diff --git a/app/src/androidTest/java/com/m57/hermescontrol/ui/chat/TodoTaskCardTest.kt b/app/src/androidTest/java/com/m57/hermescontrol/ui/chat/TodoTaskCardTest.kt
index d86e945e..2a24f7b9 100644
--- a/app/src/androidTest/java/com/m57/hermescontrol/ui/chat/TodoTaskCardTest.kt
+++ b/app/src/androidTest/java/com/m57/hermescontrol/ui/chat/TodoTaskCardTest.kt
@@ -42,7 +42,7 @@ class TodoTaskCardTest {
 
         composeTestRule.setContent {
             HermesControlTheme {
-                ChatBubble(message = message, isDarkTheme = true)
+                ToolBubble(message = message)
             }
         }
 
@@ -66,7 +66,7 @@ class TodoTaskCardTest {
 
         composeTestRule.setContent {
             HermesControlTheme {
-                ChatBubble(message = message, isDarkTheme = true)
+                ToolBubble(message = message)
             }
         }
 
@@ -90,7 +90,7 @@ class TodoTaskCardTest {
 
         composeTestRule.setContent {
             HermesControlTheme {
-                ChatBubble(message = message, isDarkTheme = true)
+                ToolBubble(message = message)
             }
         }
 
@@ -113,7 +113,7 @@ class TodoTaskCardTest {
 
         composeTestRule.setContent {
             HermesControlTheme {
-                ChatBubble(message = message, isDarkTheme = true)
+                ToolBubble(message = message)
             }
         }
 
diff --git a/app/src/main/java/com/m57/hermescontrol/data/config/ServerStoreState.kt b/app/src/main/java/com/m57/hermescontrol/data/config/ServerStoreState.kt
index 5dd785a7..8616b737 100644
--- a/app/src/main/java/com/m57/hermescontrol/data/config/ServerStoreState.kt
+++ b/app/src/main/java/com/m57/hermescontrol/data/config/ServerStoreState.kt
@@ -1,7 +1,6 @@
 package com.m57.hermescontrol.data.config
 
 import com.m57.hermescontrol.data.model.PinnedModel
-import com.m57.hermescontrol.theme.ChatStyle
 import com.m57.hermescontrol.theme.ThemePreference
 import com.m57.hermescontrol.theme.ThemePreset
 import kotlinx.serialization.Serializable
@@ -22,9 +21,6 @@ data class ServerStoreState(
     val wsAuthParam: String = "token",
     val typingEffectEnabled: Boolean = true,
     val typingEffectDelayMs: Int = 30,
-    // Chat rendering style (issue #866): full-bleed renderer (default) or the
-    // legacy bubble renderer.
-    val chatStyle: ChatStyle = ChatStyle.FULL_BLEED,
     // App display language. "system" = follow device locale; otherwise a BCP-47
     // language code such as "en" or "ko". Applied via ContextWrapper in MainActivity.
     val appLanguage: String = "system",
diff --git a/app/src/main/java/com/m57/hermescontrol/data/local/AuthManager.kt b/app/src/main/java/com/m57/hermescontrol/data/local/AuthManager.kt
index e1ca8a8e..23d28756 100644
--- a/app/src/main/java/com/m57/hermescontrol/data/local/AuthManager.kt
+++ b/app/src/main/java/com/m57/hermescontrol/data/local/AuthManager.kt
@@ -17,7 +17,6 @@ import com.m57.hermescontrol.data.remote.CleartextPolicy
 import com.m57.hermescontrol.data.remote.CookieManager
 import com.m57.hermescontrol.data.remote.ServerEndpoint
 import com.m57.hermescontrol.data.session.ActiveSessionHolder
-import com.m57.hermescontrol.theme.ChatStyle
 import com.m57.hermescontrol.theme.ThemePreference
 import com.m57.hermescontrol.theme.ThemePreset
 import kotlinx.coroutines.CoroutineScope
@@ -75,9 +74,6 @@ object AuthManager {
     private val _themePresetFlow = MutableStateFlow<ThemePreset>(ThemePreset.DEFAULT)
     val themePresetFlow: StateFlow<ThemePreset> = _themePresetFlow.asStateFlow()
 
-    private val _chatStyleFlow = MutableStateFlow<ChatStyle>(ChatStyle.FULL_BLEED)
-    val chatStyleFlow: StateFlow<ChatStyle> = _chatStyleFlow.asStateFlow()
-
     private val _tokenFlow = MutableStateFlow<String?>(null)
     val tokenFlow: StateFlow<String?> = _tokenFlow.asStateFlow()
 
@@ -184,7 +180,6 @@ object AuthManager {
                     _themePreferenceFlow.value = state.themePreference
                     _useDynamicColorsFlow.value = state.useDynamicColors
                     _themePresetFlow.value = state.themePreset
-                    _chatStyleFlow.value = state.chatStyle
                     // B7 (Jul 08 2026, kanban t_470): keep cookie scope aligned with active profile.
                     appScope?.launch { syncCookieStoreForProfile(state.selectedProfileId) }
                 }
@@ -589,15 +584,6 @@ object AuthManager {
 
     fun getThemePreset(): ThemePreset = serverStore.getLatestState().themePreset
 
-    // ── Chat style (issue #866) ──────────────────────────────────────────
-
-    fun getChatStyle(): ChatStyle = serverStore.getLatestState().chatStyle
-
-    fun setChatStyle(style: ChatStyle) {
-        _chatStyleFlow.value = style
-        serverStore.update { it.copy(chatStyle = style) }
-    }
-
     fun setThemePreset(preset: ThemePreset) {
         serverStore.update { it.copy(themePreset = preset) }
     }
diff --git a/app/src/main/java/com/m57/hermescontrol/theme/ChatStyle.kt b/app/src/main/java/com/m57/hermescontrol/theme/ChatStyle.kt
deleted file mode 100644
index 5fdec866..00000000
--- a/app/src/main/java/com/m57/hermescontrol/theme/ChatStyle.kt
+++ /dev/null
@@ -1,11 +0,0 @@
-package com.m57.hermescontrol.theme
-
-/**
- * Chat message rendering style (issue #866). App-local preference,
- * persisted in [com.m57.hermescontrol.data.config.ServerStoreState].
- *
- * BUBBLES — legacy bubble renderer (default, unchanged behavior).
- * FULL_BLEED — agent prose renders directly on the background with turn
- *              headers; user messages keep bubbles (parallel renderer).
- */
-enum class ChatStyle { BUBBLES, FULL_BLEED }
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatBubble.kt b/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatBubble.kt
index e851c89b..f71e0e3d 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatBubble.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatBubble.kt
@@ -3,7 +3,6 @@ package com.m57.hermescontrol.ui.chat
 import android.content.ClipData
 import android.text.format.DateFormat
 import androidx.compose.animation.AnimatedVisibility
-import androidx.compose.animation.animateContentSize
 import androidx.compose.animation.core.Spring
 import androidx.compose.animation.core.spring
 import androidx.compose.animation.expandVertically
@@ -74,20 +73,22 @@ import com.m57.hermescontrol.theme.HermesStatusColors
 import com.m57.hermescontrol.theme.LightOnSurface
 import com.m57.hermescontrol.theme.LocalHermesStatusColors
 import com.m57.hermescontrol.theme.onColorFor
-import com.m57.hermescontrol.ui.chat.components.ReasoningCard
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import java.time.Instant
 import java.time.ZoneId
 import java.time.format.DateTimeFormatter
 
+/**
+ * The user-message bubble — the universal anchor in the full-bleed chat
+ * renderer (issue #866). Agent prose renders full-bleed; user messages keep
+ * this bubble so the conversation stays scannable.
+ */
 @Composable
 fun ChatBubble(
     message: ChatMessage,
-    isDarkTheme: Boolean,
     searchQuery: String = "",
     isCurrentMatch: Boolean = false,
-    onRespondApproval: (String) -> Unit = {},
     onOpenAttachment: (Attachment) -> Unit = {},
     onSaveAttachment: (Attachment) -> Unit = {},
     savingAttachmentPath: String? = null,
@@ -106,324 +107,133 @@ fun ChatBubble(
                     animationSpec = spring(stiffness = Spring.StiffnessMediumLow),
                 ),
     ) {
-        when (message.role) {
-            MessageRole.USER -> {
-                UserBubble(
-                    message = message,
-                    maxWidth = maxBubbleWidth,
-                    searchQuery = searchQuery,
-                    isCurrentMatch = isCurrentMatch,
-                    onOpenAttachment = onOpenAttachment,
-                    onSaveAttachment = onSaveAttachment,
-                    savingAttachmentPath = savingAttachmentPath,
-                    canSaveAttachment = canSaveAttachment,
-                    onImageClick = onImageClick,
-                    modifier = modifier,
-                )
-            }
+        val clipboard = LocalClipboard.current
+        val scope = rememberCoroutineScope()
+        var copied by remember { mutableStateOf(false) }
 
-            MessageRole.ASSISTANT -> {
-                AssistantBubble(
-                    message = message,
-                    maxWidth = maxBubbleWidth,
-                    isDarkTheme = isDarkTheme,
-                    searchQuery = searchQuery,
-                    isCurrentMatch = isCurrentMatch,
-                    onOpenAttachment = onOpenAttachment,
-                    onSaveAttachment = onSaveAttachment,
-                    savingAttachmentPath = savingAttachmentPath,
-                    canSaveAttachment = canSaveAttachment,
-                    onImageClick = onImageClick,
-                    modifier = modifier,
-                )
-            }
-
-            MessageRole.SYSTEM -> {
-                SystemBubble(
-                    message = message,
-                    onRespondApproval = onRespondApproval,
-                    modifier = modifier,
-                )
-            }
-
-            MessageRole.TOOL -> {
-                ToolBubble(message, modifier)
+        // Copy feedback: briefly show ✓ then revert
+        LaunchedEffect(copied) {
+            if (copied) {
+                delay(1500)
+                copied = false
             }
         }
-    }
-}
 
-@Composable
-private fun UserBubble(
-    message: ChatMessage,
-    maxWidth: androidx.compose.ui.unit.Dp,
-    searchQuery: String = "",
-    isCurrentMatch: Boolean = false,
-    onOpenAttachment: (Attachment) -> Unit = {},
-    onSaveAttachment: (Attachment) -> Unit = {},
-    savingAttachmentPath: String? = null,
-    canSaveAttachment: Boolean = true,
-    onImageClick: (ImageViewerModel) -> Unit = {},
-    modifier: Modifier = Modifier,
-) {
-    val clipboard = LocalClipboard.current
-    val scope = rememberCoroutineScope()
-    var copied by remember { mutableStateOf(false) }
+        val statusColors = LocalHermesStatusColors.current
 
-    // Copy feedback: briefly show ✓ then revert
-    LaunchedEffect(copied) {
-        if (copied) {
-            delay(1500)
-            copied = false
-        }
-    }
-
-    val statusColors = LocalHermesStatusColors.current
-
-    val highlightedText =
-        remember(message.content, searchQuery, isCurrentMatch, statusColors) {
-            if (searchQuery.isNotBlank()) {
-                buildHighlightedString(
-                    message.content,
-                    searchQuery,
-                    isCurrentMatch,
-                    statusColors,
-                )
-            } else {
-                AnnotatedString(message.content)
-            }
-        }
-    Box(
-        modifier =
-            modifier
-                .fillMaxWidth()
-                .padding(horizontal = 8.dp, vertical = 2.dp),
-        contentAlignment = Alignment.CenterEnd,
-    ) {
-        val primary = MaterialTheme.colorScheme.primary
-        val userBubbleTextColor =
-            if (primary.luminance() > 0.5f) {
-                if (MaterialTheme.colorScheme.onPrimary.luminance() < 0.5f) {
-                    MaterialTheme.colorScheme.onPrimary
+        val highlightedText =
+            remember(message.content, searchQuery, isCurrentMatch, statusColors) {
+                if (searchQuery.isNotBlank()) {
+                    buildHighlightedString(
+                        message.content,
+                        searchQuery,
+                        isCurrentMatch,
+                        statusColors,
+                    )
                 } else {
-                    LightOnSurface
-                }
-            } else {
-                if (MaterialTheme.colorScheme.onPrimary.luminance() > 0.5f) {
-                    MaterialTheme.colorScheme.onPrimary
-                } else {
-                    DarkOnSurface
+                    AnnotatedString(message.content)
                 }
             }
-        Box {
-            Surface(
-                modifier =
-                    Modifier
-                        .widthIn(max = maxWidth)
-                        .clip(
-                            RoundedCornerShape(
-                                topStart = 16.dp,
-                                topEnd = 16.dp,
-                                bottomStart = 16.dp,
-                                bottomEnd = 4.dp,
-                            ),
-                        ).background(color = primary)
-                        .testTag("chat_bubble_user"),
-                color = Color.Transparent,
-                tonalElevation = 0.dp,
-            ) {
-                Column(modifier = Modifier.padding(horizontal = 10.dp, vertical = 6.dp)) {
-                    SelectionContainer {
-                        Text(
-                            text = highlightedText,
-                            color = userBubbleTextColor,
-                            style = MaterialTheme.typography.bodyMedium,
-                        )
+        Box(
+            modifier =
+                modifier
+                    .fillMaxWidth()
+                    .padding(horizontal = 8.dp, vertical = 2.dp),
+            contentAlignment = Alignment.CenterEnd,
+        ) {
+            val primary = MaterialTheme.colorScheme.primary
+            val userBubbleTextColor =
+                if (primary.luminance() > 0.5f) {
+                    if (MaterialTheme.colorScheme.onPrimary.luminance() < 0.5f) {
+                        MaterialTheme.colorScheme.onPrimary
+                    } else {
+                        LightOnSurface
                     }
-                    // Render inline attachments
-                    if (!message.attachments.isNullOrEmpty()) {
-                        Spacer(modifier = Modifier.height(6.dp))
-                        message.attachments.forEach { attachment ->
-                            InlineAttachment(
-                                attachment = attachment,
-                                textColor = userBubbleTextColor,
-                                onOpen = { onOpenAttachment(it) },
-                                onSave = { onSaveAttachment(it) },
-                                savingPath = savingAttachmentPath,
-                                canSave = canSaveAttachment,
-                                onImageClick = onImageClick,
+                } else {
+                    if (MaterialTheme.colorScheme.onPrimary.luminance() > 0.5f) {
+                        MaterialTheme.colorScheme.onPrimary
+                    } else {
+                        DarkOnSurface
+                    }
+                }
+            Box {
+                Surface(
+                    modifier =
+                        Modifier
+                            .widthIn(max = maxBubbleWidth)
+                            .clip(
+                                RoundedCornerShape(
+                                    topStart = 16.dp,
+                                    topEnd = 16.dp,
+                                    bottomStart = 16.dp,
+                                    bottomEnd = 4.dp,
+                                ),
+                            ).background(color = primary)
+                            .testTag("chat_bubble_user"),
+                    color = Color.Transparent,
+                    tonalElevation = 0.dp,
+                ) {
+                    Column(modifier = Modifier.padding(horizontal = 10.dp, vertical = 6.dp)) {
+                        SelectionContainer {
+                            Text(
+                                text = highlightedText,
+                                color = userBubbleTextColor,
+                                style = MaterialTheme.typography.bodyMedium,
                             )
-                            Spacer(modifier = Modifier.height(4.dp))
                         }
-                    }
-                    if (!message.isStreaming) {
-                        Row(
-                            modifier =
-                                Modifier
-                                    .align(Alignment.End)
-                                    .padding(top = 4.dp),
-                            verticalAlignment = Alignment.CenterVertically,
-                        ) {
-                            IconButton(
-                                onClick = {
-                                    scope.launch {
-                                        clipboard.setClipEntry(ClipEntry(ClipData.newPlainText(null, message.content)))
-                                    }
-                                    copied = true
-                                },
-                                modifier = Modifier.size(20.dp),
+                        // Render inline attachments
+                        if (!message.attachments.isNullOrEmpty()) {
+                            Spacer(modifier = Modifier.height(6.dp))
+                            message.attachments.forEach { attachment ->
+                                InlineAttachment(
+                                    attachment = attachment,
+                                    textColor = userBubbleTextColor,
+                                    onOpen = { onOpenAttachment(it) },
+                                    onSave = { onSaveAttachment(it) },
+                                    savingPath = savingAttachmentPath,
+                                    canSave = canSaveAttachment,
+                                    onImageClick = onImageClick,
+                                )
+                                Spacer(modifier = Modifier.height(4.dp))
+                            }
+                        }
+                        if (!message.isStreaming) {
+                            Row(
+                                modifier =
+                                    Modifier
+                                        .align(Alignment.End)
+                                        .padding(top = 4.dp),
+                                verticalAlignment = Alignment.CenterVertically,
                             ) {
-                                Icon(
-                                    imageVector = if (copied) Icons.Filled.Check else Icons.Filled.ContentCopy,
-                                    contentDescription = stringResource(R.string.content_desc_copy),
-                                    modifier = Modifier.size(12.dp),
-                                    tint = userBubbleTextColor.copy(alpha = 0.7f),
+                                IconButton(
+                                    onClick = {
+                                        scope.launch {
+                                            clipboard.setClipEntry(
+                                                ClipEntry(ClipData.newPlainText(null, message.content)),
+                                            )
+                                        }
+                                        copied = true
+                                    },
+                                    modifier = Modifier.size(20.dp),
+                                ) {
+                                    Icon(
+                                        imageVector = if (copied) Icons.Filled.Check else Icons.Filled.ContentCopy,
+                                        contentDescription = stringResource(R.string.content_desc_copy),
+                                        modifier = Modifier.size(12.dp),
+                                        tint = userBubbleTextColor.copy(alpha = 0.7f),
+                                    )
+                                }
+                                Spacer(modifier = Modifier.width(2.dp))
+                                Text(
+                                    text =
+                                        formatTimestamp(
+                                            message.timestamp,
+                                            DateFormat.is24HourFormat(LocalContext.current),
+                                        ),
+                                    color = userBubbleTextColor.copy(alpha = 0.6f),
+                                    style = MaterialTheme.typography.labelSmall,
                                 )
                             }
-                            Spacer(modifier = Modifier.width(2.dp))
-                            Text(
-                                text =
-                                    formatTimestamp(
-                                        message.timestamp,
-                                        DateFormat.is24HourFormat(LocalContext.current),
-                                    ),
-                                color = userBubbleTextColor.copy(alpha = 0.6f),
-                                style = MaterialTheme.typography.labelSmall,
-                            )
-                        }
-                    }
-                }
-            }
-        }
-    }
-}
-
-@Composable
-private fun AssistantBubble(
-    message: ChatMessage,
-    maxWidth: androidx.compose.ui.unit.Dp,
-    isDarkTheme: Boolean,
-    searchQuery: String = "",
-    isCurrentMatch: Boolean = false,
-    onOpenAttachment: (Attachment) -> Unit = {},
-    onSaveAttachment: (Attachment) -> Unit = {},
-    savingAttachmentPath: String? = null,
-    canSaveAttachment: Boolean = true,
-    onImageClick: (ImageViewerModel) -> Unit = {},
-    modifier: Modifier = Modifier,
-) {
-    val bubbleColor = MaterialTheme.colorScheme.surfaceVariant
-    val textColor = MaterialTheme.colorScheme.onSurfaceVariant
-    val clipboard = LocalClipboard.current
-    val scope = rememberCoroutineScope()
-    var copied by remember { mutableStateOf(false) }
-
-    // Copy feedback: briefly show ✓ then revert
-    LaunchedEffect(copied) {
-        if (copied) {
-            delay(1500)
-            copied = false
-        }
-    }
-
-    Box(
-        modifier =
-            modifier
-                .fillMaxWidth()
-                .padding(horizontal = 8.dp, vertical = 2.dp),
-        contentAlignment = Alignment.CenterStart,
-    ) {
-        Box {
-            Surface(
-                modifier =
-                    Modifier
-                        .widthIn(max = maxWidth)
-                        .animateContentSize()
-                        .clip(
-                            RoundedCornerShape(
-                                topStart = 4.dp,
-                                topEnd = 16.dp,
-                                bottomStart = 16.dp,
-                                bottomEnd = 16.dp,
-                            ),
-                        ).testTag("chat_bubble_assistant"),
-                color = bubbleColor,
-                border =
-                    BorderStroke(
-                        width = 1.dp,
-                        color = MaterialTheme.colorScheme.outline.copy(alpha = 0.1f),
-                    ),
-                tonalElevation = 1.dp,
-            ) {
-                Column(modifier = Modifier.padding(horizontal = 10.dp, vertical = 6.dp)) {
-                    if (message.reasoningText.isNotBlank()) {
-                        ReasoningCard(
-                            reasoningText = message.reasoningText,
-                            isStreaming = message.isStreaming,
-                        )
-                        Spacer(modifier = Modifier.height(6.dp))
-                    }
-                    SelectionContainer {
-                        MarkdownText(
-                            text = message.content,
-                            textColor = textColor,
-                            isStreaming = message.isStreaming,
-                            searchQuery = searchQuery,
-                            isCurrentMatch = isCurrentMatch,
-                            onImageClick = onImageClick,
-                        )
-                    }
-                    // Render inline attachments (mirrors UserBubble so agent-delivered
-                    // media — images, files — shows in assistant bubbles too).
-                    if (!message.attachments.isNullOrEmpty()) {
-                        Spacer(modifier = Modifier.height(6.dp))
-                        message.attachments.forEach { attachment ->
-                            InlineAttachment(
-                                attachment = attachment,
-                                textColor = textColor,
-                                onOpen = { onOpenAttachment(it) },
-                                onSave = { onSaveAttachment(it) },
-                                savingPath = savingAttachmentPath,
-                                canSave = canSaveAttachment,
-                                onImageClick = onImageClick,
-                            )
-                            Spacer(modifier = Modifier.height(4.dp))
-                        }
-                    }
-                    if (!message.isStreaming) {
-                        Row(
-                            modifier =
-                                Modifier
-                                    .align(Alignment.End)
-                                    .padding(top = 4.dp),
-                            verticalAlignment = Alignment.CenterVertically,
-                        ) {
-                            IconButton(
-                                onClick = {
-                                    scope.launch {
-                                        clipboard.setClipEntry(ClipEntry(ClipData.newPlainText(null, message.content)))
-                                    }
-                                    copied = true
-                                },
-                                modifier = Modifier.size(20.dp),
-                            ) {
-                                Icon(
-                                    imageVector = if (copied) Icons.Filled.Check else Icons.Filled.ContentCopy,
-                                    contentDescription = stringResource(R.string.content_desc_copy),
-                                    modifier = Modifier.size(12.dp),
-                                    tint = textColor.copy(alpha = 0.6f),
-                                )
-                            }
-                            Spacer(modifier = Modifier.width(2.dp))
-                            Text(
-                                text =
-                                    formatTimestamp(
-                                        message.timestamp,
-                                        DateFormat.is24HourFormat(LocalContext.current),
-                                    ),
-                                color = textColor.copy(alpha = 0.5f),
-                                style = MaterialTheme.typography.labelSmall,
-                            )
                         }
                     }
                 }
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatScreen.kt b/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatScreen.kt
index 69091295..d630fc11 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatScreen.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatScreen.kt
@@ -81,13 +81,11 @@ import com.m57.hermescontrol.data.model.Attachment
 import com.m57.hermescontrol.data.model.AttachmentSource
 import com.m57.hermescontrol.data.ws.ConnectionStatus
 import com.m57.hermescontrol.data.ws.HermesWsClient
-import com.m57.hermescontrol.theme.ChatStyle
 import com.m57.hermescontrol.theme.LocalHermesStatusColors
 import com.m57.hermescontrol.ui.chat.components.ChatConnectionBanner
 import com.m57.hermescontrol.ui.chat.components.ChatInputBar
 import com.m57.hermescontrol.ui.chat.components.ChatLifecycleEffects
 import com.m57.hermescontrol.ui.chat.components.ChatLoadingOverlay
-import com.m57.hermescontrol.ui.chat.components.ChatMessageList
 import com.m57.hermescontrol.ui.chat.components.ChatResumeErrorOverlay
 import com.m57.hermescontrol.ui.chat.components.ChatScrollToBottomFab
 import com.m57.hermescontrol.ui.chat.components.ContextDetailSheet
@@ -580,59 +578,32 @@ fun ChatScreen(
                     }
                 }
 
-                when (state.chatStyle) {
-                    ChatStyle.BUBBLES ->
-                        ChatMessageList(
-                            messages = state.messages,
-                            streamingMessage = streamingState.streamingMessage,
-                            isSearchActive = state.isSearchActive,
-                            searchQuery = state.searchQuery,
-                            currentSearchMatchIndex = state.currentSearchMatchIndex,
-                            searchMatchIndices = state.searchMatchIndices,
-                            typingEffectEnabled = state.typingEffectEnabled,
-                            typingEffectDelayMs = state.typingEffectDelayMs,
-                            maxToolCallsPerTurn = state.maxToolCallsPerTurn,
-                            isLoading = state.isLoading,
-                            isLoadingOlder = state.isLoadingOlder,
-                            isDark = isDark,
-                            listState = listState,
-                            lastAnimatedMessageId = lastAnimatedMessageId,
-                            onLastAnimatedMessageIdChange = { lastAnimatedMessageId = it },
-                            viewModel = viewModel,
-                            clarifyRequest = state.clarifyRequest,
-                            onRespondClarify = viewModel::respondToClarify,
-                            onDismissClarify = viewModel::dismissClarify,
-                            onSaveAttachment = onSaveAttachment,
-                            savingAttachmentPath = pendingSavePath ?: state.savingAttachmentPath,
-                            onImageClick = { viewingImage = it },
-                        )
-
-                    ChatStyle.FULL_BLEED ->
-                        FullBleedChatList(
-                            messages = state.messages,
-                            streamingMessage = streamingState.streamingMessage,
-                            isSearchActive = state.isSearchActive,
-                            searchQuery = state.searchQuery,
-                            currentSearchMatchIndex = state.currentSearchMatchIndex,
-                            searchMatchIndices = state.searchMatchIndices,
-                            typingEffectEnabled = state.typingEffectEnabled,
-                            typingEffectDelayMs = state.typingEffectDelayMs,
-                            maxToolCallsPerTurn = state.maxToolCallsPerTurn,
-                            isLoading = state.isLoading,
-                            isLoadingOlder = state.isLoadingOlder,
-                            isDark = isDark,
-                            listState = listState,
-                            lastAnimatedMessageId = lastAnimatedMessageId,
-                            onLastAnimatedMessageIdChange = { lastAnimatedMessageId = it },
-                            viewModel = viewModel,
-                            clarifyRequest = state.clarifyRequest,
-                            onRespondClarify = viewModel::respondToClarify,
-                            onDismissClarify = viewModel::dismissClarify,
-                            onSaveAttachment = onSaveAttachment,
-                            savingAttachmentPath = pendingSavePath ?: state.savingAttachmentPath,
-                            onImageClick = { viewingImage = it },
-                        )
-                }
+                // Full-bleed chat renderer (issue #866) — the single chat
+                // surface since the bubble renderer was removed.
+                FullBleedChatList(
+                    messages = state.messages,
+                    streamingMessage = streamingState.streamingMessage,
+                    isSearchActive = state.isSearchActive,
+                    searchQuery = state.searchQuery,
+                    currentSearchMatchIndex = state.currentSearchMatchIndex,
+                    searchMatchIndices = state.searchMatchIndices,
+                    typingEffectEnabled = state.typingEffectEnabled,
+                    typingEffectDelayMs = state.typingEffectDelayMs,
+                    maxToolCallsPerTurn = state.maxToolCallsPerTurn,
+                    isLoading = state.isLoading,
+                    isLoadingOlder = state.isLoadingOlder,
+                    isDark = isDark,
+                    listState = listState,
+                    lastAnimatedMessageId = lastAnimatedMessageId,
+                    onLastAnimatedMessageIdChange = { lastAnimatedMessageId = it },
+                    viewModel = viewModel,
+                    clarifyRequest = state.clarifyRequest,
+                    onRespondClarify = viewModel::respondToClarify,
+                    onDismissClarify = viewModel::dismissClarify,
+                    onSaveAttachment = onSaveAttachment,
+                    savingAttachmentPath = pendingSavePath ?: state.savingAttachmentPath,
+                    onImageClick = { viewingImage = it },
+                )
 
                 // Loading overlay
                 ChatLoadingOverlay(isLoading = state.isLoading && state.resumeError == null)
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatViewModel.kt b/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatViewModel.kt
index ee4c92f3..0aa8d291 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatViewModel.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatViewModel.kt
@@ -33,7 +33,6 @@ import com.m57.hermescontrol.data.ws.HermesWsClient
 import com.m57.hermescontrol.data.ws.WsEvent
 import com.m57.hermescontrol.data.ws.WsMethods
 import com.m57.hermescontrol.data.ws.toJsonElement
-import com.m57.hermescontrol.theme.ChatStyle
 import com.m57.hermescontrol.ui.common.ActionProgressController
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
@@ -274,9 +273,6 @@ data class ChatUiState(
     // Cached settings
     val typingEffectEnabled: Boolean = true,
     val typingEffectDelayMs: Int = 30,
-    // Chat rendering style (issue #866), cached like the typing-effect
-    // settings so ChatScreen can pick the renderer without a store read.
-    val chatStyle: ChatStyle = ChatStyle.FULL_BLEED,
     // Commands catalog
     val commandCatalog: CommandCatalog = CommandCatalog(),
     // Per-command usage counts for the slash-autocomplete ranking (issue
@@ -1723,7 +1719,6 @@ class ChatViewModel(
             state.copy(
                 typingEffectEnabled = AuthManager.isTypingEffectEnabled(),
                 typingEffectDelayMs = AuthManager.getTypingEffectDelayMs(),
-                chatStyle = AuthManager.getChatStyle(),
             )
         }
     }
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatMessageList.kt b/app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatMessageList.kt
deleted file mode 100644
index 98198c3f..00000000
--- a/app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatMessageList.kt
+++ /dev/null
@@ -1,169 +0,0 @@
-package com.m57.hermescontrol.ui.chat.components
-
-import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.PaddingValues
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.size
-import androidx.compose.foundation.lazy.LazyColumn
-import androidx.compose.foundation.lazy.items
-import androidx.compose.foundation.lazy.itemsIndexed
-import androidx.compose.material3.CircularProgressIndicator
-import androidx.compose.runtime.Composable
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.unit.dp
-import com.m57.hermescontrol.R
-import com.m57.hermescontrol.ui.chat.ChatBubble
-import com.m57.hermescontrol.ui.chat.ChatMessage
-import com.m57.hermescontrol.ui.chat.ChatViewModel
-import com.m57.hermescontrol.ui.chat.ClarifyUi
-import com.m57.hermescontrol.ui.chat.ImageViewerModel
-import com.m57.hermescontrol.ui.chat.MessageRole
-import com.m57.hermescontrol.ui.chat.ToolCallDivider
-import com.m57.hermescontrol.ui.chat.toolCallMilestones
-import com.m57.hermescontrol.ui.common.EmptyState
-
-/**
- * The chat message list.
- */
-@Composable
-fun ChatMessageList(
-    messages: List<ChatMessage>,
-    streamingMessage: ChatMessage?,
-    isSearchActive: Boolean,
-    searchQuery: String,
-    currentSearchMatchIndex: Int,
-    searchMatchIndices: List<Int>,
-    typingEffectEnabled: Boolean,
-    typingEffectDelayMs: Int,
-    maxToolCallsPerTurn: Int? = null,
-    isLoading: Boolean,
-    isLoadingOlder: Boolean,
-    isDark: Boolean,
-    listState: androidx.compose.foundation.lazy.LazyListState,
-    lastAnimatedMessageId: String?,
-    onLastAnimatedMessageIdChange: (String?) -> Unit,
-    viewModel: ChatViewModel,
-    clarifyRequest: ClarifyUi? = null,
-    onRespondClarify: ((String) -> Unit)? = null,
-    onDismissClarify: (() -> Unit)? = null,
-    onSaveAttachment: (com.m57.hermescontrol.data.model.Attachment) -> Unit = {},
-    savingAttachmentPath: String? = null,
-    onImageClick: (ImageViewerModel) -> Unit = {},
-) {
-    if (messages.isEmpty() && !isLoading) {
-        Box(
-            modifier = Modifier.fillMaxSize(),
-            contentAlignment = Alignment.Center,
-        ) {
-            EmptyState(
-                title = stringResource(R.string.chat_empty_title),
-                subtitle = stringResource(R.string.chat_empty_subtitle),
-            )
-        }
-    } else {
-        val toolMilestones = toolCallMilestones(messages)
-        LazyColumn(
-            state = listState,
-            modifier = Modifier.fillMaxSize(),
-            contentPadding = PaddingValues(vertical = 8.dp),
-        ) {
-            if (isLoadingOlder) {
-                item(key = "loading-older") {
-                    Box(
-                        modifier = Modifier.fillMaxWidth().padding(12.dp),
-                        contentAlignment = Alignment.Center,
-                    ) {
-                        CircularProgressIndicator(modifier = Modifier.size(24.dp))
-                    }
-                }
-            }
-            itemsIndexed(
-                items = messages,
-                key = { _, message -> message.id },
-            ) { index, message ->
-                val isCurrentMatch =
-                    isSearchActive &&
-                        currentSearchMatchIndex >= 0 &&
-                        currentSearchMatchIndex < searchMatchIndices.size &&
-                        searchMatchIndices[currentSearchMatchIndex] == index
-
-                val isLastMessage = index == messages.lastIndex
-                val isAssistant = message.role == MessageRole.ASSISTANT
-
-                Column {
-                    if (typingEffectEnabled && isLastMessage && isAssistant && message.isStreaming &&
-                        lastAnimatedMessageId != message.id
-                    ) {
-                        StreamingBubbleWithTypingEffect(
-                            streaming = message,
-                            typingDelayMs = typingEffectDelayMs,
-                            isDark = isDark,
-                            onAnimationComplete = {
-                                onLastAnimatedMessageIdChange(message.id)
-                            },
-                        )
-                    } else {
-                        ChatBubble(
-                            message = message,
-                            isDarkTheme = isDark,
-                            searchQuery = if (isSearchActive) searchQuery else "",
-                            isCurrentMatch = isCurrentMatch,
-                            onRespondApproval = viewModel::respondToApproval,
-                            onOpenAttachment = viewModel::openAttachment,
-                            onSaveAttachment = onSaveAttachment,
-                            savingAttachmentPath = savingAttachmentPath,
-                            canSaveAttachment = savingAttachmentPath == null,
-                            onImageClick = onImageClick,
-                        )
-                    }
-                    // Subtle beat counter after every 5th tool call (issue #767).
-                    toolMilestones[index]?.let { count ->
-                        ToolCallDivider(count = count, maxPerTurn = maxToolCallsPerTurn)
-                    }
-                }
-            }
-
-            // Streaming message
-            streamingMessage?.let { streaming ->
-                item(key = "streaming-${streaming.id}") {
-                    if (typingEffectEnabled && streaming.isStreaming) {
-                        StreamingBubbleWithTypingEffect(
-                            streaming = streaming,
-                            typingDelayMs = typingEffectDelayMs,
-                            isDark = isDark,
-                        )
-                    } else {
-                        ChatBubble(
-                            message = streaming,
-                            isDarkTheme = isDark,
-                            searchQuery = "",
-                            isCurrentMatch = false,
-                            onOpenAttachment = viewModel::openAttachment,
-                            onSaveAttachment = onSaveAttachment,
-                            savingAttachmentPath = savingAttachmentPath,
-                            canSaveAttachment = savingAttachmentPath == null,
-                            onImageClick = onImageClick,
-                        )
-                    }
-                }
-            }
-
-            // Clarify bubble — rendered at the very bottom
-            if (clarifyRequest != null) {
-                item(key = "clarify_bubble") {
-                    ClarifyBubble(
-                        text = clarifyRequest.text,
-                        options = clarifyRequest.options,
-                        onOptionSelected = { option -> onRespondClarify?.invoke(option) },
-                        onDismiss = { onDismissClarify?.invoke() },
-                    )
-                }
-            }
-        }
-    }
-}
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatStreaming.kt b/app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatStreaming.kt
deleted file mode 100644
index c5002918..00000000
--- a/app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatStreaming.kt
+++ /dev/null
@@ -1,87 +0,0 @@
-package com.m57.hermescontrol.ui.chat.components
-
-import androidx.compose.foundation.layout.size
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableIntStateOf
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.rememberUpdatedState
-import androidx.compose.runtime.setValue
-import com.m57.hermescontrol.ui.chat.ChatBubble
-import com.m57.hermescontrol.ui.chat.ChatMessage
-import kotlinx.coroutines.delay
-
-/**
- * Wraps a streaming [ChatBubble] with a word-by-word typing reveal effect.
- * Shows words one at a time at [typingDelayMs] intervals while the message is
- * still streaming. When streaming completes the full text is shown immediately.
- * The underlying [ChatMessage.content] in state is never modified — this is a
- * display-only transformation.
- */
-@Composable
-fun StreamingBubbleWithTypingEffect(
-    streaming: ChatMessage,
-    typingDelayMs: Int,
-    isDark: Boolean,
-    onAnimationComplete: () -> Unit = {},
-) {
-    var visibleWordCount by remember { mutableIntStateOf(0) }
-    var caretVisible by remember { mutableStateOf(true) }
-    val currentContent = rememberUpdatedState(streaming.content)
-    val currentIsStreaming = rememberUpdatedState(streaming.isStreaming)
-    val currentDelayMs = rememberUpdatedState(typingDelayMs)
-
-    // Blinking typing caret while the message is still streaming.
-    LaunchedEffect(Unit) {
-        while (currentIsStreaming.value) {
-            delay(400)
-            caretVisible = !caretVisible
-        }
-        caretVisible = false
-    }
-
-    // Timer that ticks at the configured delay, incrementing the visible word
-    // count each tick. Stops ticking when streaming ends, then shows all words.
-    // Optimized: split is only called when waiting for new content, not per tick.
-    LaunchedEffect(Unit) {
-        var wordCount = 0
-        while (true) {
-            if (visibleWordCount < wordCount) {
-                delay(currentDelayMs.value.toLong())
-                visibleWordCount++
-            } else {
-                if (!currentIsStreaming.value) {
-                    onAnimationComplete()
-                    break
-                }
-                // Only split when we need to check for new content arriving
-                val words = currentContent.value.split(" ")
-                wordCount = words.size
-                if (visibleWordCount < wordCount) continue
-                delay(100) // was 10 — reduced from 100Hz to 10Hz
-            }
-        }
-        visibleWordCount = Int.MAX_VALUE
-    }
-
-    // Derive display text from the latest full content at each recomposition
-    val words = streaming.content.split(" ")
-    val visibleCount =
-        if (visibleWordCount >= Int.MAX_VALUE / 2) {
-            words.size
-        } else {
-            visibleWordCount.coerceIn(0, words.size)
-        }
-    val displayText =
-        words.take(visibleCount.coerceAtLeast(1)).joinToString(" ") +
-            if (caretVisible && currentIsStreaming.value) "▍" else ""
-
-    ChatBubble(
-        message = streaming.copy(content = displayText),
-        isDarkTheme = isDark,
-        searchQuery = "",
-        isCurrentMatch = false,
-    )
-}
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/chat/fullbleed/FullBleedChatList.kt b/app/src/main/java/com/m57/hermescontrol/ui/chat/fullbleed/FullBleedChatList.kt
index ae058c37..a2d53402 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/chat/fullbleed/FullBleedChatList.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/chat/fullbleed/FullBleedChatList.kt
@@ -28,12 +28,11 @@ import com.m57.hermescontrol.ui.chat.toolCallMilestones
 import com.m57.hermescontrol.ui.common.EmptyState
 
 /**
- * The chat message list for FULL-BLEED style (issue #866).
- *
- * Parallel renderer to [com.m57.hermescontrol.ui.chat.components.ChatMessageList]:
- * user messages keep their bubble (the universal anchor), agent turns render
- * full-bleed with a turn header, and tool rows / system events render as
- * distinct compact cards. Spacing contract:
+ * The chat message list for FULL-BLEED style (issue #866) — the single chat
+ * surface since the bubble renderer was removed. User messages keep their
+ * bubble (the universal anchor), agent turns render full-bleed with a turn
+ * header, and tool rows / system events render as distinct compact cards.
+ * Spacing contract:
  * - intra-turn: entries separated by 6.dp (Column padding on agent turn items)
  * - inter-turn: 12.dp bottom padding after each turn's last item
  *
@@ -112,7 +111,6 @@ fun FullBleedChatList(
                             Column(modifier = Modifier.padding(bottom = 12.dp)) {
                                 renderChatBubble(
                                     message = userMessage,
-                                    isDark = isDark,
                                     searchQuery = searchQuery,
                                     isCurrentMatch =
                                         isCurrentMatchFor(
@@ -259,7 +257,6 @@ fun FullBleedChatList(
 @Composable
 private fun renderChatBubble(
     message: ChatMessage,
-    isDark: Boolean,
     searchQuery: String,
     isCurrentMatch: Boolean,
     onOpenAttachment: (com.m57.hermescontrol.data.model.Attachment) -> Unit,
@@ -269,7 +266,6 @@ private fun renderChatBubble(
 ) {
     ChatBubble(
         message = message,
-        isDarkTheme = isDark,
         searchQuery = searchQuery,
         isCurrentMatch = isCurrentMatch,
         onOpenAttachment = onOpenAttachment,
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/chat/fullbleed/FullBleedStreaming.kt b/app/src/main/java/com/m57/hermescontrol/ui/chat/fullbleed/FullBleedStreaming.kt
index 64ae2680..a5db9d55 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/chat/fullbleed/FullBleedStreaming.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/chat/fullbleed/FullBleedStreaming.kt
@@ -13,8 +13,7 @@ import kotlinx.coroutines.delay
 
 /**
  * Wraps a streaming [FullBleedAgentMessage] with a word-by-word typing reveal
- * effect (full-bleed counterpart to
- * [com.m57.hermescontrol.ui.chat.components.StreamingBubbleWithTypingEffect]).
+ * effect (full-bleed counterpart to the removed bubble streaming wrapper).
  *
  * Shows words one at a time at [typingDelayMs] intervals while the message is
  * still streaming. When streaming completes the full text is shown
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/settings/SettingsSubPages.kt b/app/src/main/java/com/m57/hermescontrol/ui/settings/SettingsSubPages.kt
index 99b6df6a..6b42c352 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/settings/SettingsSubPages.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/settings/SettingsSubPages.kt
@@ -163,8 +163,6 @@ internal fun SettingsChatPage(
                 onTypingEffectEnabledChange = viewModel::onTypingEffectEnabledChange,
                 typingEffectDelayMs = state.typingEffectDelayMs,
                 onTypingEffectDelayMsChange = viewModel::onTypingEffectDelayMsChange,
-                chatStyle = state.chatStyle,
-                onChatStyleChange = viewModel::onChatStyleChange,
             )
         }
     }
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/settings/SettingsViewModel.kt b/app/src/main/java/com/m57/hermescontrol/ui/settings/SettingsViewModel.kt
index 8e5804fb..14b5eeda 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/settings/SettingsViewModel.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/settings/SettingsViewModel.kt
@@ -11,7 +11,6 @@ import com.m57.hermescontrol.data.remote.NetworkResult
 import com.m57.hermescontrol.data.remote.ServerEndpoint
 import com.m57.hermescontrol.data.remote.safeApiCall
 import com.m57.hermescontrol.data.ws.HermesWsClient
-import com.m57.hermescontrol.theme.ChatStyle
 import com.m57.hermescontrol.theme.ThemePreference
 import com.m57.hermescontrol.theme.ThemePreset
 import kotlinx.coroutines.CoroutineDispatcher
@@ -36,7 +35,6 @@ data class SettingsUiState(
     val isSaved: Boolean = false,
     val typingEffectEnabled: Boolean = false,
     val typingEffectDelayMs: Int = 30,
-    val chatStyle: ChatStyle = ChatStyle.FULL_BLEED,
     val profiles: List<ConnectionProfile> = emptyList(),
     val selectedProfileId: String? = null,
     val renameProfileName: String = "",
@@ -77,7 +75,6 @@ class SettingsViewModel(
         val themePreset = AuthManager.getThemePreset()
         val typingEffectEnabled = AuthManager.isTypingEffectEnabled()
         val typingEffectDelayMs = AuthManager.getTypingEffectDelayMs()
-        val chatStyle = AuthManager.getChatStyle()
         val profiles = AuthManager.getConnectionProfiles()
         val appLanguage = AuthManager.getAppLanguage()
         val renameProfileName =
@@ -97,7 +94,6 @@ class SettingsViewModel(
                 themePreset = themePreset,
                 typingEffectEnabled = typingEffectEnabled,
                 typingEffectDelayMs = typingEffectDelayMs,
-                chatStyle = chatStyle,
                 profiles = profiles,
                 selectedProfileId = selectedId,
                 renameProfileName = renameProfileName,
@@ -298,11 +294,6 @@ class SettingsViewModel(
         AuthManager.setTypingEffectDelayMs(delayMs)
     }
 
-    fun onChatStyleChange(style: ChatStyle) {
-        _uiState.update { it.copy(chatStyle = style, isSaved = false) }
-        AuthManager.setChatStyle(style)
-    }
-
     /** Clear all auth credentials — logs out and returns to landing screen. */
     fun logout() {
         AuthManager.setToken(null)
@@ -329,7 +320,6 @@ class SettingsViewModel(
         AuthManager.setThemePreset(state.themePreset)
         AuthManager.setTypingEffectEnabled(state.typingEffectEnabled)
         AuthManager.setTypingEffectDelayMs(state.typingEffectDelayMs)
-        AuthManager.setChatStyle(state.chatStyle)
         ApiClient.rebuild()
 
         viewModelScope.launch(ioDispatcher) {
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/settings/components/AppearanceSection.kt b/app/src/main/java/com/m57/hermescontrol/ui/settings/components/AppearanceSection.kt
index 8df6d38f..fa2c99ea 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/settings/components/AppearanceSection.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/settings/components/AppearanceSection.kt
@@ -32,7 +32,6 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import com.m57.hermescontrol.R
-import com.m57.hermescontrol.theme.ChatStyle
 import com.m57.hermescontrol.theme.ThemePreference
 import com.m57.hermescontrol.theme.ThemePreset
 import com.m57.hermescontrol.ui.settings.SectionCard
@@ -235,46 +234,8 @@ internal fun ChatSection(
     onTypingEffectEnabledChange: (Boolean) -> Unit,
     typingEffectDelayMs: Int,
     onTypingEffectDelayMsChange: (Int) -> Unit,
-    chatStyle: ChatStyle,
-    onChatStyleChange: (ChatStyle) -> Unit,
 ) {
     SectionCard {
-        // Chat rendering style (issue #866): bubble renderer (default) or the
-        // parallel full-bleed renderer. Kept at the top of the section — it's
-        // the primary chat-behavior choice.
-        Text(
-            text = stringResource(R.string.settings_item_chat_style),
-            style = MaterialTheme.typography.bodyLarge,
-        )
-        Text(
-            text = stringResource(R.string.settings_desc_chat_style),
-            style =
-                MaterialTheme.typography.bodySmall.copy(
-                    color = MaterialTheme.colorScheme.onSurfaceVariant,
-                ),
-        )
-        Spacer(modifier = Modifier.height(8.dp))
-        SingleChoiceSegmentedButtonRow(modifier = Modifier.fillMaxWidth()) {
-            ChatStyle.entries.forEachIndexed { index, style ->
-                SegmentedButton(
-                    selected = chatStyle == style,
-                    onClick = { onChatStyleChange(style) },
-                    shape =
-                        SegmentedButtonDefaults.itemShape(
-                            index = index,
-                            count = ChatStyle.entries.size,
-                        ),
-                ) {
-                    Text(
-                        when (style) {
-                            ChatStyle.BUBBLES -> stringResource(R.string.chat_style_bubbles)
-                            ChatStyle.FULL_BLEED -> stringResource(R.string.chat_style_full_bleed)
-                        },
-                    )
-                }
-            }
-        }
-
         Spacer(modifier = Modifier.height(16.dp))
 
         Row(
diff --git a/app/src/main/res/values-ko/strings.xml b/app/src/main/res/values-ko/strings.xml
index eee4dd73..7fde9d15 100644
--- a/app/src/main/res/values-ko/strings.xml
+++ b/app/src/main/res/values-ko/strings.xml
@@ -143,10 +143,6 @@
     <string name="settings_sec_chat">채팅</string>
     <string name="settings_item_typing_effect">타이핑 효과</string>
     <string name="settings_desc_typing_effect">새 메시지를 단어 단위로 애니메이션</string>
-    <string name="settings_item_chat_style">채팅 스타일</string>
-    <string name="settings_desc_chat_style">에이전트 응답 표시 방식</string>
-    <string name="chat_style_bubbles">버블</string>
-    <string name="chat_style_full_bleed">전체 폭</string>
     <string name="fullbleed_role_agent">어시스턴트</string>
     <string name="settings_item_typing_delay">지연: %1$d ms</string>
     <string name="settings_delay_10ms">10 ms</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 2bd91dc4..b0889bee 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -163,10 +163,6 @@
     <string name="settings_sec_chat">Chat</string>
     <string name="settings_item_typing_effect">Typing Effect</string>
     <string name="settings_desc_typing_effect">Animate new messages word by word</string>
-    <string name="settings_item_chat_style">Chat style</string>
-    <string name="settings_desc_chat_style">How agent replies are rendered</string>
-    <string name="chat_style_bubbles">Bubbles</string>
-    <string name="chat_style_full_bleed">Full-bleed</string>
     <string name="fullbleed_role_agent">Assistant</string>
     <string name="settings_item_typing_delay">Delay: %1$d ms</string>
     <string name="settings_delay_10ms">10 ms</string>
diff --git a/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatUpdateCommandTest.kt b/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatUpdateCommandTest.kt
index 2fe8049d..d8ceaff4 100644
--- a/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatUpdateCommandTest.kt
+++ b/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatUpdateCommandTest.kt
@@ -11,7 +11,6 @@ import com.m57.hermescontrol.data.ws.ConnectionStatus
 import com.m57.hermescontrol.data.ws.HermesWsClient
 import com.m57.hermescontrol.data.ws.WsEvent
 import com.m57.hermescontrol.data.ws.WsMethods
-import com.m57.hermescontrol.theme.ChatStyle
 import com.m57.hermescontrol.ui.chat.fakes.FakeChatPersistenceRepository
 import com.m57.hermescontrol.ui.chat.fakes.FakeSlashUsageStore
 import io.mockk.coEvery
@@ -90,7 +89,6 @@ class ChatUpdateCommandTest {
         every { AuthManager.getToken() } returns "test-token"
         every { AuthManager.isTypingEffectEnabled() } returns true
         every { AuthManager.getTypingEffectDelayMs() } returns 30
-        every { AuthManager.getChatStyle() } returns ChatStyle.BUBBLES
         every { AuthManager.isAutoReconnect() } returns false
         every { HermesWsClient.events } returns mockEventsFlow
         every { HermesWsClient.connectionStatus } returns mockConnectionStatus
diff --git a/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatViewModelTest.kt b/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatViewModelTest.kt
index 766854ad..65807b67 100644
--- a/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatViewModelTest.kt
+++ b/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatViewModelTest.kt
@@ -21,7 +21,6 @@ import com.m57.hermescontrol.data.ws.HermesWsClient
 import com.m57.hermescontrol.data.ws.JsonRpcError
 import com.m57.hermescontrol.data.ws.WsEvent
 import com.m57.hermescontrol.data.ws.WsMethods
-import com.m57.hermescontrol.theme.ChatStyle
 import com.m57.hermescontrol.ui.chat.fakes.FakeChatPersistenceRepository
 import com.m57.hermescontrol.ui.chat.fakes.FakeSlashUsageStore
 import io.mockk.*
@@ -129,7 +128,6 @@ class ChatViewModelTest {
         every { ProfileSwitchCoordinator.switched } returns mockSwitchFlow
         every { AuthManager.isTypingEffectEnabled() } returns true
         every { AuthManager.getTypingEffectDelayMs() } returns 30
-        every { AuthManager.getChatStyle() } returns ChatStyle.BUBBLES
         every { AuthManager.isAutoReconnect() } returns false
         every { HermesWsClient.events } returns mockEventsFlow
         every { HermesWsClient.connectionStatus } returns mockConnectionStatus
@@ -2718,7 +2716,6 @@ class ChatViewModelTest {
             // re-reads AuthManager live (the real regression scenario).
             every { AuthManager.isTypingEffectEnabled() } returns false
             every { AuthManager.getTypingEffectDelayMs() } returns 50
-            every { AuthManager.getChatStyle() } returns ChatStyle.BUBBLES
             viewModel.refreshSettings()
             advanceUntilIdle()
 
diff --git a/app/src/test/java/com/m57/hermescontrol/ui/chat/SlashCommandDispatchRpcTest.kt b/app/src/test/java/com/m57/hermescontrol/ui/chat/SlashCommandDispatchRpcTest.kt
index 46f7056c..7d4b367f 100644
--- a/app/src/test/java/com/m57/hermescontrol/ui/chat/SlashCommandDispatchRpcTest.kt
+++ b/app/src/test/java/com/m57/hermescontrol/ui/chat/SlashCommandDispatchRpcTest.kt
@@ -9,7 +9,6 @@ import com.m57.hermescontrol.data.ws.ConnectionStatus
 import com.m57.hermescontrol.data.ws.HermesWsClient
 import com.m57.hermescontrol.data.ws.WsEvent
 import com.m57.hermescontrol.data.ws.WsMethods
-import com.m57.hermescontrol.theme.ChatStyle
 import com.m57.hermescontrol.ui.chat.fakes.FakeChatPersistenceRepository
 import com.m57.hermescontrol.ui.chat.fakes.FakeSlashUsageStore
 import io.mockk.every
@@ -94,7 +93,6 @@ class SlashCommandDispatchRpcTest {
         every { AuthManager.getToken() } returns "test-token"
         every { AuthManager.isTypingEffectEnabled() } returns true
         every { AuthManager.getTypingEffectDelayMs() } returns 30
-        every { AuthManager.getChatStyle() } returns ChatStyle.BUBBLES
         every { AuthManager.isAutoReconnect() } returns false
         every { HermesWsClient.events } returns mockEventsFlow
         every { HermesWsClient.connectionStatus } returns mockConnectionStatus
diff --git a/app/src/test/java/com/m57/hermescontrol/ui/settings/SettingsViewModelTest.kt b/app/src/test/java/com/m57/hermescontrol/ui/settings/SettingsViewModelTest.kt
index f6b3a4dd..9c02a32a 100644
--- a/app/src/test/java/com/m57/hermescontrol/ui/settings/SettingsViewModelTest.kt
+++ b/app/src/test/java/com/m57/hermescontrol/ui/settings/SettingsViewModelTest.kt
@@ -3,7 +3,6 @@ package com.m57.hermescontrol.ui.settings
 import com.m57.hermescontrol.data.config.ConnectionProfile
 import com.m57.hermescontrol.data.local.AuthManager
 import com.m57.hermescontrol.data.remote.ApiClient
-import com.m57.hermescontrol.theme.ChatStyle
 import com.m57.hermescontrol.theme.ThemePreference
 import com.m57.hermescontrol.theme.ThemePreset
 import io.mockk.every
@@ -66,7 +65,6 @@ class SettingsViewModelTest {
         every { AuthManager.getThemePreset() } returns ThemePreset.DEFAULT
         every { AuthManager.isTypingEffectEnabled() } returns true
         every { AuthManager.getTypingEffectDelayMs() } returns 30
-        every { AuthManager.getChatStyle() } returns ChatStyle.BUBBLES
         every { AuthManager.getConnectionProfiles() } returns emptyList()
         every { AuthManager.getSelectedProfileId() } answers { storedSelectedProfileId }
         every { AuthManager.baseUrl() } returns "http://127.0.0.1:9119/"
@@ -121,7 +119,6 @@ class SettingsViewModelTest {
             every { AuthManager.getThemePreset() } returns ThemePreset.CATPPUCCIN
             every { AuthManager.isTypingEffectEnabled() } returns false
             every { AuthManager.getTypingEffectDelayMs() } returns 15
-            every { AuthManager.getChatStyle() } returns ChatStyle.BUBBLES
             every { AuthManager.getConnectionProfiles() } returns testProfiles
             every { AuthManager.getAppLanguage() } returns "fr"