Fix desktop hover and emoji playback; share Android chat background

tools/chatgui-android/app/src/main/java/com/utun/chat/ui/components/ConversationMessages.kt

@@ -3,9 +3,21 @@ package com.utun.chat.ui.components
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.lazy.*
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.drawWithCache
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.geometry.Size
+import androidx.compose.ui.graphics.ImageBitmap
+import androidx.compose.ui.graphics.ImageShader
+import androidx.compose.ui.graphics.ShaderBrush
+import androidx.compose.ui.graphics.TileMode
+import androidx.compose.ui.graphics.drawscope.scale
+import androidx.compose.ui.res.imageResource
 import androidx.compose.ui.unit.dp
+import com.utun.chat.R
 import com.utun.chat.data.ConversationTarget
+import com.utun.chat.data.LogManager
 import com.utun.chat.data.Message
 import com.utun.chat.viewmodel.ChatViewModel
 
@@ -16,7 +28,20 @@ fun ConversationMessages(target: ConversationTarget, messages: List<Message>, st
                          onPlayVoice: (String, Int) -> Unit, onSeekVoice: (String, Int, Int) -> Unit,
                          onOpenFile: (Message) -> Unit, onPlayVideo: (Message) -> Unit,
                          onDownloadFile: (Message) -> Unit = {}, onOpenImage: (Message) -> Unit = {}) {
-    LazyColumn(modifier = modifier, state = state, reverseLayout = true) {
+    val background = ImageBitmap.imageResource(R.drawable.chat_background)
+    LaunchedEffect(background) {
+        LogManager.addLog("DEBUG", "UI", "Chat background ready: desktop bg.png tile=${background.width}x${background.height}")
+    }
+    // Плитка закреплена за областью списка; плотность экрана сохраняет размер узора в dp.
+    val backgroundModifier = Modifier.drawWithCache {
+        val brush = ShaderBrush(ImageShader(background, TileMode.Repeated, TileMode.Repeated))
+        onDrawBehind {
+            scale(density, density, pivot = Offset.Zero) {
+                drawRect(brush, size = Size(size.width / density, size.height / density))
+            }
+        }
+    }
+    LazyColumn(modifier = modifier.then(backgroundModifier), state = state, reverseLayout = true) {
         item { Spacer(Modifier.height(8.dp)) }
         items(messages.reversed(), key = { "${target.nativeId}:${it.isOutgoing}:${it.id}" }) { message ->
             MessageBubble(message, playbackState, onPlayVoice, onSeekVoice, onDownloadFile, onOpenFile, onOpenImage, onPlayVideo)