feat(chat): 接入 <p> 多气泡与 <action>/<narration> 旁白渲染

chat 模式消息按 <p> 拆成多个气泡；<action>/<narration> 解析为灰斜体小字依附气泡上/下；来源角标只在最后一条气泡显示一次。非 chat 模式原样渲染。

app/src/main/kotlin/top/yeij/cyrene/ui/chat/ChatScreen.kt

@@ -3,16 +3,13 @@ package top.yeij.cyrene.ui.chat
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Arrangement
 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.widthIn
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.lazy.rememberLazyListState
-import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
@@ -26,7 +23,6 @@ import androidx.lifecycle.viewmodel.initializer
 import androidx.lifecycle.viewmodel.viewModelFactory
 import kotlinx.coroutines.flow.distinctUntilChanged
 import top.yeij.cyrene.app.AppContainer
-import top.yeij.cyrene.data.api.dto.HistoryMessageDto
 import top.yeij.cyrene.data.ws.WsState
 import top.yukonga.miuix.kmp.basic.Icon
 import top.yukonga.miuix.kmp.basic.IconButton
@@ -130,41 +126,6 @@ fun ChatScreen(
     }
 }
 
-@Composable
-private fun MessageBubble(message: HistoryMessageDto) {
-    val isUser = message.role == "user"
-    val bubbleColor = if (isUser) MiuixTheme.colorScheme.primary else MiuixTheme.colorScheme.surfaceContainer
-    val textColor = if (isUser) MiuixTheme.colorScheme.onPrimary else MiuixTheme.colorScheme.onSurfaceContainer
-
-    Column(
-        modifier = Modifier
-            .fillMaxWidth()
-            .padding(horizontal = 14.dp),
-        horizontalAlignment = if (isUser) Alignment.End else Alignment.Start,
-    ) {
-        Box(
-            modifier = Modifier
-                .widthIn(max = 300.dp)
-                .background(color = bubbleColor, shape = RoundedCornerShape(18.dp))
-                .padding(horizontal = 14.dp, vertical = 10.dp),
-        ) {
-            Text(
-                text = message.content,
-                style = MiuixTheme.textStyles.main,
-                color = textColor,
-            )
-        }
-        messageSourceLabel(message)?.let { source ->
-            Text(
-                text = source,
-                style = MiuixTheme.textStyles.footnote2,
-                color = MiuixTheme.colorScheme.onSurfaceVariantSummary,
-                modifier = Modifier.padding(top = 3.dp, start = 6.dp, end = 6.dp),
-            )
-        }
-    }
-}
-
 @Composable
 private fun CenterHint(text: String) {
     Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {

app/src/main/kotlin/top/yeij/cyrene/ui/chat/MessageBubble.kt

@@ -0,0 +1,107 @@
+package top.yeij.cyrene.ui.chat
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.widthIn
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.font.FontStyle
+import androidx.compose.ui.unit.dp
+import top.yeij.cyrene.data.api.dto.HistoryMessageDto
+import top.yeij.cyrene.domain.parse.ContentPart
+import top.yeij.cyrene.domain.parse.ParsedBubble
+import top.yeij.cyrene.domain.parse.parse
+import top.yukonga.miuix.kmp.basic.Text
+import top.yukonga.miuix.kmp.theme.MiuixTheme
+
+/**
+ * 一条消息渲染成一个或多个气泡：
+ * - `mode` 为 `chat`（或缺失——后端当前不落库 mode，一律回落 chat）时按 `<p>` 切分，
+ *   `<action>` / `<narration>` 解析成灰斜体小字，依附到所属气泡的上方/下方；
+ * - 其它 mode 原样整条渲染，不解析标签。
+ */
+@Composable
+fun MessageBubble(message: HistoryMessageDto) {
+    val isUser = message.role == "user"
+    val isChat = message.mode.isNullOrBlank() || message.mode == "chat"
+
+    val bubbles = remember(message.content, isChat) {
+        val parsed = if (isChat) parse(message.content).filterNot { it.isEmpty } else emptyList()
+        parsed.ifEmpty {
+            listOf(
+                ParsedBubble(
+                    body = message.content,
+                    parts = emptyList(),
+                    head = emptyList(),
+                    tail = emptyList(),
+                ),
+            )
+        }
+    }
+    val source = messageSourceLabel(message)
+
+    Column(
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(horizontal = 14.dp),
+        horizontalAlignment = if (isUser) Alignment.End else Alignment.Start,
+    ) {
+        bubbles.forEachIndexed { index, bubble ->
+            AnnotationLine(bubble.head)
+            if (bubble.body.isNotEmpty()) BubbleBody(bubble.body, isUser)
+            AnnotationLine(bubble.tail)
+            // 来源角标只在最后一条气泡下方显示一次，避免多气泡消息重复刷屏
+            if (index == bubbles.lastIndex && source != null) {
+                Text(
+                    text = source,
+                    style = MiuixTheme.textStyles.footnote2,
+                    color = MiuixTheme.colorScheme.onSurfaceVariantSummary,
+                    modifier = Modifier.padding(top = 3.dp, start = 6.dp, end = 6.dp),
+                )
+            }
+        }
+    }
+}
+
+/** 旁白/动作：灰斜体小字，依附在气泡上/下。 */
+@Composable
+private fun AnnotationLine(parts: List<ContentPart>) {
+    val text = parts.joinToString(" ") { it.text }.trim()
+    if (text.isEmpty()) return
+    Text(
+        text = text,
+        style = MiuixTheme.textStyles.footnote1,
+        fontStyle = FontStyle.Italic,
+        color = MiuixTheme.colorScheme.onSurfaceVariantSummary,
+        modifier = Modifier.padding(horizontal = 8.dp, vertical = 2.dp),
+    )
+}
+
+@Composable
+private fun BubbleBody(text: String, isUser: Boolean) {
+    Box(
+        modifier = Modifier
+            .widthIn(max = 300.dp)
+            .background(
+                color = if (isUser) {
+                    MiuixTheme.colorScheme.primary
+                } else {
+                    MiuixTheme.colorScheme.surfaceContainer
+                },
+                shape = RoundedCornerShape(18.dp),
+            )
+            .padding(horizontal = 14.dp, vertical = 10.dp),
+    ) {
+        Text(
+            text = text,
+            style = MiuixTheme.textStyles.main,
+            color = if (isUser) MiuixTheme.colorScheme.onPrimary else MiuixTheme.colorScheme.onSurfaceContainer,
+        )
+    }
+}