fix(android): make chat day separator keys unique

android/app/src/main/java/ru/daemonlord/messenger/ui/chat/ChatScreen.kt

@@ -675,7 +675,7 @@ fun ChatScreen(
                         items = timelineItems,
                         key = { item ->
                             when (item) {
-                                is ChatTimelineItem.DayHeader -> "day:${item.dateKey}"
+                                is ChatTimelineItem.DayHeader -> "day:${item.headerId}"
                                 is ChatTimelineItem.MessageEntry -> "msg:${item.message.id}"
                             }
                         },
@@ -2047,6 +2047,7 @@ private fun FileAttachmentRow(
 
 private sealed interface ChatTimelineItem {
     data class DayHeader(
+        val headerId: String,
         val dateKey: String,
         val label: String,
     ) : ChatTimelineItem
@@ -2090,10 +2091,13 @@ private fun buildChatTimelineItems(messages: List<MessageItem>): List<ChatTimeli
     if (messages.isEmpty()) return emptyList()
     val items = mutableListOf<ChatTimelineItem>()
     var previousDate: LocalDate? = null
+    var dayHeaderCounter = 0
     messages.forEach { message ->
         val date = parseMessageLocalDate(message.createdAt)
         if (date != null && date != previousDate) {
+            dayHeaderCounter += 1
             items += ChatTimelineItem.DayHeader(
+                headerId = "${date}_$dayHeaderCounter",
                 dateKey = date.toString(),
                 label = formatDateSeparatorLabel(date),
             )