feat(desktop): add multi-column deck layout replacing NavigationRail

Replace the 80dp NavigationRail + single content area with a TweetDeck-style
multi-column deck. Default layout: Home Feed + Notifications + Messages.

New deck system:
- DeckColumnType sealed class with 12 column types
- DeckState with StateFlow-based column management
- Per-column navigation stack for in-column drill-down
- Draggable dividers for column resize (300-800dp)
- Column config persisted via Jackson JSON in DesktopPreferences
- 48dp thin sidebar with add-column and settings buttons
- AddColumnDialog for picking column types

Keyboard shortcuts:
- Cmd+T: Add column
- Cmd+W: Close focused column
- Cmd+1-9: Focus column by index
- Cmd+Shift+Left/Right: Move column left/right

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/DesktopPreferences.kt

@@ -35,6 +35,7 @@ object DesktopPreferences {
 
     private const val KEY_FEED_MODE = "feed_mode"
     private const val KEY_LAST_SCREEN = "last_screen"
+    private const val KEY_DECK_COLUMNS = "deck_columns"
 
     var feedMode: FeedMode
         get() {
@@ -54,4 +55,10 @@ object DesktopPreferences {
         set(value) {
             prefs.put(KEY_LAST_SCREEN, value)
         }
+
+    var deckColumns: String
+        get() = prefs.get(KEY_DECK_COLUMNS, "")
+        set(value) {
+            prefs.put(KEY_DECK_COLUMNS, value)
+        }
 }

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/Main.kt

@@ -25,31 +25,20 @@ import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.automirrored.filled.Article
-import androidx.compose.material.icons.filled.Email
-import androidx.compose.material.icons.filled.Home
-import androidx.compose.material.icons.filled.Notifications
-import androidx.compose.material.icons.filled.Person
 import androidx.compose.material.icons.filled.Refresh
-import androidx.compose.material.icons.filled.Search
-import androidx.compose.material.icons.filled.Settings
 import androidx.compose.material3.Button
 import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.NavigationRail
-import androidx.compose.material3.NavigationRailItem
 import androidx.compose.material3.OutlinedButton
 import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.SnackbarHost
@@ -82,21 +71,16 @@ import com.vitorpamplona.amethyst.desktop.account.AccountManager
 import com.vitorpamplona.amethyst.desktop.account.AccountState
 import com.vitorpamplona.amethyst.desktop.cache.DesktopLocalCache
 import com.vitorpamplona.amethyst.desktop.model.DesktopDmRelayState
-import com.vitorpamplona.amethyst.desktop.model.DesktopIAccount
 import com.vitorpamplona.amethyst.desktop.network.DesktopRelayConnectionManager
 import com.vitorpamplona.amethyst.desktop.subscriptions.DesktopRelaySubscriptionsCoordinator
-import com.vitorpamplona.amethyst.desktop.ui.BookmarksScreen
 import com.vitorpamplona.amethyst.desktop.ui.ComposeNoteDialog
-import com.vitorpamplona.amethyst.desktop.ui.FeedScreen
 import com.vitorpamplona.amethyst.desktop.ui.LoginScreen
-import com.vitorpamplona.amethyst.desktop.ui.NotificationsScreen
-import com.vitorpamplona.amethyst.desktop.ui.ReadsScreen
-import com.vitorpamplona.amethyst.desktop.ui.SearchScreen
-import com.vitorpamplona.amethyst.desktop.ui.ThreadScreen
-import com.vitorpamplona.amethyst.desktop.ui.UserProfileScreen
 import com.vitorpamplona.amethyst.desktop.ui.ZapFeedback
-import com.vitorpamplona.amethyst.desktop.ui.chats.DesktopMessagesScreen
+import com.vitorpamplona.amethyst.desktop.ui.deck.AddColumnDialog
-import com.vitorpamplona.amethyst.desktop.ui.chats.DmSendTracker
+import com.vitorpamplona.amethyst.desktop.ui.deck.DeckColumnType
+import com.vitorpamplona.amethyst.desktop.ui.deck.DeckLayout
+import com.vitorpamplona.amethyst.desktop.ui.deck.DeckSidebar
+import com.vitorpamplona.amethyst.desktop.ui.deck.DeckState
 import com.vitorpamplona.amethyst.desktop.ui.profile.ProfileInfoCard
 import com.vitorpamplona.amethyst.desktop.ui.relay.RelayStatusCard
 import com.vitorpamplona.quartz.nip47WalletConnect.Nip47WalletConnect
@@ -109,7 +93,7 @@ import kotlinx.coroutines.launch
 private val isMacOS = System.getProperty("os.name").lowercase().contains("mac")
 
 /**
- * Desktop navigation state - extends AppScreen with dynamic destinations.
+ * Desktop navigation state — used for in-column navigation (drill-down).
  */
 sealed class DesktopScreen {
     object Feed : DesktopScreen()
@@ -147,7 +131,8 @@ fun main() =
             )
         var showComposeDialog by remember { mutableStateOf(false) }
         var replyToNote by remember { mutableStateOf<com.vitorpamplona.quartz.nip01Core.core.Event?>(null) }
-        var currentScreen by remember { mutableStateOf<DesktopScreen>(DesktopScreen.Feed) }
+        val deckState = remember { DeckState().also { it.load() } }
+        var showAddColumnDialog by remember { mutableStateOf(false) }
 
         Window(
             onCloseRequest = ::exitApplication,
@@ -175,7 +160,7 @@ fun main() =
                             } else {
                                 KeyShortcut(Key.Comma, ctrl = true)
                             },
-                        onClick = { currentScreen = DesktopScreen.Settings },
+                        onClick = { deckState.addColumn(DeckColumnType.Settings) },
                     )
                     Separator()
                     Item(
@@ -212,9 +197,102 @@ fun main() =
                     )
                 }
                 Menu("View") {
-                    Item("Feed", onClick = { })
+                    Item(
-                    Item("Messages", onClick = { })
+                        "Add Column",
-                    Item("Notifications", onClick = { })
+                        shortcut =
+                            if (isMacOS) {
+                                KeyShortcut(Key.T, meta = true)
+                            } else {
+                                KeyShortcut(Key.T, ctrl = true)
+                            },
+                        onClick = { showAddColumnDialog = true },
+                    )
+                    Item(
+                        "Close Column",
+                        shortcut =
+                            if (isMacOS) {
+                                KeyShortcut(Key.W, meta = true)
+                            } else {
+                                KeyShortcut(Key.W, ctrl = true)
+                            },
+                        onClick = {
+                            val cols = deckState.columns.value
+                            val idx = deckState.focusedColumnIndex.value
+                            if (cols.size > 1 && idx in cols.indices) {
+                                deckState.removeColumn(cols[idx].id)
+                            }
+                        },
+                    )
+                    Item(
+                        "Move Column Left",
+                        shortcut =
+                            if (isMacOS) {
+                                KeyShortcut(Key.DirectionLeft, meta = true, shift = true)
+                            } else {
+                                KeyShortcut(Key.DirectionLeft, ctrl = true, shift = true)
+                            },
+                        onClick = {
+                            val idx = deckState.focusedColumnIndex.value
+                            if (idx > 0) {
+                                deckState.moveColumn(idx, idx - 1)
+                                deckState.focusColumn(idx - 1)
+                            }
+                        },
+                    )
+                    Item(
+                        "Move Column Right",
+                        shortcut =
+                            if (isMacOS) {
+                                KeyShortcut(Key.DirectionRight, meta = true, shift = true)
+                            } else {
+                                KeyShortcut(Key.DirectionRight, ctrl = true, shift = true)
+                            },
+                        onClick = {
+                            val idx = deckState.focusedColumnIndex.value
+                            val size = deckState.columns.value.size
+                            if (idx < size - 1) {
+                                deckState.moveColumn(idx, idx + 1)
+                                deckState.focusColumn(idx + 1)
+                            }
+                        },
+                    )
+                    Separator()
+                    // Focus column by index (Cmd/Ctrl+1..9)
+                    val columnKeys =
+                        listOf(
+                            Key.One,
+                            Key.Two,
+                            Key.Three,
+                            Key.Four,
+                            Key.Five,
+                            Key.Six,
+                            Key.Seven,
+                            Key.Eight,
+                            Key.Nine,
+                        )
+                    columnKeys.forEachIndexed { i, key ->
+                        Item(
+                            "Column ${i + 1}",
+                            shortcut =
+                                if (isMacOS) {
+                                    KeyShortcut(key, meta = true)
+                                } else {
+                                    KeyShortcut(key, ctrl = true)
+                                },
+                            onClick = { deckState.focusColumn(i) },
+                        )
+                    }
+                    Separator()
+                    Menu("Add Column...") {
+                        Item("Home Feed", onClick = { deckState.addColumn(DeckColumnType.HomeFeed) })
+                        Item("Notifications", onClick = { deckState.addColumn(DeckColumnType.Notifications) })
+                        Item("Messages", onClick = { deckState.addColumn(DeckColumnType.Messages) })
+                        Item("Search", onClick = { deckState.addColumn(DeckColumnType.Search) })
+                        Item("Reads", onClick = { deckState.addColumn(DeckColumnType.Reads) })
+                        Item("Bookmarks", onClick = { deckState.addColumn(DeckColumnType.Bookmarks) })
+                        Item("Global Feed", onClick = { deckState.addColumn(DeckColumnType.GlobalFeed) })
+                        Item("Profile", onClick = { deckState.addColumn(DeckColumnType.MyProfile) })
+                    }
                 }
                 Menu("Help") {
                     Item("About Amethyst", onClick = { })
@@ -223,9 +301,9 @@ fun main() =
             }
 
             App(
-                currentScreen = currentScreen,
+                deckState = deckState,
-                onScreenChange = { currentScreen = it },
                 showComposeDialog = showComposeDialog,
+                showAddColumnDialog = showAddColumnDialog,
                 onShowComposeDialog = { showComposeDialog = true },
                 onShowReplyDialog = { event ->
                     replyToNote = event
@@ -235,6 +313,8 @@ fun main() =
                     showComposeDialog = false
                     replyToNote = null
                 },
+                onDismissAddColumnDialog = { showAddColumnDialog = false },
+                onShowAddColumnDialog = { showAddColumnDialog = true },
                 replyToNote = replyToNote,
             )
         }
@@ -242,12 +322,14 @@ fun main() =
 
 @Composable
 fun App(
-    currentScreen: DesktopScreen,
+    deckState: DeckState,
-    onScreenChange: (DesktopScreen) -> Unit,
     showComposeDialog: Boolean,
+    showAddColumnDialog: Boolean,
     onShowComposeDialog: () -> Unit,
     onShowReplyDialog: (com.vitorpamplona.quartz.nip01Core.core.Event) -> Unit,
     onDismissComposeDialog: () -> Unit,
+    onDismissAddColumnDialog: () -> Unit,
+    onShowAddColumnDialog: () -> Unit,
     replyToNote: com.vitorpamplona.quartz.nip01Core.core.Event?,
 ) {
     val relayManager = remember { DesktopRelayConnectionManager() }
@@ -329,7 +411,7 @@ fun App(
                 is AccountState.LoggedOut -> {
                     LoginScreen(
                         accountManager = accountManager,
-                        onLoginSuccess = { onScreenChange(DesktopScreen.Feed) },
+                        onLoginSuccess = { },
                     )
                 }
 
@@ -343,16 +425,17 @@ fun App(
                     }
 
                     MainContent(
-                        currentScreen = currentScreen,
+                        deckState = deckState,
-                        onScreenChange = onScreenChange,
                         relayManager = relayManager,
                         localCache = localCache,
                         accountManager = accountManager,
                         account = account,
                         nwcConnection = nwcConnection,
                         subscriptionsCoordinator = subscriptionsCoordinator,
+                        appScope = scope,
                         onShowComposeDialog = onShowComposeDialog,
                         onShowReplyDialog = onShowReplyDialog,
+                        onShowAddColumnDialog = onShowAddColumnDialog,
                     )
 
                     // Compose dialog
@@ -364,6 +447,17 @@ fun App(
                             replyTo = replyToNote,
                         )
                     }
+
+                    // Add column dialog
+                    if (showAddColumnDialog) {
+                        AddColumnDialog(
+                            onDismiss = onDismissAddColumnDialog,
+                            onAdd = { type ->
+                                deckState.addColumn(type)
+                                onDismissAddColumnDialog()
+                            },
+                        )
+                    }
                 }
             }
         }
@@ -372,16 +466,17 @@ fun App(
 
 @Composable
 fun MainContent(
-    currentScreen: DesktopScreen,
+    deckState: DeckState,
-    onScreenChange: (DesktopScreen) -> Unit,
     relayManager: DesktopRelayConnectionManager,
     localCache: DesktopLocalCache,
     accountManager: AccountManager,
     account: AccountState.LoggedIn,
     nwcConnection: Nip47WalletConnect.Nip47URINorm?,
     subscriptionsCoordinator: DesktopRelaySubscriptionsCoordinator,
+    appScope: CoroutineScope,
     onShowComposeDialog: () -> Unit,
     onShowReplyDialog: (com.vitorpamplona.quartz.nip01Core.core.Event) -> Unit,
+    onShowAddColumnDialog: () -> Unit,
 ) {
     val snackbarHostState = remember { SnackbarHostState() }
     val scope = rememberCoroutineScope()
@@ -402,227 +497,27 @@ fun MainContent(
 
     Box(Modifier.fillMaxSize()) {
         Row(Modifier.fillMaxSize()) {
-            // Sidebar Navigation
+            DeckSidebar(
-            NavigationRail(
+                onAddColumn = onShowAddColumnDialog,
-                modifier = Modifier.width(80.dp).fillMaxHeight(),
+                onOpenSettings = { deckState.addColumn(DeckColumnType.Settings) },
-                containerColor = MaterialTheme.colorScheme.surfaceVariant,
+            )
-            ) {
-                Spacer(Modifier.height(16.dp))
-
-                NavigationRailItem(
-                    icon = { Icon(Icons.Default.Home, contentDescription = "Feed") },
-                    label = { Text("Feed") },
-                    selected = currentScreen == DesktopScreen.Feed,
-                    onClick = { onScreenChange(DesktopScreen.Feed) },
-                )
-
-                NavigationRailItem(
-                    icon = { Icon(Icons.AutoMirrored.Filled.Article, contentDescription = "Reads") },
-                    label = { Text("Reads") },
-                    selected = currentScreen == DesktopScreen.Reads,
-                    onClick = { onScreenChange(DesktopScreen.Reads) },
-                )
-
-                NavigationRailItem(
-                    icon = { Icon(Icons.Default.Search, contentDescription = "Search") },
-                    label = { Text("Search") },
-                    selected = currentScreen == DesktopScreen.Search,
-                    onClick = { onScreenChange(DesktopScreen.Search) },
-                )
-
-                NavigationRailItem(
-                    icon = { Icon(com.vitorpamplona.amethyst.commons.icons.Bookmark, contentDescription = "Bookmarks") },
-                    label = { Text("Bookmarks") },
-                    selected = currentScreen == DesktopScreen.Bookmarks,
-                    onClick = { onScreenChange(DesktopScreen.Bookmarks) },
-                )
-
-                NavigationRailItem(
-                    icon = { Icon(Icons.Default.Email, contentDescription = "Messages") },
-                    label = { Text("DMs") },
-                    selected = currentScreen == DesktopScreen.Messages,
-                    onClick = { onScreenChange(DesktopScreen.Messages) },
-                )
-
-                NavigationRailItem(
-                    icon = { Icon(Icons.Default.Notifications, contentDescription = "Notifications") },
-                    label = { Text("Alerts") },
-                    selected = currentScreen == DesktopScreen.Notifications,
-                    onClick = { onScreenChange(DesktopScreen.Notifications) },
-                )
-
-                NavigationRailItem(
-                    icon = { Icon(Icons.Default.Person, contentDescription = "Profile") },
-                    label = { Text("Profile") },
-                    selected = currentScreen == DesktopScreen.MyProfile || currentScreen is DesktopScreen.UserProfile,
-                    onClick = { onScreenChange(DesktopScreen.MyProfile) },
-                )
-
-                Spacer(Modifier.weight(1f))
-
-                HorizontalDivider(Modifier.padding(horizontal = 16.dp))
-
-                NavigationRailItem(
-                    icon = { Icon(Icons.Default.Settings, contentDescription = "Settings") },
-                    label = { Text("Settings") },
-                    selected = currentScreen == DesktopScreen.Settings,
-                    onClick = { onScreenChange(DesktopScreen.Settings) },
-                )
-
-                Spacer(Modifier.height(16.dp))
-            }
 
             VerticalDivider()
 
-            // Main Content
+            DeckLayout(
-            Box(
+                deckState = deckState,
-                modifier = Modifier.weight(1f).fillMaxHeight().padding(24.dp),
+                relayManager = relayManager,
-            ) {
+                localCache = localCache,
-                when (currentScreen) {
+                accountManager = accountManager,
-                    DesktopScreen.Feed -> {
+                account = account,
-                        FeedScreen(
+                nwcConnection = nwcConnection,
-                            relayManager = relayManager,
+                subscriptionsCoordinator = subscriptionsCoordinator,
-                            localCache = localCache,
+                appScope = appScope,
-                            account = account,
+                onShowComposeDialog = onShowComposeDialog,
-                            nwcConnection = nwcConnection,
+                onShowReplyDialog = onShowReplyDialog,
-                            subscriptionsCoordinator = subscriptionsCoordinator,
+                onZapFeedback = onZapFeedback,
-                            onCompose = onShowComposeDialog,
+                modifier = Modifier.weight(1f),
-                            onNavigateToProfile = { pubKeyHex ->
+            )
-                                onScreenChange(DesktopScreen.UserProfile(pubKeyHex))
-                            },
-                            onNavigateToThread = { noteId ->
-                                onScreenChange(DesktopScreen.Thread(noteId))
-                            },
-                            onZapFeedback = onZapFeedback,
-                        )
-                    }
-
-                    DesktopScreen.Reads -> {
-                        ReadsScreen(
-                            relayManager = relayManager,
-                            localCache = localCache,
-                            account = account,
-                            onNavigateToProfile = { pubKeyHex ->
-                                onScreenChange(DesktopScreen.UserProfile(pubKeyHex))
-                            },
-                            onNavigateToArticle = { noteId ->
-                                onScreenChange(DesktopScreen.Thread(noteId))
-                            },
-                        )
-                    }
-
-                    DesktopScreen.Search -> {
-                        SearchScreen(
-                            localCache = localCache,
-                            relayManager = relayManager,
-                            subscriptionsCoordinator = subscriptionsCoordinator,
-                            onNavigateToProfile = { pubKeyHex ->
-                                onScreenChange(DesktopScreen.UserProfile(pubKeyHex))
-                            },
-                            onNavigateToThread = { noteId ->
-                                onScreenChange(DesktopScreen.Thread(noteId))
-                            },
-                        )
-                    }
-
-                    DesktopScreen.Bookmarks -> {
-                        BookmarksScreen(
-                            relayManager = relayManager,
-                            localCache = localCache,
-                            account = account,
-                            nwcConnection = nwcConnection,
-                            subscriptionsCoordinator = subscriptionsCoordinator,
-                            onNavigateToProfile = { pubKeyHex ->
-                                onScreenChange(DesktopScreen.UserProfile(pubKeyHex))
-                            },
-                            onNavigateToThread = { noteId ->
-                                onScreenChange(DesktopScreen.Thread(noteId))
-                            },
-                            onZapFeedback = onZapFeedback,
-                        )
-                    }
-
-                    DesktopScreen.Messages -> {
-                        val dmSendTracker =
-                            remember(relayManager) {
-                                DmSendTracker(relayManager.client)
-                            }
-                        val iAccount =
-                            remember(account, localCache, relayManager, dmSendTracker) {
-                                DesktopIAccount(account, localCache, relayManager, dmSendTracker, scope)
-                            }
-                        DesktopMessagesScreen(
-                            account = iAccount,
-                            cacheProvider = localCache,
-                            onNavigateToProfile = { pubKeyHex ->
-                                onScreenChange(DesktopScreen.UserProfile(pubKeyHex))
-                            },
-                        )
-                    }
-
-                    DesktopScreen.Notifications -> {
-                        NotificationsScreen(relayManager, account, subscriptionsCoordinator)
-                    }
-
-                    DesktopScreen.MyProfile -> {
-                        UserProfileScreen(
-                            pubKeyHex = account.pubKeyHex,
-                            relayManager = relayManager,
-                            localCache = localCache,
-                            account = account,
-                            nwcConnection = nwcConnection,
-                            subscriptionsCoordinator = subscriptionsCoordinator,
-                            onBack = { onScreenChange(DesktopScreen.Feed) },
-                            onCompose = onShowComposeDialog,
-                            onNavigateToProfile = { pubKeyHex ->
-                                onScreenChange(DesktopScreen.UserProfile(pubKeyHex))
-                            },
-                            onZapFeedback = onZapFeedback,
-                        )
-                    }
-
-                    is DesktopScreen.UserProfile -> {
-                        UserProfileScreen(
-                            pubKeyHex = currentScreen.pubKeyHex,
-                            relayManager = relayManager,
-                            localCache = localCache,
-                            account = account,
-                            nwcConnection = nwcConnection,
-                            subscriptionsCoordinator = subscriptionsCoordinator,
-                            onBack = { onScreenChange(DesktopScreen.Feed) },
-                            onCompose = onShowComposeDialog,
-                            onNavigateToProfile = { pubKeyHex ->
-                                onScreenChange(DesktopScreen.UserProfile(pubKeyHex))
-                            },
-                            onZapFeedback = onZapFeedback,
-                        )
-                    }
-
-                    is DesktopScreen.Thread -> {
-                        ThreadScreen(
-                            noteId = currentScreen.noteId,
-                            relayManager = relayManager,
-                            localCache = localCache,
-                            account = account,
-                            nwcConnection = nwcConnection,
-                            subscriptionsCoordinator = subscriptionsCoordinator,
-                            onBack = { onScreenChange(DesktopScreen.Feed) },
-                            onNavigateToProfile = { pubKeyHex ->
-                                onScreenChange(DesktopScreen.UserProfile(pubKeyHex))
-                            },
-                            onNavigateToThread = { noteId ->
-                                onScreenChange(DesktopScreen.Thread(noteId))
-                            },
-                            onZapFeedback = onZapFeedback,
-                            onReply = onShowReplyDialog,
-                        )
-                    }
-
-                    DesktopScreen.Settings -> {
-                        RelaySettingsScreen(relayManager, account, accountManager)
-                    }
-                }
-            }
         }
 
         // Snackbar for zap feedback

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/AddColumnDialog.kt

@@ -0,0 +1,162 @@
+/*
+ * 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.ui.deck
+
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.Button
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+
+private val COLUMN_OPTIONS =
+    listOf(
+        DeckColumnType.HomeFeed,
+        DeckColumnType.Notifications,
+        DeckColumnType.Messages,
+        DeckColumnType.Search,
+        DeckColumnType.Reads,
+        DeckColumnType.Bookmarks,
+        DeckColumnType.GlobalFeed,
+        DeckColumnType.MyProfile,
+    )
+
+@Composable
+fun AddColumnDialog(
+    onDismiss: () -> Unit,
+    onAdd: (DeckColumnType) -> Unit,
+) {
+    var hashtagInput by remember { mutableStateOf("") }
+    var showHashtagInput by remember { mutableStateOf(false) }
+
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = { Text("Add Column") },
+        text = {
+            Column {
+                if (showHashtagInput) {
+                    Text(
+                        "Enter hashtag:",
+                        style = MaterialTheme.typography.bodyMedium,
+                    )
+                    Spacer(Modifier.height(8.dp))
+                    OutlinedTextField(
+                        value = hashtagInput,
+                        onValueChange = { hashtagInput = it.removePrefix("#") },
+                        label = { Text("Hashtag") },
+                        placeholder = { Text("bitcoin") },
+                        singleLine = true,
+                        modifier = Modifier.fillMaxWidth(),
+                    )
+                } else {
+                    COLUMN_OPTIONS.forEach { type ->
+                        Row(
+                            modifier =
+                                Modifier
+                                    .fillMaxWidth()
+                                    .clickable { onAdd(type) }
+                                    .padding(vertical = 10.dp, horizontal = 4.dp),
+                            verticalAlignment = Alignment.CenterVertically,
+                            horizontalArrangement = Arrangement.Start,
+                        ) {
+                            Icon(
+                                imageVector = type.icon(),
+                                contentDescription = null,
+                                modifier = Modifier.size(20.dp),
+                                tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                            )
+                            Spacer(Modifier.width(12.dp))
+                            Text(
+                                type.title(),
+                                style = MaterialTheme.typography.bodyLarge,
+                            )
+                        }
+                    }
+
+                    Row(
+                        modifier =
+                            Modifier
+                                .fillMaxWidth()
+                                .clickable { showHashtagInput = true }
+                                .padding(vertical = 10.dp, horizontal = 4.dp),
+                        verticalAlignment = Alignment.CenterVertically,
+                    ) {
+                        Icon(
+                            imageVector = DeckColumnType.Hashtag("").icon(),
+                            contentDescription = null,
+                            modifier = Modifier.size(20.dp),
+                            tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                        )
+                        Spacer(Modifier.width(12.dp))
+                        Text(
+                            "Hashtag...",
+                            style = MaterialTheme.typography.bodyLarge,
+                        )
+                    }
+                }
+            }
+        },
+        confirmButton = {
+            if (showHashtagInput) {
+                Button(
+                    onClick = {
+                        if (hashtagInput.isNotBlank()) {
+                            onAdd(DeckColumnType.Hashtag(hashtagInput.trim()))
+                        }
+                    },
+                    enabled = hashtagInput.isNotBlank(),
+                ) {
+                    Text("Add")
+                }
+            }
+        },
+        dismissButton = {
+            TextButton(onClick = {
+                if (showHashtagInput) {
+                    showHashtagInput = false
+                } else {
+                    onDismiss()
+                }
+            }) {
+                Text(if (showHashtagInput) "Back" else "Cancel")
+            }
+        },
+    )
+}

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/ColumnHeader.kt

@@ -0,0 +1,129 @@
+/*
+ * 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.ui.deck
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.automirrored.filled.Article
+import androidx.compose.material.icons.filled.Close
+import androidx.compose.material.icons.filled.Email
+import androidx.compose.material.icons.filled.Home
+import androidx.compose.material.icons.filled.Notifications
+import androidx.compose.material.icons.filled.Person
+import androidx.compose.material.icons.filled.Public
+import androidx.compose.material.icons.filled.Search
+import androidx.compose.material.icons.filled.Settings
+import androidx.compose.material.icons.filled.Tag
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+
+@Composable
+fun ColumnHeader(
+    column: DeckColumn,
+    canClose: Boolean,
+    hasBackStack: Boolean,
+    onBack: () -> Unit,
+    onClose: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    Row(
+        modifier =
+            modifier
+                .fillMaxWidth()
+                .height(40.dp)
+                .background(MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.5f))
+                .padding(horizontal = 8.dp),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        if (hasBackStack) {
+            IconButton(onClick = onBack, modifier = Modifier.size(28.dp)) {
+                Icon(
+                    Icons.AutoMirrored.Filled.ArrowBack,
+                    contentDescription = "Back",
+                    modifier = Modifier.size(16.dp),
+                    tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+            }
+            Spacer(Modifier.width(4.dp))
+        }
+
+        Icon(
+            imageVector = column.type.icon(),
+            contentDescription = null,
+            modifier = Modifier.size(16.dp),
+            tint = MaterialTheme.colorScheme.onSurfaceVariant,
+        )
+
+        Spacer(Modifier.width(8.dp))
+
+        Text(
+            text = column.type.title(),
+            style = MaterialTheme.typography.labelLarge,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+            maxLines = 1,
+            overflow = TextOverflow.Ellipsis,
+            modifier = Modifier.weight(1f),
+        )
+
+        if (canClose) {
+            IconButton(onClick = onClose, modifier = Modifier.size(28.dp)) {
+                Icon(
+                    Icons.Default.Close,
+                    contentDescription = "Close column",
+                    modifier = Modifier.size(16.dp),
+                    tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+            }
+        }
+    }
+}
+
+fun DeckColumnType.icon(): ImageVector =
+    when (this) {
+        DeckColumnType.HomeFeed -> Icons.Default.Home
+        DeckColumnType.Notifications -> Icons.Default.Notifications
+        DeckColumnType.Messages -> Icons.Default.Email
+        DeckColumnType.Search -> Icons.Default.Search
+        DeckColumnType.Reads -> Icons.AutoMirrored.Filled.Article
+        DeckColumnType.Bookmarks -> com.vitorpamplona.amethyst.commons.icons.Bookmark
+        DeckColumnType.GlobalFeed -> Icons.Default.Public
+        DeckColumnType.MyProfile -> Icons.Default.Person
+        DeckColumnType.Settings -> Icons.Default.Settings
+        is DeckColumnType.Profile -> Icons.Default.Person
+        is DeckColumnType.Thread -> Icons.Default.Home
+        is DeckColumnType.Hashtag -> Icons.Default.Tag
+    }

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/DeckColumnContainer.kt

@@ -0,0 +1,365 @@
+/*
+ * 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.ui.deck
+
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import com.vitorpamplona.amethyst.desktop.DesktopScreen
+import com.vitorpamplona.amethyst.desktop.RelaySettingsScreen
+import com.vitorpamplona.amethyst.desktop.account.AccountManager
+import com.vitorpamplona.amethyst.desktop.account.AccountState
+import com.vitorpamplona.amethyst.desktop.cache.DesktopLocalCache
+import com.vitorpamplona.amethyst.desktop.model.DesktopIAccount
+import com.vitorpamplona.amethyst.desktop.network.DesktopRelayConnectionManager
+import com.vitorpamplona.amethyst.desktop.subscriptions.DesktopRelaySubscriptionsCoordinator
+import com.vitorpamplona.amethyst.desktop.ui.BookmarksScreen
+import com.vitorpamplona.amethyst.desktop.ui.FeedScreen
+import com.vitorpamplona.amethyst.desktop.ui.NotificationsScreen
+import com.vitorpamplona.amethyst.desktop.ui.ReadsScreen
+import com.vitorpamplona.amethyst.desktop.ui.SearchScreen
+import com.vitorpamplona.amethyst.desktop.ui.ThreadScreen
+import com.vitorpamplona.amethyst.desktop.ui.UserProfileScreen
+import com.vitorpamplona.amethyst.desktop.ui.ZapFeedback
+import com.vitorpamplona.amethyst.desktop.ui.chats.DesktopMessagesScreen
+import com.vitorpamplona.amethyst.desktop.ui.chats.DmSendTracker
+import com.vitorpamplona.quartz.nip47WalletConnect.Nip47WalletConnect.Nip47URINorm
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.MutableStateFlow
+
+class ColumnNavigationState {
+    private val _stack = MutableStateFlow<List<DesktopScreen>>(emptyList())
+    val stack = _stack
+
+    fun push(screen: DesktopScreen) {
+        _stack.value = _stack.value + screen
+    }
+
+    fun pop(): Boolean {
+        if (_stack.value.isEmpty()) return false
+        _stack.value = _stack.value.dropLast(1)
+        return true
+    }
+
+    fun clear() {
+        _stack.value = emptyList()
+    }
+}
+
+@Composable
+fun DeckColumnContainer(
+    column: DeckColumn,
+    canClose: Boolean,
+    onClose: () -> Unit,
+    relayManager: DesktopRelayConnectionManager,
+    localCache: DesktopLocalCache,
+    accountManager: AccountManager,
+    account: AccountState.LoggedIn,
+    nwcConnection: Nip47URINorm?,
+    subscriptionsCoordinator: DesktopRelaySubscriptionsCoordinator,
+    appScope: CoroutineScope,
+    onShowComposeDialog: () -> Unit,
+    onShowReplyDialog: (com.vitorpamplona.quartz.nip01Core.core.Event) -> Unit,
+    onZapFeedback: (ZapFeedback) -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    val navState = remember(column.id) { ColumnNavigationState() }
+    val navStack by navState.stack.collectAsState()
+    val currentOverlay = navStack.lastOrNull()
+
+    Column(
+        modifier =
+            modifier
+                .width(column.width.dp)
+                .fillMaxHeight(),
+    ) {
+        ColumnHeader(
+            column = column,
+            canClose = canClose,
+            hasBackStack = navStack.isNotEmpty(),
+            onBack = { navState.pop() },
+            onClose = onClose,
+        )
+
+        HorizontalDivider()
+
+        Box(
+            modifier = Modifier.fillMaxSize().padding(12.dp),
+        ) {
+            if (currentOverlay != null) {
+                OverlayContent(
+                    screen = currentOverlay,
+                    relayManager = relayManager,
+                    localCache = localCache,
+                    account = account,
+                    nwcConnection = nwcConnection,
+                    subscriptionsCoordinator = subscriptionsCoordinator,
+                    onShowComposeDialog = onShowComposeDialog,
+                    onShowReplyDialog = onShowReplyDialog,
+                    onZapFeedback = onZapFeedback,
+                    onNavigateToProfile = { navState.push(DesktopScreen.UserProfile(it)) },
+                    onNavigateToThread = { navState.push(DesktopScreen.Thread(it)) },
+                    onBack = { navState.pop() },
+                )
+            } else {
+                RootContent(
+                    columnType = column.type,
+                    relayManager = relayManager,
+                    localCache = localCache,
+                    accountManager = accountManager,
+                    account = account,
+                    nwcConnection = nwcConnection,
+                    subscriptionsCoordinator = subscriptionsCoordinator,
+                    appScope = appScope,
+                    onShowComposeDialog = onShowComposeDialog,
+                    onShowReplyDialog = onShowReplyDialog,
+                    onZapFeedback = onZapFeedback,
+                    onNavigateToProfile = { navState.push(DesktopScreen.UserProfile(it)) },
+                    onNavigateToThread = { navState.push(DesktopScreen.Thread(it)) },
+                )
+            }
+        }
+    }
+}
+
+@Composable
+private fun RootContent(
+    columnType: DeckColumnType,
+    relayManager: DesktopRelayConnectionManager,
+    localCache: DesktopLocalCache,
+    accountManager: AccountManager,
+    account: AccountState.LoggedIn,
+    nwcConnection: Nip47URINorm?,
+    subscriptionsCoordinator: DesktopRelaySubscriptionsCoordinator,
+    appScope: CoroutineScope,
+    onShowComposeDialog: () -> Unit,
+    onShowReplyDialog: (com.vitorpamplona.quartz.nip01Core.core.Event) -> Unit,
+    onZapFeedback: (ZapFeedback) -> Unit,
+    onNavigateToProfile: (String) -> Unit,
+    onNavigateToThread: (String) -> Unit,
+) {
+    val scope = rememberCoroutineScope()
+
+    when (columnType) {
+        DeckColumnType.HomeFeed -> {
+            FeedScreen(
+                relayManager = relayManager,
+                localCache = localCache,
+                account = account,
+                nwcConnection = nwcConnection,
+                subscriptionsCoordinator = subscriptionsCoordinator,
+                onCompose = onShowComposeDialog,
+                onNavigateToProfile = onNavigateToProfile,
+                onNavigateToThread = onNavigateToThread,
+                onZapFeedback = onZapFeedback,
+            )
+        }
+
+        DeckColumnType.Notifications -> {
+            NotificationsScreen(relayManager, account, subscriptionsCoordinator)
+        }
+
+        DeckColumnType.Messages -> {
+            val dmSendTracker =
+                remember(relayManager) {
+                    DmSendTracker(relayManager.client)
+                }
+            val iAccount =
+                remember(account, localCache, relayManager, dmSendTracker) {
+                    DesktopIAccount(account, localCache, relayManager, dmSendTracker, appScope)
+                }
+            DesktopMessagesScreen(
+                account = iAccount,
+                cacheProvider = localCache,
+                onNavigateToProfile = onNavigateToProfile,
+            )
+        }
+
+        DeckColumnType.Search -> {
+            SearchScreen(
+                localCache = localCache,
+                relayManager = relayManager,
+                subscriptionsCoordinator = subscriptionsCoordinator,
+                onNavigateToProfile = onNavigateToProfile,
+                onNavigateToThread = onNavigateToThread,
+            )
+        }
+
+        DeckColumnType.Reads -> {
+            ReadsScreen(
+                relayManager = relayManager,
+                localCache = localCache,
+                account = account,
+                onNavigateToProfile = onNavigateToProfile,
+                onNavigateToArticle = onNavigateToThread,
+            )
+        }
+
+        DeckColumnType.Bookmarks -> {
+            BookmarksScreen(
+                relayManager = relayManager,
+                localCache = localCache,
+                account = account,
+                nwcConnection = nwcConnection,
+                subscriptionsCoordinator = subscriptionsCoordinator,
+                onNavigateToProfile = onNavigateToProfile,
+                onNavigateToThread = onNavigateToThread,
+                onZapFeedback = onZapFeedback,
+            )
+        }
+
+        DeckColumnType.GlobalFeed -> {
+            FeedScreen(
+                relayManager = relayManager,
+                localCache = localCache,
+                account = account,
+                nwcConnection = nwcConnection,
+                subscriptionsCoordinator = subscriptionsCoordinator,
+                onCompose = onShowComposeDialog,
+                onNavigateToProfile = onNavigateToProfile,
+                onNavigateToThread = onNavigateToThread,
+                onZapFeedback = onZapFeedback,
+            )
+        }
+
+        DeckColumnType.MyProfile -> {
+            UserProfileScreen(
+                pubKeyHex = account.pubKeyHex,
+                relayManager = relayManager,
+                localCache = localCache,
+                account = account,
+                nwcConnection = nwcConnection,
+                subscriptionsCoordinator = subscriptionsCoordinator,
+                onBack = {},
+                onCompose = onShowComposeDialog,
+                onNavigateToProfile = onNavigateToProfile,
+                onZapFeedback = onZapFeedback,
+            )
+        }
+
+        DeckColumnType.Settings -> {
+            RelaySettingsScreen(relayManager, account, accountManager)
+        }
+
+        is DeckColumnType.Profile -> {
+            UserProfileScreen(
+                pubKeyHex = columnType.pubKeyHex,
+                relayManager = relayManager,
+                localCache = localCache,
+                account = account,
+                nwcConnection = nwcConnection,
+                subscriptionsCoordinator = subscriptionsCoordinator,
+                onBack = {},
+                onCompose = onShowComposeDialog,
+                onNavigateToProfile = onNavigateToProfile,
+                onZapFeedback = onZapFeedback,
+            )
+        }
+
+        is DeckColumnType.Thread -> {
+            ThreadScreen(
+                noteId = columnType.noteId,
+                relayManager = relayManager,
+                localCache = localCache,
+                account = account,
+                nwcConnection = nwcConnection,
+                subscriptionsCoordinator = subscriptionsCoordinator,
+                onBack = {},
+                onNavigateToProfile = onNavigateToProfile,
+                onNavigateToThread = onNavigateToThread,
+                onZapFeedback = onZapFeedback,
+                onReply = onShowReplyDialog,
+            )
+        }
+
+        is DeckColumnType.Hashtag -> {
+            SearchScreen(
+                localCache = localCache,
+                relayManager = relayManager,
+                subscriptionsCoordinator = subscriptionsCoordinator,
+                onNavigateToProfile = onNavigateToProfile,
+                onNavigateToThread = onNavigateToThread,
+            )
+        }
+    }
+}
+
+@Composable
+private fun OverlayContent(
+    screen: DesktopScreen,
+    relayManager: DesktopRelayConnectionManager,
+    localCache: DesktopLocalCache,
+    account: AccountState.LoggedIn,
+    nwcConnection: Nip47URINorm?,
+    subscriptionsCoordinator: DesktopRelaySubscriptionsCoordinator,
+    onShowComposeDialog: () -> Unit,
+    onShowReplyDialog: (com.vitorpamplona.quartz.nip01Core.core.Event) -> Unit,
+    onZapFeedback: (ZapFeedback) -> Unit,
+    onNavigateToProfile: (String) -> Unit,
+    onNavigateToThread: (String) -> Unit,
+    onBack: () -> Unit,
+) {
+    when (screen) {
+        is DesktopScreen.UserProfile -> {
+            UserProfileScreen(
+                pubKeyHex = screen.pubKeyHex,
+                relayManager = relayManager,
+                localCache = localCache,
+                account = account,
+                nwcConnection = nwcConnection,
+                subscriptionsCoordinator = subscriptionsCoordinator,
+                onBack = onBack,
+                onCompose = onShowComposeDialog,
+                onNavigateToProfile = onNavigateToProfile,
+                onZapFeedback = onZapFeedback,
+            )
+        }
+
+        is DesktopScreen.Thread -> {
+            ThreadScreen(
+                noteId = screen.noteId,
+                relayManager = relayManager,
+                localCache = localCache,
+                account = account,
+                nwcConnection = nwcConnection,
+                subscriptionsCoordinator = subscriptionsCoordinator,
+                onBack = onBack,
+                onNavigateToProfile = onNavigateToProfile,
+                onNavigateToThread = onNavigateToThread,
+                onZapFeedback = onZapFeedback,
+                onReply = onShowReplyDialog,
+            )
+        }
+
+        else -> {}
+    }
+}

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/DeckColumnType.kt

@@ -0,0 +1,93 @@
+/*
+ * 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.ui.deck
+
+import java.util.UUID
+
+sealed class DeckColumnType {
+    object HomeFeed : DeckColumnType()
+
+    object Notifications : DeckColumnType()
+
+    object Messages : DeckColumnType()
+
+    object Search : DeckColumnType()
+
+    object Reads : DeckColumnType()
+
+    object Bookmarks : DeckColumnType()
+
+    object GlobalFeed : DeckColumnType()
+
+    object MyProfile : DeckColumnType()
+
+    object Settings : DeckColumnType()
+
+    data class Profile(
+        val pubKeyHex: String,
+    ) : DeckColumnType()
+
+    data class Thread(
+        val noteId: String,
+    ) : DeckColumnType()
+
+    data class Hashtag(
+        val tag: String,
+    ) : DeckColumnType()
+
+    fun title(): String =
+        when (this) {
+            HomeFeed -> "Home"
+            Notifications -> "Notifications"
+            Messages -> "Messages"
+            Search -> "Search"
+            Reads -> "Reads"
+            Bookmarks -> "Bookmarks"
+            GlobalFeed -> "Global"
+            MyProfile -> "Profile"
+            Settings -> "Settings"
+            is Profile -> "Profile"
+            is Thread -> "Thread"
+            is Hashtag -> "#$tag"
+        }
+
+    fun typeKey(): String =
+        when (this) {
+            HomeFeed -> "home"
+            Notifications -> "notifications"
+            Messages -> "messages"
+            Search -> "search"
+            Reads -> "reads"
+            Bookmarks -> "bookmarks"
+            GlobalFeed -> "global"
+            MyProfile -> "my_profile"
+            Settings -> "settings"
+            is Profile -> "profile"
+            is Thread -> "thread"
+            is Hashtag -> "hashtag"
+        }
+}
+
+data class DeckColumn(
+    val id: String = UUID.randomUUID().toString(),
+    val type: DeckColumnType,
+    val width: Float = 400f,
+)

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/DeckLayout.kt

@@ -0,0 +1,122 @@
+/*
+ * 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.ui.deck
+
+import androidx.compose.foundation.gestures.detectDragGestures
+import androidx.compose.foundation.horizontalScroll
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.VerticalDivider
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.pointer.PointerIcon
+import androidx.compose.ui.input.pointer.pointerHoverIcon
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.unit.dp
+import com.vitorpamplona.amethyst.desktop.account.AccountManager
+import com.vitorpamplona.amethyst.desktop.account.AccountState
+import com.vitorpamplona.amethyst.desktop.cache.DesktopLocalCache
+import com.vitorpamplona.amethyst.desktop.network.DesktopRelayConnectionManager
+import com.vitorpamplona.amethyst.desktop.subscriptions.DesktopRelaySubscriptionsCoordinator
+import com.vitorpamplona.amethyst.desktop.ui.ZapFeedback
+import com.vitorpamplona.quartz.nip47WalletConnect.Nip47WalletConnect.Nip47URINorm
+import kotlinx.coroutines.CoroutineScope
+import java.awt.Cursor
+
+@Composable
+fun DeckLayout(
+    deckState: DeckState,
+    relayManager: DesktopRelayConnectionManager,
+    localCache: DesktopLocalCache,
+    accountManager: AccountManager,
+    account: AccountState.LoggedIn,
+    nwcConnection: Nip47URINorm?,
+    subscriptionsCoordinator: DesktopRelaySubscriptionsCoordinator,
+    appScope: CoroutineScope,
+    onShowComposeDialog: () -> Unit,
+    onShowReplyDialog: (com.vitorpamplona.quartz.nip01Core.core.Event) -> Unit,
+    onZapFeedback: (ZapFeedback) -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    val columns by deckState.columns.collectAsState()
+    val scrollState = rememberScrollState()
+
+    Row(
+        modifier = modifier.fillMaxSize().horizontalScroll(scrollState),
+    ) {
+        columns.forEachIndexed { index, column ->
+            if (index > 0) {
+                DraggableDivider(
+                    onDrag = { delta ->
+                        val leftCol = columns[index - 1]
+                        val rightCol = columns[index]
+                        deckState.updateColumnWidth(leftCol.id, leftCol.width + delta)
+                        deckState.updateColumnWidth(rightCol.id, rightCol.width - delta)
+                    },
+                )
+            }
+
+            DeckColumnContainer(
+                column = column,
+                canClose = columns.size > 1,
+                onClose = { deckState.removeColumn(column.id) },
+                relayManager = relayManager,
+                localCache = localCache,
+                accountManager = accountManager,
+                account = account,
+                nwcConnection = nwcConnection,
+                subscriptionsCoordinator = subscriptionsCoordinator,
+                appScope = appScope,
+                onShowComposeDialog = onShowComposeDialog,
+                onShowReplyDialog = onShowReplyDialog,
+                onZapFeedback = onZapFeedback,
+            )
+        }
+    }
+}
+
+@Composable
+private fun DraggableDivider(onDrag: (Float) -> Unit) {
+    Box(
+        modifier =
+            Modifier
+                .width(4.dp)
+                .fillMaxHeight()
+                .pointerHoverIcon(PointerIcon(Cursor(Cursor.E_RESIZE_CURSOR)))
+                .pointerInput(Unit) {
+                    detectDragGestures { change, dragAmount ->
+                        change.consume()
+                        onDrag(dragAmount.x / density)
+                    }
+                },
+    ) {
+        VerticalDivider(
+            color = MaterialTheme.colorScheme.outlineVariant,
+        )
+    }
+}

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/DeckSidebar.kt

@@ -0,0 +1,89 @@
+/*
+ * 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.ui.deck
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Add
+import androidx.compose.material.icons.filled.Settings
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+
+@Composable
+fun DeckSidebar(
+    onAddColumn: () -> Unit,
+    onOpenSettings: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    Column(
+        modifier =
+            modifier
+                .width(48.dp)
+                .fillMaxHeight()
+                .background(MaterialTheme.colorScheme.surfaceVariant)
+                .padding(vertical = 8.dp),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.Top,
+    ) {
+        Text(
+            "A",
+            style = MaterialTheme.typography.titleLarge,
+            fontWeight = FontWeight.Bold,
+            color = MaterialTheme.colorScheme.primary,
+            fontSize = 20.sp,
+        )
+
+        Spacer(Modifier.size(16.dp))
+
+        IconButton(onClick = onAddColumn) {
+            Icon(
+                Icons.Default.Add,
+                contentDescription = "Add Column",
+                tint = MaterialTheme.colorScheme.onSurfaceVariant,
+            )
+        }
+
+        Spacer(Modifier.weight(1f))
+
+        IconButton(onClick = onOpenSettings) {
+            Icon(
+                Icons.Default.Settings,
+                contentDescription = "Settings",
+                tint = MaterialTheme.colorScheme.onSurfaceVariant,
+            )
+        }
+    }
+}

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/deck/DeckState.kt

@@ -0,0 +1,163 @@
+/*
+ * 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.ui.deck
+
+import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
+import com.fasterxml.jackson.module.kotlin.readValue
+import com.vitorpamplona.amethyst.desktop.DesktopPreferences
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+
+class DeckState {
+    private val _columns = MutableStateFlow(DEFAULT_COLUMNS)
+    val columns: StateFlow<List<DeckColumn>> = _columns.asStateFlow()
+
+    private val _focusedColumnIndex = MutableStateFlow(0)
+    val focusedColumnIndex: StateFlow<Int> = _focusedColumnIndex.asStateFlow()
+
+    fun addColumn(
+        type: DeckColumnType,
+        afterIndex: Int? = null,
+    ) {
+        val col = DeckColumn(type = type)
+        _columns.value =
+            if (afterIndex != null && afterIndex < _columns.value.size) {
+                _columns.value.toMutableList().apply { add(afterIndex + 1, col) }
+            } else {
+                _columns.value + col
+            }
+        save()
+    }
+
+    fun removeColumn(id: String) {
+        if (_columns.value.size <= 1) return
+        _columns.value = _columns.value.filter { it.id != id }
+        if (_focusedColumnIndex.value >= _columns.value.size) {
+            _focusedColumnIndex.value = _columns.value.size - 1
+        }
+        save()
+    }
+
+    fun moveColumn(
+        fromIndex: Int,
+        toIndex: Int,
+    ) {
+        val list = _columns.value.toMutableList()
+        if (fromIndex !in list.indices || toIndex !in list.indices) return
+        val item = list.removeAt(fromIndex)
+        list.add(toIndex, item)
+        _columns.value = list
+        save()
+    }
+
+    fun updateColumnWidth(
+        id: String,
+        width: Float,
+    ) {
+        _columns.value =
+            _columns.value.map {
+                if (it.id == id) it.copy(width = width.coerceIn(MIN_COLUMN_WIDTH, MAX_COLUMN_WIDTH)) else it
+            }
+        save()
+    }
+
+    fun focusColumn(index: Int) {
+        if (index in _columns.value.indices) {
+            _focusedColumnIndex.value = index
+        }
+    }
+
+    fun save() {
+        try {
+            val data =
+                _columns.value.map { col ->
+                    mapOf(
+                        "id" to col.id,
+                        "type" to col.type.typeKey(),
+                        "width" to col.width,
+                        "param" to
+                            when (col.type) {
+                                is DeckColumnType.Profile -> col.type.pubKeyHex
+                                is DeckColumnType.Thread -> col.type.noteId
+                                is DeckColumnType.Hashtag -> col.type.tag
+                                else -> null
+                            },
+                    )
+                }
+            DesktopPreferences.deckColumns = mapper.writeValueAsString(data)
+        } catch (_: Exception) {
+        }
+    }
+
+    fun load() {
+        try {
+            val json = DesktopPreferences.deckColumns
+            if (json.isBlank()) return
+            val data: List<Map<String, Any?>> = mapper.readValue(json)
+            val loaded =
+                data.mapNotNull { entry ->
+                    val type = parseColumnType(entry) ?: return@mapNotNull null
+                    val id = entry["id"] as? String ?: return@mapNotNull null
+                    val width = (entry["width"] as? Number)?.toFloat() ?: 400f
+                    DeckColumn(id = id, type = type, width = width.coerceIn(MIN_COLUMN_WIDTH, MAX_COLUMN_WIDTH))
+                }
+            if (loaded.isNotEmpty()) {
+                _columns.value = loaded
+            }
+        } catch (_: Exception) {
+        }
+    }
+
+    companion object {
+        const val MIN_COLUMN_WIDTH = 300f
+        const val MAX_COLUMN_WIDTH = 800f
+
+        val DEFAULT_COLUMNS =
+            listOf(
+                DeckColumn(type = DeckColumnType.HomeFeed),
+                DeckColumn(type = DeckColumnType.Notifications),
+                DeckColumn(type = DeckColumnType.Messages),
+            )
+
+        private val mapper = jacksonObjectMapper()
+
+        private fun parseColumnType(entry: Map<String, Any?>): DeckColumnType? {
+            val typeKey = entry["type"] as? String ?: return null
+            val param = entry["param"] as? String
+            return when (typeKey) {
+                "home" -> DeckColumnType.HomeFeed
+                "notifications" -> DeckColumnType.Notifications
+                "messages" -> DeckColumnType.Messages
+                "search" -> DeckColumnType.Search
+                "reads" -> DeckColumnType.Reads
+                "bookmarks" -> DeckColumnType.Bookmarks
+                "global" -> DeckColumnType.GlobalFeed
+                "my_profile" -> DeckColumnType.MyProfile
+                "settings" -> DeckColumnType.Settings
+                "profile" -> param?.let { DeckColumnType.Profile(it) }
+                "thread" -> param?.let { DeckColumnType.Thread(it) }
+                "hashtag" -> param?.let { DeckColumnType.Hashtag(it) }
+                else -> null
+            }
+        }
+    }
+}