Keep Android video metadata truthful and remove obsolete composer imports

tools/chatgui-android/app/src/main/java/com/utun/chat/ui/screens/ChatScreen.kt

@@ -1,9 +1,6 @@
 package com.utun.chat.ui.screens
 
-import android.content.ContentResolver
-import android.net.Uri
 import android.os.SystemClock
-import android.provider.OpenableColumns
 import android.view.ViewConfiguration
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
@@ -13,8 +10,6 @@ import androidx.compose.foundation.clickable
 import androidx.compose.foundation.gestures.awaitFirstDown
 import androidx.compose.foundation.horizontalScroll
 import androidx.compose.foundation.layout.*
-import androidx.compose.foundation.lazy.LazyColumn
-import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.CircleShape
@@ -48,22 +43,17 @@ import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import com.utun.chat.ChatApplication
-import com.utun.chat.data.LogManager
 import com.utun.chat.data.AudioRoute
 import com.utun.chat.data.Channel
 import com.utun.chat.data.Message
-import com.utun.chat.data.NativeLib
 import com.utun.chat.data.RadioAudioEngine
 import com.utun.chat.data.RadioOverlayService
-import com.utun.chat.ui.components.InputBar
 import com.utun.chat.ui.components.ConversationMessages
 import com.utun.chat.ui.components.ConversationComposer
 import com.utun.chat.data.ConversationTarget
 import com.utun.chat.viewmodel.ChatViewModel
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable

tools/chatgui-android/app/src/main/java/com/utun/chat/viewmodel/ChatViewModel.kt

@@ -1072,6 +1072,8 @@ class ChatViewModel : ViewModel() {
                     val mmr = MediaMetadataRetriever()
                     try {
                         mmr.setDataSource(filePath)
+                        if (mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_MIMETYPE) != "video/mp4")
+                            throw IllegalStateException("На Android отправка как видео поддерживает MP4; другой формат отправьте как файл")
                         Triple(
                             mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION)?.toIntOrNull() ?: 0,
                             mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH)?.toIntOrNull() ?: 0,
@@ -1211,6 +1213,7 @@ class ChatViewModel : ViewModel() {
     }
 
     fun clearState() {
+        _attachmentPreparations.value = emptyMap()
         repo?.close()
         repo = null
         dbReady = false