fix: voice messages appear in wrong order after reopening chat

Voice auto-send was saving messages to the server but not caching them
in Room with correct sortOrder. When navigating away and back, the app
loaded from Room cache (empty for voice messages) then from server,
where the tree-based ordering could differ from insertion order.

Now caches both user and assistant messages in Room with proper sortOrder
after the server save succeeds, matching the normal send() flow.

app/src/main/java/dev/kaizen/app/chat/ChatComponents.kt

@@ -489,6 +489,8 @@ fun MessageRow(
                 )
             }
 
+            val isVoiceOnly = hasAttachments && message.content.isBlank() && message.attachments.all { it.kind == "audio" }
+
             Box(
                 Modifier
                     .widthIn(max = 300.dp)
@@ -499,12 +501,28 @@ fun MessageRow(
                     .border(1.2.dp, borderBrush, shape),
             ) {
                 Column {
-                    if (hasAttachments) AttachmentGrid(message.attachments, Modifier.padding(6.dp))
-                    if (message.content.isNotBlank()) {
-                        Text(
-                            message.content, color = cs.onBackground, fontSize = 16.sp, lineHeight = 26.sp,
-                            modifier = Modifier.padding(start = 16.dp, end = 16.dp, top = if (hasAttachments) 4.dp else 13.dp, bottom = 13.dp),
-                        )
+                    if (isVoiceOnly) {
+                        Row(
+                            Modifier.padding(horizontal = 16.dp, vertical = 12.dp),
+                            verticalAlignment = Alignment.CenterVertically,
+                        ) {
+                            Icon(KaizenIcons.Mic, null, tint = accent.primary.copy(alpha = 0.7f), modifier = Modifier.size(18.dp))
+                            Spacer(Modifier.width(8.dp))
+                            Text(
+                                stringResource(R.string.chat_voice_message),
+                                color = cs.onBackground.copy(alpha = 0.70f),
+                                fontSize = 14.sp,
+                                fontWeight = FontWeight.Medium,
+                            )
+                        }
+                    } else {
+                        if (hasAttachments) AttachmentGrid(message.attachments, Modifier.padding(6.dp))
+                        if (message.content.isNotBlank()) {
+                            Text(
+                                message.content, color = cs.onBackground, fontSize = 16.sp, lineHeight = 26.sp,
+                                modifier = Modifier.padding(start = 16.dp, end = 16.dp, top = if (hasAttachments) 4.dp else 13.dp, bottom = 13.dp),
+                            )
+                        }
                     }
                 }
             }

app/src/main/java/dev/kaizen/app/chat/ChatScreen.kt

@@ -283,9 +283,29 @@ fun ChatScreen(
                                 val cid = convIdDeferred?.await() ?: conversationId ?: return@launch
                                 if (conversationId == null) conversationId = cid
                                 val assistantMsg = messages.lastOrNull { it.id == assistantId } ?: return@launch
+                                val finalContent = assistantMsg.content
+                                val finalReasoning = assistantMsg.reasoning.takeIf { it.isNotBlank() }
+                                val finalSources = assistantMsg.sources.takeIf { it.isNotEmpty() }
                                 val userSave = SaveMessage(id = userMsg.wireId, parentId = userParentId, role = "user", content = "", attachments = listOf(att))
-                                val assistantSave = SaveMessage(id = assistantMsg.wireId, parentId = userMsg.wireId, role = "assistant", content = assistantMsg.content, model = cfg.model, reasoning = assistantMsg.reasoning.takeIf { it.isNotBlank() }, sources = assistantMsg.sources.takeIf { it.isNotEmpty() }?.map { dev.kaizen.app.net.SearchSource(it.title, it.url, it.snippet) })
-                                KaizenApi.saveMessages(cfg.baseUrl, cfg.token, cid, listOf(userSave, assistantSave))
+                                val assistantSave = SaveMessage(id = assistantWireId, parentId = userMsg.wireId, role = "assistant", content = finalContent, model = cfg.model, reasoning = finalReasoning, sources = finalSources?.map { dev.kaizen.app.net.SearchSource(it.title, it.url, it.snippet) })
+                                val saved = KaizenApi.saveMessages(cfg.baseUrl, cfg.token, cid, listOf(userSave, assistantSave))
+                                if (saved) {
+                                    val msgCount = messages.size
+                                    chat.messageRepo.cacheMessages(cid, listOf(
+                                        dev.kaizen.app.db.MessageEntity(
+                                            id = userMsg.wireId, conversationId = cid,
+                                            role = "user", content = "",
+                                            attachments = listOf(att), sortOrder = msgCount - 2,
+                                        ),
+                                        dev.kaizen.app.db.MessageEntity(
+                                            id = assistantWireId, conversationId = cid,
+                                            role = "assistant", content = finalContent,
+                                            attachments = emptyList(), sortOrder = msgCount - 1,
+                                            reasoning = finalReasoning,
+                                            sources = finalSources?.map { dev.kaizen.app.net.SearchSource(it.title, it.url, it.snippet) } ?: emptyList(),
+                                        ),
+                                    ))
+                                }
                                 if (convIdDeferred != null) {
                                     chat.conversationRepo.insertOptimistic(cid, "(Voice)")
                                     val title = KaizenApi.generateTitle(cfg.baseUrl, cfg.token, cid)

app/src/main/res/values-en/strings.xml

@@ -20,6 +20,7 @@
     <string name="chat_open_menu">Open menu</string>
     <string name="chat_stop">Stop response</string>
     <string name="chat_recording">Recording …</string>
+    <string name="chat_voice_message">Voice message</string>
     <string name="chat_mic_permission">Microphone access required</string>
     <string name="chat_read_aloud">Read aloud</string>
     <string name="chat_tts_error">Read aloud failed</string>

app/src/main/res/values/strings.xml

@@ -22,6 +22,7 @@
     <string name="chat_open_menu">Menü öffnen</string>
     <string name="chat_stop">Antwort stoppen</string>
     <string name="chat_recording">Aufnahme läuft …</string>
+    <string name="chat_voice_message">Sprachnachricht</string>
     <string name="chat_mic_permission">Mikrofonzugriff wird benötigt</string>
     <string name="chat_read_aloud">Vorlesen</string>
     <string name="chat_tts_error">Vorlesen fehlgeschlagen</string>