+  couplet inlined in the composable.
+- **Reaction** already uses `ReactionAction.reactTo(EventHintBundle, "+", signer)`
+  (commons). Same couplet inlined.
+- **Reply** does NOT use a shared builder (see #3).
+
+**CLAUDE.md rule (`commons/ARCHITECTURE.md:73-88`):** "actions package (CLI-safe):
+Event builders for user actions (follow, zap…). The canonical entry point for
+non-UI callers."
+
+**Fix:** introduce a new shared action that mirrors `FollowActions` for kind-1
+replies. The consume+broadcast couplet stays inline (2 lines, platform-specific
+relay/cache wiring), but the *protocol-touching* build moves out:
+
+```kotlin
+// commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/actions/nip10Notes/ReplyActions.kt
+object ReplyActions {
+    suspend fun replyTo(
+        parent: EventHintBundle<TextNoteEvent>,
+        content: String,
+        signer: NostrSigner,
+    ): TextNoteEvent {
+        val template = TextNoteEvent.build(content, replyingTo = parent)
+        return signer.sign(template)
+    }
+}
+```
+
+Desktop call site becomes:
+```kotlin
+val parentText = event as? TextNoteEvent ?: return@withContext
+val signed = ReplyActions.replyTo(EventHintBundle(parentText, null), content, account.signer)
+localCache.consume(signed, relay = null)
+relayManager.broadcastToAll(signed)
+```
+
+This matches the shape already used for `FollowAction.follow` at `FeedScreen.kt:423`
+and `ReactionAction.reactTo` at `NoteActions.kt:1393`. Drift between desktop and
+Android paths is bounded to a 3-line couplet that won't grow.
+
+### #1 — Related content stale after one scan
+
+**File:** `desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/thread/RelatedContentRow.kt:83`
+
+**Current code:**
+```kotlin
+DisposableEffect(noteId) {
+    val results = mutableListOf<Note>()
+    // scan localCache.notes once
+    localCache.notes.forEach { … }
+    relatedItems = results.sortedByDescending { it.createdAt() }.take(6).map { … }
+    onDispose { }
+}
+```
+
+**Root cause:** `DisposableEffect(noteId)` re-runs only on `noteId` change. The
+scan reads `localCache.notes` (a `LargeCache`) at composition time; nothing
+re-runs the scan as the cache fills. Expanding a note on a cold cache leaves
+the section empty/partial until collapse+re-expand. Also missing keys:
+`noteHashtags` and `authorPubKey` (cosmetic — caller stabilises these per noteId).
+
+**Fix:** observe the cache's change stream and re-scan on bundle arrivals.
+`DesktopLocalCache` exposes `eventStream: DesktopCacheEventStream` with
+`newEventBundles: SharedFlow<Set<Note>>` (`DesktopLocalCache.kt:719-743`).
+
+Two options:
+
+**Option A (simpler, matches inline-section scale):** `produceState` keyed by
+`(noteId, hashtagsHash, authorPubKey)` that collects `newEventBundles` and
+re-runs the scan when relevant events land:
+
+```kotlin
+val relatedItems by produceState<List<CompactNoteData>>(emptyList(), noteId, authorPubKey, noteHashtags) {
+    fun rescan() { value = scanRelated(localCache, noteId, authorPubKey, noteHashtags) }
+    rescan() // initial
+    localCache.eventStream.newEventBundles.collect { bundle ->
+        if (bundle.any { isCandidate(it, noteHashtags, authorPubKey) }) rescan()
+    }
+}
+```
+
+**Option B (matches FeedViewModel family):** new `RelatedContentViewModel` in
+`commons/src/commonMain/.../viewmodels/related/`, taking a `FeedFilter` style
+"by hashtag OR by author" predicate and exposing
+`StateFlow<List<CompactNoteData>>`. Heavier but consistent with the rest of the
+feed system.
+
+**Recommendation:** **Option A** — the related-content row is a 6-item sidecar,
+not a feed. A ViewModel adds wiring without solving an actual problem here.
+Deepen-plan agent may overrule.
+
+### #2 — Deck columns steal focus from each other
+
+**File:** `desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/DeckColumnContainer.kt:150`
+
+**Current code:**
+```kotlin
+val focusRequester = remember { FocusRequester() }
+LaunchedEffect(currentOverlay) { focusRequester.requestFocus() }
+```
+
+**Root cause:** `LaunchedEffect(currentOverlay)` fires on the column's first
+composition **and on every overlay change**. In a multi-column deck, when
+column B opens an overlay, column B's effect grabs focus — yanking it out of
+column A's inline reply input mid-typing.
+
+**Fix:** decouple "request focus once on initial composition" from "Escape
+handler needs focus to be live." The Escape key path works as long as the
+column owns focus when the user presses Escape — which it does after the
+initial composition. Match the existing pattern at
+`EditProfileScreen.kt:380` (`LaunchedEffect(Unit) { focusRequester.requestFocus() }`)
+**and** scope the effect so only the column the user is interacting with
+re-grabs focus when a nested overlay closes (i.e. on `popOverlay()`).
+
+Concretely:
+1. Change `LaunchedEffect(currentOverlay)` → `LaunchedEffect(Unit)` for the
+   initial focus request.
+2. When the user presses Escape and `navState.pop()` succeeds, explicitly call
+   `focusRequester.requestFocus()` in the key handler (intent-driven, not
+   composition-driven).
+
+This contains focus stealing to the column the user actually interacted with.
+
+### #5 — Zap totals bypass shared formatter
+
+**Files:**
+- `RelatedContentRow.kt:137` — `zapCount = "${note.zapsAmount.toLong()}"` (raw, e.g. `"1500000"`)
+- `CommentItem.kt:155` — `text = formatZapAmount(zapAmount)` calling local helper
+- `CommentItem.kt:166-171` — private `formatZapAmount(sats: Long)` hand-rolled k/M
+
+**Shared formatter (`commons/src/jvmAndroid/kotlin/com/vitorpamplona/amethyst/commons/util/ZapFormatter.kt`):**
+- `fun showAmount(amount: BigDecimal?): String` — G/M/k suffixes, `""` for null/<0.01
+- `fun showAmountWithZero(amount: BigDecimal?): String` — same, `"0"` instead of `""`
+- `fun Long.toZapAmount(): String`
+- `fun Int.toZapAmount(): String`
+
+`Note.zapsAmount` is `BigDecimal` (`commons/src/commonMain/.../model/Note.kt:183`),
+so use `showAmount(note.zapsAmount)` directly in `RelatedContentRow`. `CommentItem`
+takes a `Long`, so use `zapAmount.toZapAmount()` and delete the local helper.
+
+**Also flagged (outside review but same root cause):**
+- `NoteActions.kt:264` — local `formatSats(amount: Long)` with only `k` suffix.
+- `WalletColumnScreen.kt:979` — local `formatSats` using `NumberFormat` (intentional?
+  wallet flows may want full sats — leave but document).
+
+Cover the two review-flagged sites + `NoteActions.kt:264`. Defer wallet.
+
+## Phased implementation plan
+
+Phases ordered so each compiles + tests cleanly without depending on later work.
+
+### Phase 1 — Shared `ReplyActions` (fixes #3, completes #4 reply)
+
+**Create:** `commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/actions/ReplyActions.kt` *(flat — matches `FollowActions.kt`, `ZapActions.kt`, `DmActions.kt`; no `nip10Notes/` subpackage)*
+
+```kotlin
+object ReplyActions {
+    suspend fun replyTo(
+        parent: EventHintBundle<TextNoteEvent>,
+        content: String,
+        signer: NostrSigner,
+    ): TextNoteEvent {
+        val template = TextNoteEvent.build(content, replyingTo = parent)
+        return signer.sign(template)
+    }
+}
+```
+
+Mirror `FollowActions.buildFollow` shape (`commons/.../actions/FollowActions.kt:69`).
+
+**Test:** `commons/src/commonTest/kotlin/com/vitorpamplona/amethyst/commons/actions/ReplyActionsTest.kt`
+— assert the signed event has:
+- A marked e-tag with `marker=reply` pointing at the parent id.
+- A marked e-tag with `marker=root` (pointing at parent's root if parent had one,
+  else parent's id).
+- All parent p-tags carried + parent's `pubKey` appended.
+
+Use `runTest { … }` from `kotlinx-coroutines-test`, in-test signer is
+`NostrSignerInternal(KeyPair(privHex.hexToByteArray()))` — match `FollowActionsTest.kt:25-37`.
+
+**Edit:** `desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/FeedScreen.kt` (~ line 1554) — replace inline build with `ReplyActions.replyTo(EventHintBundle(parentText, null), content, account.signer)`. Guard parent kind with `event as? TextNoteEvent`; if not a kind-1, skip / log (replies to non-kind-1 from the feed inline path were never well-defined and are out of scope; matches Android's `NotificationReplyReceiver.kt:136-156` routing).
+
+**Acceptance:**
+- [ ] `./gradlew :commons:jvmTest --tests "*ReplyActionsTest*"` green.
+- [ ] Manual: reply to a deep-thread note from desktop, inspect the broadcast event in a relay log → has `e-tag root` + `e-tag reply` + carries all parent `p` tags.
+- [ ] Reply renders in Damus/Primal under the correct thread.
+
+### Phase 2 — Extract reaction/follow/reply consume+broadcast couplet (Option B confirmed)
+
+Deepen-plan audit found **5 clean duplicate sites** with an ordering
+inconsistency between them:
+
+| File:line | Signer | Order today |
+|---|---|---|
+| `ThreadScreen.kt:361` | inline `TextNoteEvent.build` reply | consume → broadcast |
+| `ThreadScreen.kt:424` | `ReactionAction.reactTo` | broadcast → consume |
+| `FeedScreen.kt:426` | `FollowAction.follow` | broadcast → consume |
+| `FeedScreen.kt:1564` | inline `TextNoteEvent.build` reply | consume → broadcast |
+| `FeedScreen.kt:1617` | `ReactionAction.reactTo` | broadcast → consume |
+
+No site has inline extra work (snackbars, retries) entangled with the couplet.
+
+**Create:** `desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/cache/EventDispatch.kt`
+
+```kotlin
+/**
+ * Canonical local-first dispatch: write to the local cache before broadcasting
+ * so the UI reflects the user's action immediately, even if relay round-trips fail.
+ */
+suspend fun dispatch(
+    signed: Event,
+    localCache: DesktopLocalCache,
+    relayManager: RelayManager,
+) {
+    localCache.consume(signed, relay = null)
+    relayManager.broadcastToAll(signed)
+}
+```
+
+(Or, equivalent — as an extension on a small `DispatchContext` if the call
+sites already have one. Keep in `desktopApp` because both `LocalCache` and
+`RelayManager` are desktop-side types.)
+
+**Migrate all 5 sites** to call `dispatch(signed, localCache, relayManager)`.
+Fixes the ordering drift (everyone goes local-first) and shrinks call sites
+to one line.
+
+**Acceptance:**
+- [ ] `grep -rn "broadcastToAll" desktopApp/` shows only the call inside `EventDispatch.kt` + any non-couplet uses.
+- [ ] No remaining call sites do consume + broadcast inline (other than the helper).
+- [ ] Reactions, follows, and replies all still round-trip correctly in a manual sanity test.
+
+### Phase 3 — ZapFormatter swap (fixes #5)
+
+**Edit:** `RelatedContentRow.kt:137` —
+```kotlin
+zapCount = if (note.zapsAmount > BigDecimal.ZERO) showAmount(note.zapsAmount) else "",
+```
+
+**Edit:** `CommentItem.kt:155, 166-171` — replace `formatZapAmount(zapAmount)` with
+`zapAmount.toZapAmount()`. **Delete the private `formatZapAmount` fun at line 166-171.**
+
+**Edit:** `NoteActions.kt:264` — swap to `amount.toZapAmount()`. Verified
+sats (not msats): inputs are `ZAP_AMOUNTS = listOf(21L, 100L, 500L, 1000L, 5000L, 10000L)`
+at line 111 + `LnZapEvent.amount` which is sats per `LnZapEvent.kt:69`.
+**Delete the private `formatSats` fun if no remaining references** (run
+`grep -n formatSats desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/NoteActions.kt` after swap).
+
+**Skip:** `WalletColumnScreen.kt:979` `formatSats` is **intentional** — wallet
+balance display uses locale-aware grouping (`NumberFormat.getNumberInstance().format`)
+for full-precision sats. Out of review scope. Add a one-line `// intentional: wallet shows precise sats with locale grouping; not a ZapFormatter target` comment to prevent future drift.
+
+**Acceptance:**
+- [ ] `./gradlew :desktopApp:compileKotlin` green.
+- [ ] Visual: a note with 1.5M sats renders `1.5M` (or `1M`, matching commons
+      semantics), not `1500000`.
+
+### Phase 4 — Cache-aware Related (fixes #1)
+
+**Edit:** `RelatedContentRow.kt:83-145` — replace `DisposableEffect(noteId)` with
+`produceState` (Option A) keyed on `(noteId, authorPubKey, noteHashtags)`:
+
+```kotlin
+val relatedItems by produceState<List<CompactNoteData>>(
+    initialValue = emptyList(),
+    key1 = noteId, key2 = authorPubKey, key3 = noteHashtags,
+) {
+    val lowercaseTags = noteHashtags.map { it.lowercase() }.toSet()
+    fun rescan() {
+        runCatching {
+            value = scanRelated(localCache, noteId, authorPubKey, lowercaseTags)
+        }.onFailure {
+            // weakly-consistent iterator may rarely surface; skip this tick
+        }
+    }
+    rescan()
+    localCache.eventStream.newEventBundles.collect { bundle ->
+        val matters = bundle.any { n ->
+            n.event is TextNoteEvent &&
+            n.idHex != noteId &&
+            (n.event?.pubKey == authorPubKey ||
+             n.event?.tags?.isTaggedHashes(lowercaseTags) == true)
+        }
+        if (matters) rescan()
+    }
+}
+```
+
+Extract the existing scan body into a private top-level `scanRelated(...)` so
+both the initial call and the bundle-driven re-run share it.
+
+**Safety notes (deepen-plan):**
+- `LargeCache.notes` is `ConcurrentSkipListMap` (`LargeCache.jvmAndroid.kt:27`)
+  — weakly-consistent iterator, safe on main composition coroutine.
+- Scan is O(N): ~50–150ms for ~30k notes; fine on main.
+- No debounce: candidate-filter blocks 80–90% of bundles. Matches
+  `FeedViewModel.kt:54-59` precedent (collects same stream without debounce).
+- If hot-loop observed in production, retroactively add `.debounce(150)`
+  (precedent: `SearchBarState.kt:87`, `BookmarkListState.kt`).
+
+**Acceptance:**
+- [ ] Cold-cache repro: open a note in a fresh session, related section starts
+      empty; as kind-1 events stream in matching the hashtag or author, related
+      cards appear without collapse+re-expand.
+- [ ] No re-render storm: rescan only fires when a bundle contains a candidate.
+
+### Phase 5 — Focus gating (fixes #2)
+
+**Edit:** `DeckColumnContainer.kt:147-152` —
+```kotlin
+LaunchedEffect(Unit) { focusRequester.requestFocus() }   // once on column creation
+```
+
+That's the only effect change. **No explicit `requestFocus()` in the Escape
+handler**: deepen-plan focus-audit verified the column never loses focus during
+back-nav (Escape was received by the focused column → it still has focus after
+`navState.pop()`). Adding it would be cargo-cult.
+
+**Also edit:** `DeckLayout.kt:111` — wrap the `forEachIndexed` body in a
+`key(column.id) { DeckColumnContainer(...) }` so `LaunchedEffect(Unit)`
+survives column reordering. Without `key()`, moving a column in the deck list
+re-fires the effect for the wrong column instance.
+
+**Acceptance:**
+- [ ] Two-column repro: in column A's inline reply text field, type characters
+      while column B opens/closes an overlay → column A keeps focus, no
+      characters lost.
+- [ ] Escape still pops nested overlays in the focused column.
+- [ ] Reorder a column in the deck (drag if supported, or remove+re-add) →
+      typing focus in unrelated columns is preserved.
+
+## System-Wide Impact
+
+### Interaction graph
+
+- **Reply path:** `InlineReplyInput.onSend(content)` → `ReplyActions.replyTo(...)` (commons) → `signer.sign` → `localCache.consume` (DesktopLocalCache) → `relayManager.broadcastToAll` (NostrClient WS pool) → relay round-trip → cache update → `eventStream.newEventBundles` → Phase-4 `produceState` re-scan → related section refresh. Phase 4 is downstream of Phase 1 only by happy coincidence (a reply might match its parent's hashtags) — no hard coupling.
+- **Follow path:** unchanged, already routed through `FollowAction.follow`.
+- **Reaction path:** unchanged, already routed through `ReactionAction.reactTo`.
+
+### Error propagation
+
+- `ReplyActions.replyTo` is `suspend` and propagates `signer.sign` failures (cancellation, signer rejection). Desktop call site already runs in `withContext(Dispatchers.IO)` — wrap in `try/catch` to surface a snackbar on signing failure (Android path does this in `CommentPostViewModel.sendPostSync`; desktop currently swallows).
+- Phase 4 `produceState` collect runs in the column's coroutine scope; cancelled when composable leaves composition. Exceptions in `scanRelated` (e.g. ConcurrentModificationException on `LargeCache.forEach`) would crash the collector — wrap `rescan()` body in `runCatching` to skip on transient cache mutations.
+
+### State lifecycle risks
+
+- Phase 1: signed reply written to `localCache` before broadcast succeeds. If
+  the broadcast fails, the reply is visible locally but not on relays.
+  This matches existing behaviour for reaction/follow paths; no new risk.
+- Phase 4: `produceState` collects an unbounded `SharedFlow`. If `newEventBundles`
+  emits at high rate (cold cache fill), `scanRelated` runs O(N) per bundle.
+  `LargeCache.notes` size for an active user is ~10k–50k notes; a full scan is
+  ~ms. Acceptable; if hot-loop observed, debounce via `collectLatest` +
+  `delay(150)`.
+
+### API surface parity
+
+- `ReplyActions` is JVM-only consumer today (desktop), but lives in
+  `commons/commonMain` so Android can adopt it (and should — `NewPostViewModel`
+  on Android currently inlines a similar `TextNoteEvent.build` call). Tracked as
+  follow-up, **not in this PR**.
+
+### Integration test scenarios
+
+1. **NIP-10 thread fidelity:** create note A → reply B to A → reply C to B from
+   desktop. Inspect C's tags: must contain `["e", A.id, "", "root"]` and
+   `["e", B.id, "", "reply"]` and `["p", A.pubKey]` + `["p", B.pubKey]`.
+2. **Cold-cache related:** clear local DB, open a thread → Related row empty →
+   simulate incoming kind-1 events matching parent's hashtag → row populates
+   without user interaction.
+3. **Multi-column focus:** open two columns side by side. Start typing in column
+   A's inline reply. Open a profile overlay in column B. Verify typed characters
+   stay in column A.
+4. **Reply to non-kind-1:** open a thread whose root is a `LongFormContentEvent`
+   (kind 30023). Inline reply must either disable (preferred) or route through
+   `CommentEvent` (NIP-22) — open question below.
+5. **Zap formatting:** seed a note with 1_500_000 sats zaps. Both `RelatedContentRow`
+   and `CommentItem` render `1.5M` (or `1M` per commons rules).
+
+## Acceptance criteria (rollup)
+
+### Functional
+
+- [ ] Inline-reply event from desktop, when broadcast, threads correctly in
+      ≥1 non-Amethyst client (Damus or Primal verified).
+- [ ] Related section refreshes from cold cache without user interaction.
+- [ ] Typing in column A's reply box doesn't lose focus when column B opens an
+      overlay.
+- [ ] Zap totals render with k/M/G suffix in `RelatedContentRow` and
+      `CommentItem`.
+- [ ] Existing inline reaction/follow continue to work (no regression).
+
+### Non-functional
+
+- [ ] No new `--no-verify` commits.
+- [ ] `./gradlew spotlessApply` clean.
+- [ ] `./gradlew test` green for `:commons:jvmTest` and `:quartz:jvmTest`.
+- [ ] No new Kotlin warnings introduced.
+
+### Quality gates
+
+- [ ] `ReplyActionsTest` covers root-marker, reply-marker, p-tag carry.
+- [ ] Hand-rolled `formatZapAmount` deleted (grep returns 0 in `desktopApp/`).
+
+## Dependencies & risks
+
+| Risk | Likelihood | Mitigation |
+|---|---|---|
+| `EventHintBundle<TextNoteEvent>` cast fails when parent is `CommentEvent` / `LongFormContentEvent` | Med | Guard with `as? TextNoteEvent`; skip + log if null. Open question covers full support. |
+| `produceState` re-runs scan storm on cold cache fill | Low | Filter bundle for candidate match before rescan; debounce if observed. |
+| `LargeCache.forEach` concurrent modification during rescan | Low | Wrap rescan body in `runCatching`. |
+| Focus fix breaks ESC → back-nav inside a column | Low | Explicit `requestFocus()` in pop handler covers it; manual repro before push. |
+| `ZapFormatter.showAmount` returns `""` for amount < 0.01 — different from current `"0"`-on-empty | Low | Use `showAmountWithZero` if `"0"` desired, else gate with `if (note.zapsAmount > ZERO)`. |
+
+## Resolved questions (deepen-plan)
+
+All Q1–Q5 resolved — see "Enhancement summary" at top for verdicts + evidence.
+
+## Future work (separate PR, not in this branch)
+
+- **Android kind-1 reply migration.** Four Android sites inline
+  `TextNoteEvent.build` and should migrate to the new `ReplyActions.replyTo`
+  (single source of truth across platforms):
+  - `amethyst/.../ShortNotePostViewModel.kt:1037`
+  - `amethyst/.../VoiceReplyViewModel.kt:265`
+  - `amethyst/.../NotificationReplyReceiver.kt:203`
+  - `amethyst/.../AmethystAppFunctions.kt:1051`
+- **CLI `amy reply` verb.** `ReplyActions` lives in `commons/commonMain` and
+  is CLI-safe — a future Amy reply verb wires straight to it.
+- **Wallet vs Zap formatter consolidation.** `WalletColumnScreen.kt:979`
+  intentionally diverges (locale-aware full-precision). Revisit if/when a
+  unified "amount display" component is built.
+
+## Sources & references
+
+### Internal references
+
+- Review comment: https://github.com/vitorpamplona/amethyst/pull/3124#issuecomment-4599816576
+- PR: https://github.com/vitorpamplona/amethyst/pull/3124
+- `commons/ARCHITECTURE.md:73-88` — actions package boundary
+- `quartz/.../nip10Notes/TextNoteEvent.kt:142` — reply-aware build overload
+- `quartz/.../nip10Notes/tags/MarkedETag.kt:44-60` — NIP-10 marker enum + tag-array
+- `quartz/.../nip10Notes/tags/prepareETagsAsReplyTo.kt` — root/reply tag-carry helper
+- `commons/.../actions/FollowActions.kt:69` — pattern to mirror for `ReplyActions`
+- `commons/.../model/nip25Reactions/ReactionAction.kt:50` — sister action
+- `commons/.../util/ZapFormatter.kt` — shared zap-amount formatter
+- `desktopApp/.../cache/DesktopLocalCache.kt:719-743` — `eventStream.newEventBundles`
+- `desktopApp/.../ui/EditProfileScreen.kt:380` — `LaunchedEffect(Unit)` focus pattern to mirror
+- `amethyst/.../ui/note/nip22Comments/CommentPostViewModel.kt:128, 447-571` — Android reply path (NIP-22 reference, not directly reused)
+
+### CLAUDE.md conventions
+
+- "Check existing implementations first — most logic already exists" — confirmed: shared helpers exist; this is reuse, not new abstraction.
+- "Pre-commit hooks run spotless — always `./gradlew spotlessApply` before commit"
+- "Never use `--no-verify`"
+- "Verify, Don't Guess" — root causes verified by reading code at each line cited.