Merge remote-tracking branch 'origin/opti4' into opti6

1. 将 ChatViewModel 中 AI 的流式刷新频率 (STREAM_FLUSH_INTERVAL_MS) 从 50ms 调整为 150ms，以降低低端机中高频触发文本重绘(Text Layout)的沉重 CPU 负担，肉眼仍旧保持平滑。
2. 将 SharedPreferences 持久化全量对话记录（saveCacheToLocal）的操作，利用协程移动至 Dispatchers.IO 线程中，防止读写巨大 JSON 字符串时彻底堵死主线程引发应用 ANR 或冻结。

app/src/main/java/com/stand/standapp/ui/chat/ChatViewModel.kt

@@ -21,7 +21,7 @@ import org.json.JSONArray
 import org.json.JSONObject
 import java.util.UUID
 
-private const val STREAM_FLUSH_INTERVAL_MS = 50L
+private const val STREAM_FLUSH_INTERVAL_MS = 150L
 
 class ChatViewModel(application: Application) : AndroidViewModel(application) {
     private val repository = AiChatRepository()
@@ -139,34 +139,37 @@ class ChatViewModel(application: Application) : AndroidViewModel(application) {
     }
 
     private fun saveCacheToLocal() {
-        try {
-            // 保存会话列表
-            val sessionsArray = JSONArray()
-            _sessions.value.forEach { session ->
-                val obj = JSONObject()
-                obj.put("id", session.id)
-                obj.put("title", session.title)
-                obj.put("timestamp", session.timestamp)
-                sessionsArray.put(obj)
-            }
+        // 将数据保存放到IO线程中，防止SharedPreferences写大文本阻塞主线程卡顿
+        viewModelScope.launch(kotlinx.coroutines.Dispatchers.IO) {
+            try {
+                // 保存会话列表
+                val sessionsArray = JSONArray()
+                _sessions.value.forEach { session ->
+                    val obj = JSONObject()
+                    obj.put("id", session.id)
+                    obj.put("title", session.title)
+                    obj.put("timestamp", session.timestamp)
+                    sessionsArray.put(obj)
+                }
 
-            // 保存消息列表
-            val messagesArray = JSONArray()
-            _messages.value.forEach { msg ->
-                val obj = JSONObject()
-                obj.put("id", msg.id)
-                obj.put("sessionId", msg.sessionId)
-                obj.put("role", msg.role.name)
-                obj.put("content", msg.content)
-                messagesArray.put(obj)
-            }
+                // 保存消息列表
+                val messagesArray = JSONArray()
+                _messages.value.forEach { msg ->
+                    val obj = JSONObject()
+                    obj.put("id", msg.id)
+                    obj.put("sessionId", msg.sessionId)
+                    obj.put("role", msg.role.name)
+                    obj.put("content", msg.content)
+                    messagesArray.put(obj)
+                }
 
-            prefs.edit()
-                .putString("cache_sessions", sessionsArray.toString())
-                .putString("cache_messages", messagesArray.toString())
-                .apply()
-        } catch (e: Exception) {
-            e.printStackTrace()
+                prefs.edit()
+                    .putString("cache_sessions", sessionsArray.toString())
+                    .putString("cache_messages", messagesArray.toString())
+                    .apply()
+            } catch (e: Exception) {
+                e.printStackTrace()
+            }
         }
     }
 

app/src/main/java/com/stand/standapp/ui/chat/FloatingChatWidget.kt

@@ -94,25 +94,19 @@ fun FloatingChatWidget() {
                 visible = true
             }
 
-            // 👈 用 FAB 位置计算对话框位置，但强制钳制在屏幕内
-            // FAB右下角为基准：对话框应该出现在 FAB 附近
-            val fabRight = screenWidthPx - paddingPx * 2 + fabOffsetX  // FAB右边缘
-            val fabBottom = screenHeightPx - paddingPx * 2 - navBarPx + fabOffsetY  // FAB下边缘
-
-            // 对话框优先放在 FAB 左上方，如果放不下就贴边
-            val rawX = fabRight - cardWidthPx - paddingPx  // FAB左边
-            val rawY = fabBottom - cardHeightPx - paddingPx  // FAB上边
-
-            // 👈 关键：钳制到屏幕内
-            val clampedX = rawX.coerceIn(0f, screenWidthPx - cardWidthPx)
-            val clampedY = rawY.coerceIn(0f, screenHeightPx - cardHeightPx)
-
             AnimatedVisibility(
                 visible = visible,
                 enter = fadeIn(animationSpec = tween(300)) + scaleIn(initialScale = 0.8f, animationSpec = tween(300)),
                 exit = fadeOut(animationSpec = tween(200)) + scaleOut(targetScale = 0.8f, animationSpec = tween(200)),
                 modifier = Modifier
                     .offset {
+                        val fabRight = screenWidthPx - paddingPx * 2 + fabOffsetX
+                        val fabBottom = screenHeightPx - paddingPx * 2 - navBarPx + fabOffsetY
+                        val rawX = fabRight - cardWidthPx - paddingPx
+                        val rawY = fabBottom - cardHeightPx - paddingPx
+                        val clampedX = rawX.coerceIn(0f, screenWidthPx - cardWidthPx)
+                        val clampedY = rawY.coerceIn(0f, screenHeightPx - cardHeightPx)
+                        
                         IntOffset(
                             (clampedX + cardDragX).roundToInt()
                                 .coerceIn(0, (screenWidthPx - cardWidthPx).toInt()),

app/src/main/java/com/stand/standapp/ui/chat/components/ChatArea.kt

@@ -40,6 +40,18 @@ fun ChatArea(
         }
     }
 
+    val context = androidx.compose.ui.platform.LocalContext.current
+    val markwon = remember(context) {
+        io.noties.markwon.Markwon.builder(context)
+            .usePlugin(io.noties.markwon.core.CorePlugin.create())
+            .usePlugin(io.noties.markwon.ext.tables.TablePlugin.create(context))
+            .usePlugin(io.noties.markwon.html.HtmlPlugin.create())
+            .usePlugin(io.noties.markwon.linkify.LinkifyPlugin.create())
+            .usePlugin(io.noties.markwon.ext.strikethrough.StrikethroughPlugin.create())
+            .usePlugin(io.noties.markwon.ext.tasklist.TaskListPlugin.create(context))
+            .build()
+    }
+    
     val isAnyStreaming = remember(messages) { messages.any { it.isStreaming } }
     if (isAnyStreaming) {
         val totalLength = messages.map { it.content.length }.sum()
@@ -111,6 +123,7 @@ fun ChatArea(
                             val contentWithCursor = msg.content + if (msg.isStreaming) " █" else ""
                             MarkwonRenderer(
                                 markdown = contentWithCursor,
+                                markwon = markwon,
                                 modifier = Modifier.padding(12.dp)
                             )
                         }
@@ -161,19 +174,7 @@ fun ChatArea(
 }
 
 @Composable
-fun MarkwonRenderer(markdown: String, modifier: Modifier) {
-    val context = androidx.compose.ui.platform.LocalContext.current
-    val markwon = remember(context) {
-        io.noties.markwon.Markwon.builder(context)
-            .usePlugin(io.noties.markwon.core.CorePlugin.create())
-            .usePlugin(io.noties.markwon.ext.tables.TablePlugin.create(context))
-            .usePlugin(io.noties.markwon.html.HtmlPlugin.create())
-            .usePlugin(io.noties.markwon.linkify.LinkifyPlugin.create())
-            .usePlugin(io.noties.markwon.ext.strikethrough.StrikethroughPlugin.create())
-            .usePlugin(io.noties.markwon.ext.tasklist.TaskListPlugin.create(context))
-            .build()
-    }
-
+fun MarkwonRenderer(markdown: String, markwon: io.noties.markwon.Markwon, modifier: Modifier) {
     androidx.compose.ui.viewinterop.AndroidView(
         factory = { ctx ->
             val textView = SafeSelectableTextView(ctx).apply {

app/src/main/java/com/stand/standapp/utils/LogManager.kt

@@ -187,6 +187,9 @@ object LogManager {
         private val fileNameFormat = SimpleDateFormat("yyyy-MM-dd", Locale.getDefault())
 
         override fun log(priority: Int, tag: String?, message: String, t: Throwable?) {
+            // 过滤掉高频的 VERBOSE 级别日志写入（例如录音帧），保留在控制台输出
+            if (priority == android.util.Log.VERBOSE) return
+            
             executor.execute {
                 try {
                     val logFile = File(logDir, "${fileNameFormat.format(Date())}.log")