调整成30分钟一次时间分割显示；最新的信息不显示时间

app/src/main/java/com/aiosman/riderpro/ui/chat/ChatScreen.kt

@@ -3,6 +3,7 @@ package com.aiosman.riderpro.ui.chat
 import android.app.Activity
 import android.content.Intent
 import android.net.Uri
+import android.util.Log
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.animation.Crossfade
@@ -509,14 +510,14 @@ fun ChatInput(
 fun groupMessagesByTime(chatList: List<ChatItem>, viewModel: ChatViewModel): List<ChatItem> {
     for (i in chatList.indices) { // Iterate in normal order
         if (i == 0) {
-            viewModel.showTimestampMap[chatList[i].msgId] = true
-            chatList[i].showTimeDivider = true
+            viewModel.showTimestampMap[chatList[i].msgId] = false
+            chatList[i].showTimeDivider = false
             continue
         }
         val currentMessage = chatList[i]
         val timeDiff = currentMessage.timestamp - chatList[i - 1].timestamp
         // 时间间隔大于 3 分钟，显示时间戳
-        if (-timeDiff > 3 * 60 * 1000) {
+        if (-timeDiff > 30 * 60 * 1000) {
             viewModel.showTimestampMap[currentMessage.msgId] = true
             currentMessage.showTimeDivider = true
         }