fix: revert SpeechQueue TTS batching, keep TTS text cleaning

Reverted the sentence-batching SpeechQueue that caused duplicate playback.
TTS now uses the original simple approach: speak full text once on Final.
Retained: parenthetical content stripping + emoji removal for cleaner TTS output.

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

android/app/src/main/java/com/tiangong/aiagent/data/remote/dto/Dtos.kt

@@ -51,6 +51,7 @@ data class AgentResponse(
     val id: String,
     val name: String,
     val description: String?,
+    val avatar: String? = null,
     @SerializedName("workflow_config") val workflowConfig: Map<String, Any?>?,
     @SerializedName("budget_config") val budgetConfig: Map<String, Any?>?,
     val version: Int = 1,
@@ -268,7 +269,8 @@ data class AsrResponse(
 
 data class TtsRequest(
     val text: String,
-    val voice: String = "alloy"
+    val voice: String = "xiaoxiao",
+    val speed: Float = 1.0f
 )
 
 data class TtsResponse(

android/app/src/main/java/com/tiangong/aiagent/data/repository/AgentRepository.kt

@@ -25,6 +25,7 @@ class AgentRepository @Inject constructor(
                         id = dto.id,
                         name = dto.name ?: "",
                         description = dto.description ?: "",
+                        avatar = dto.avatar,
                         status = dto.status ?: "published",
                         userId = dto.userId,
                         version = dto.version,
@@ -50,6 +51,7 @@ class AgentRepository @Inject constructor(
                     id = dto.id,
                     name = dto.name ?: "",
                     description = dto.description ?: "",
+                    avatar = dto.avatar,
                     status = dto.status ?: "published",
                     userId = dto.userId,
                     version = dto.version,
@@ -150,6 +152,7 @@ class AgentRepository @Inject constructor(
         id = id,
         name = name ?: "",
         description = description ?: "",
+        avatar = avatar,
         status = status ?: "published",
         userId = userId,
         version = version,

android/app/src/main/java/com/tiangong/aiagent/domain/model/Agent.kt

@@ -8,5 +8,6 @@ data class Agent(
     val userId: String? = null,
     val version: Int = 1,
     val createdAt: String = "",
-    val updatedAt: String = ""
+    val updatedAt: String = "",
+    val avatar: String? = null  // emoji or image URL
 )

android/app/src/main/java/com/tiangong/aiagent/ui/chat/ChatScreen.kt

@@ -2,6 +2,7 @@ package com.tiangong.aiagent.ui.chat
 
 import android.net.Uri
 import android.util.Log
+import androidx.activity.compose.BackHandler
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.PickVisualMediaRequest
 import androidx.activity.result.contract.ActivityResultContracts
@@ -74,6 +75,11 @@ fun ChatScreen(
     // Drawer state
     val drawerState = rememberDrawerState(initialValue = DrawerValue.Closed)
 
+    // Close drawer on system back press
+    BackHandler(enabled = drawerState.isOpen) {
+        scope.launch { drawerState.close() }
+    }
+
     // Track first load for skeleton
     LaunchedEffect(uiState.messages.size, uiState.isStreaming) {
         if (uiState.messages.isNotEmpty() || uiState.isStreaming || uiState.currentAgent != null) {
@@ -663,7 +669,11 @@ fun ChatScreen(
                                 if (showFeedback) {
                                     val clipboardManager = LocalClipboardManager.current
                                     Column {
-                                        MessageBubbleFromUi(message = message)
+                                        MessageBubbleFromUi(
+                                            message = message,
+                                            agentName = uiState.currentAgent?.name ?: "助手",
+                                            agentAvatar = uiState.currentAgent?.avatar
+                                        )
                                         Row(
                                             modifier = Modifier.padding(start = 56.dp, bottom = 4.dp),
                                             horizontalArrangement = Arrangement.spacedBy(4.dp),
@@ -794,7 +804,11 @@ fun ChatScreen(
                                     // User message: show bubble with copy & share actions
                                     val clipboardManager = LocalClipboardManager.current
                                     Column {
-                                        MessageBubbleFromUi(message = message)
+                                        MessageBubbleFromUi(
+                                            message = message,
+                                            agentName = uiState.currentAgent?.name ?: "助手",
+                                            agentAvatar = uiState.currentAgent?.avatar
+                                        )
                                         Row(
                                             modifier = Modifier.padding(end = 16.dp, bottom = 4.dp),
                                             horizontalArrangement = Arrangement.End,
@@ -904,8 +918,16 @@ fun ChatScreen(
 
 /** Thin adapter to render UiMessage via existing MessageBubble. */
 @Composable
-private fun MessageBubbleFromUi(message: UiMessage) {
-    com.tiangong.aiagent.ui.chat.components.MessageBubble(message = message.toDomainMessage())
+private fun MessageBubbleFromUi(
+    message: UiMessage,
+    agentName: String = "助手",
+    agentAvatar: String? = null
+) {
+    com.tiangong.aiagent.ui.chat.components.MessageBubble(
+        message = message.toDomainMessage(),
+        agentName = agentName,
+        agentAvatar = agentAvatar
+    )
 }
 
 private fun UiMessage.toDomainMessage(): com.tiangong.aiagent.domain.model.Message {

android/app/src/main/java/com/tiangong/aiagent/ui/chat/ChatViewModel.kt

@@ -437,8 +437,12 @@ class ChatViewModel @Inject constructor(
             return
         }
 
-        // Capture agent context at call time to avoid any race condition
+        // Guard: don't send without an agent (prevents routing to non-existent bare SSE endpoint)
         val agentId = _uiState.value.currentAgent?.id
+        if (agentId == null) {
+            _uiState.value = _uiState.value.copy(error = "请先选择一个智能体")
+            return
+        }
         val sessionId = _uiState.value.sessionId ?: UUID.randomUUID().toString()
 
         // Analytics: track message send
@@ -999,6 +1003,7 @@ class ChatViewModel @Inject constructor(
         super.onCleared()
         sseJob?.cancel()
         historyFlowJob?.cancel()
+        audioPlayer.release()
         audioRecorder.cleanup()
         persistSession()
     }

android/app/src/main/java/com/tiangong/aiagent/ui/chat/components/MessageBubble.kt

@@ -9,8 +9,12 @@ import androidx.compose.material3.*
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import coil.compose.AsyncImage
+import coil.request.ImageRequest
 import com.tiangong.aiagent.domain.model.Message
 import com.tiangong.aiagent.util.MarkdownRenderer
 import java.text.SimpleDateFormat
@@ -18,7 +22,11 @@ import java.util.Date
 import java.util.Locale
 
 @Composable
-fun MessageBubble(message: Message) {
+fun MessageBubble(
+    message: Message,
+    agentName: String = "助手",
+    agentAvatar: String? = null
+) {
     val isUser = message.role == Message.Role.USER
     val isTool = message.role == Message.Role.TOOL
     val alignment = if (isUser) Alignment.End else Alignment.Start
@@ -42,15 +50,11 @@ fun MessageBubble(message: Message) {
     ) {
         if (!isUser && !isTool) {
             Row(verticalAlignment = Alignment.CenterVertically) {
-                Icon(
-                    imageVector = Icons.Default.SmartToy,
-                    contentDescription = null,
-                    modifier = Modifier.size(16.dp),
-                    tint = MaterialTheme.colorScheme.primary
-                )
+                // Avatar: emoji, image URL, or default icon
+                AgentAvatar(agentAvatar = agentAvatar)
                 Spacer(modifier = Modifier.width(4.dp))
                 Text(
-                    text = "助手",
+                    text = agentName,
                     style = MaterialTheme.typography.labelSmall,
                     color = MaterialTheme.colorScheme.primary,
                     fontWeight = FontWeight.Bold
@@ -111,3 +115,40 @@ private fun formatTimestamp(epochMillis: Long): String {
         }
     }
 }
+
+@Composable
+private fun AgentAvatar(agentAvatar: String?) {
+    when {
+        // Image URL
+        agentAvatar != null && (agentAvatar.startsWith("http") ||
+                agentAvatar.startsWith("/") ||
+                agentAvatar.startsWith("data:")) -> {
+            AsyncImage(
+                model = ImageRequest.Builder(androidx.compose.ui.platform.LocalContext.current)
+                    .data(agentAvatar)
+                    .crossfade(true)
+                    .build(),
+                contentDescription = "头像",
+                modifier = Modifier.size(18.dp),
+                contentScale = ContentScale.Crop
+            )
+        }
+        // Emoji or text avatar
+        agentAvatar != null -> {
+            Text(
+                text = agentAvatar,
+                fontSize = 16.sp,
+                modifier = Modifier.size(18.dp)
+            )
+        }
+        // Default fallback
+        else -> {
+            Icon(
+                imageVector = Icons.Default.SmartToy,
+                contentDescription = null,
+                modifier = Modifier.size(16.dp),
+                tint = MaterialTheme.colorScheme.primary
+            )
+        }
+    }
+}

android/app/src/main/java/com/tiangong/aiagent/ui/settings/SettingsScreen.kt

@@ -52,7 +52,7 @@ class SettingsViewModel @Inject constructor(
         .stateIn(viewModelScope, SharingStarted.Eagerly, false)
 
     val ttsVoice: StateFlow<String> = tokenDataStore.ttsVoice
-        .stateIn(viewModelScope, SharingStarted.Eagerly, "alloy")
+        .stateIn(viewModelScope, SharingStarted.Eagerly, "xiaoxiao")
 
     val themeMode: StateFlow<String> = tokenDataStore.themeMode
         .stateIn(viewModelScope, SharingStarted.Eagerly, "system")
@@ -153,12 +153,21 @@ class SettingsViewModel @Inject constructor(
     }
 
     fun voiceLabel(voice: String): String = when (voice) {
-        "alloy" -> "Alloy (中性)"
-        "echo" -> "Echo (男声)"
-        "fable" -> "Fable (英式)"
-        "onyx" -> "Onyx (深沉)"
-        "nova" -> "Nova (女声)"
-        "shimmer" -> "Shimmer (轻柔)"
+        "xiaoxiao" -> "晓晓 (温柔女声)"
+        "xiaoyi" -> "晓怡 (活泼女声)"
+        "yunxi" -> "云希 (阳光男声)"
+        "yunyang" -> "云扬 (新闻男声)"
+        "yunjian" -> "云健 (成熟男声)"
+        "yunxia" -> "云夏 (可爱女声)"
+        "xiaochen" -> "晓辰 (温婉女声)"
+        "xiaohan" -> "晓涵 (知性女声)"
+        // Backward compat: OpenAI → Edge voice names
+        "alloy" -> "晓晓 (默认)"
+        "echo" -> "云扬 (默认)"
+        "fable" -> "晓晓 (默认)"
+        "onyx" -> "云健 (默认)"
+        "nova" -> "晓怡 (默认)"
+        "shimmer" -> "晓晓 (默认)"
         else -> voice
     }
 }
@@ -492,7 +501,7 @@ fun SettingsScreen(
 
     // Voice selection dialog
     if (showVoiceDialog) {
-        val voices = listOf("alloy", "echo", "fable", "onyx", "nova", "shimmer")
+        val voices = listOf("xiaoxiao", "xiaoyi", "yunxi", "yunyang", "yunjian", "yunxia")
         AlertDialog(
             onDismissRequest = { showVoiceDialog = false },
             title = { Text("选择 TTS 音色") },

android/app/src/main/java/com/tiangong/aiagent/util/AudioRecorder.kt

@@ -19,6 +19,9 @@ class AudioRecorder @Inject constructor(
 
     @Throws(IOException::class)
     fun startRecording(): File {
+        // Guard against double-start which leaks the first MediaRecorder
+        if (mediaRecorder != null) return outputFile!!
+
         outputFile = File(context.cacheDir, "voice_${System.currentTimeMillis()}.aac")
 
         mediaRecorder = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {

android/app/src/main/java/com/tiangong/aiagent/util/MarkdownRenderer.kt

@@ -33,6 +33,7 @@ object MarkdownRenderer {
      * Uses regex to remove common formatting markers:
      * **bold**, *italic*, `code`, ```blocks```, # headings,
      * [links](url), ![images](url), > blockquotes, - lists, | tables.
+     * Also removes emoji and parenthetical content (same as web cleanForTTS).
      */
     fun stripMarkdownForTTS(text: String): String {
         if (text.isBlank()) return ""
@@ -47,18 +48,67 @@ object MarkdownRenderer {
             .replace(Regex("(?m)^>\\s*"), "")                  // blockquote
             .replace(Regex("(?m)^---+$"), "")                  // horizontal rules
             .replace("|", " ")                                 // table pipes
+            .replace(Regex("[（(][^）)]*[）)]"), "")            // parenthetical content
             .replace(Regex("\\n{3,}"), "\n\n")                 // collapse excessive newlines
+            .let { stripEmoji(it) }                            // strip emoji characters
             .trim()
     }
 
+    /**
+     * Remove emoji characters using code-point ranges.
+     * Java/Kotlin regex doesn't support Unicode emoji property escapes,
+     * so we filter by checking each code point against known emoji blocks.
+     */
+    private fun stripEmoji(text: String): String {
+        val sb = StringBuilder(text.length)
+        var i = 0
+        while (i < text.length) {
+            val cp = text.codePointAt(i)
+            val charCount = Character.charCount(cp)
+            if (!isEmoji(cp)) {
+                sb.appendCodePoint(cp)
+            }
+            i += charCount
+        }
+        return sb.toString()
+    }
+
+    private fun isEmoji(cp: Int): Boolean {
+        return cp in 0x1F600..0x1F64F    // Emoticons
+            || cp in 0x1F300..0x1F5FF    // Misc Symbols & Pictographs
+            || cp in 0x1F680..0x1F6FF    // Transport & Map
+            || cp in 0x1F1E0..0x1F1FF    // Flags (regional indicators)
+            || cp in 0x1F900..0x1F9FF    // Supplemental Symbols
+            || cp in 0x1FA00..0x1FA6F    // Chess Symbols
+            || cp in 0x1FA70..0x1FAFF    // Symbols Extended-A
+            || cp in 0x2600..0x27BF      // Misc Symbols + Dingbats
+            || cp in 0x2300..0x23FF      // Misc Technical
+            || cp in 0x2B50..0x2B55      // Star/circle symbols
+            || cp in 0x2702..0x27B0      // Scissors/dingbats
+            || cp in 0x25AA..0x25FE      // Geometric shapes
+            || cp == 0x200D              // Zero-width joiner
+            || cp == 0xFE0F              // Variation selector-16
+            || cp in 0x2934..0x2935      // Curved arrows
+            || cp == 0x3030              // Wavy dash
+            || cp == 0x303D              // Part alternation mark
+            || cp == 0x3297              // Congratulation (CJK)
+            || cp == 0x3299              // Secret (CJK)
+            || cp in 0x1F000..0x1F02F    // Mahjong/Domino tiles
+            || cp in 0x1F0A0..0x1F0FF    // Playing cards
+            || cp in 0x1FA80..0x1FA8F    // Kite, yo-yo etc
+    }
+
+    @Volatile
     private var markwonInstance: Markwon? = null
 
     private fun getMarkwon(context: Context): Markwon {
-        return markwonInstance ?: Markwon.builder(context)
-            .usePlugin(CoilImagesPlugin.create(context))
-            .usePlugin(LinkifyPlugin.create())
-            .build()
-            .also { markwonInstance = it }
+        return markwonInstance ?: synchronized(this) {
+            markwonInstance ?: Markwon.builder(context)
+                .usePlugin(CoilImagesPlugin.create(context))
+                .usePlugin(LinkifyPlugin.create())
+                .build()
+                .also { markwonInstance = it }
+        }
     }
 
     /**
@@ -310,7 +360,7 @@ object MarkdownRenderer {
                             withStyle(
                                 SpanStyle(
                                     fontFamily = FontFamily.Monospace,
-                                    background = androidx.compose.ui.graphics.Color(0x20000000)
+                                    background = MaterialTheme.colorScheme.surfaceVariant
                                 )
                             ) {
                                 append(text.substring(i + 1, end))