Drop redundant outer padding around composer input row

The Row's padding(vertical = spacing2xs) added 8 dp to the composer
surface with no Figma backing; the inner padding already provides the
spec spacing. Also remove a wrapContentHeight() from the
MessageComposer call in ChannelScreen — Column already grants
intrinsic vertical sizing to its children, so the modifier had no
effect.

Re-record MessageComposerTest snapshots.

Author: andremion

stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/messages/ChannelScreen.kt

@@ -31,7 +31,6 @@ import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.ime
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.safeDrawingPadding
-import androidx.compose.foundation.layout.wrapContentHeight
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.SnackbarDuration
@@ -367,9 +366,7 @@ internal fun DefaultBottomBarContent(
 
     Column {
         MessageComposer(
-            modifier = Modifier
-                .fillMaxWidth()
-                .wrapContentHeight(),
+            modifier = Modifier.fillMaxWidth(),
             viewModel = composerViewModel,
             isAttachmentPickerVisible = attachmentsPickerViewModel.isPickerVisible,
             onAttachmentsClick = attachmentsPickerViewModel::togglePickerVisibility,

stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/messages/composer/MessageComposer.kt

@@ -60,6 +60,7 @@ import io.getstream.chat.android.compose.ui.theme.MessageComposerParams
 import io.getstream.chat.android.compose.ui.theme.MessageComposerTrailingContentParams
 import io.getstream.chat.android.compose.ui.theme.StreamTokens
 import io.getstream.chat.android.compose.ui.util.SnackbarPopup
+import io.getstream.chat.android.compose.ui.util.StreamSnackbar
 import io.getstream.chat.android.compose.ui.util.StreamSnackbarVariant
 import io.getstream.chat.android.compose.ui.util.StreamSnackbarVisuals
 import io.getstream.chat.android.compose.util.extensions.toSet
@@ -299,7 +300,6 @@ public fun MessageComposer(
 
         Row(
             modifier = Modifier
-                .padding(vertical = StreamTokens.spacing2xs)
                 .fillMaxWidth()
                 .padding(
                     start = StreamTokens.spacingMd,