feat: animate pinned and composer state transitions

feat: add smooth pinned-message visibility changes and voice composer mode transitions

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

@@ -82,6 +82,8 @@ import androidx.compose.runtime.derivedStateOf
 import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
+import androidx.compose.animation.slideInVertically
+import androidx.compose.animation.slideOutVertically
 import androidx.compose.animation.scaleIn
 import androidx.compose.animation.scaleOut
 import androidx.compose.animation.core.LinearEasing
@@ -1069,7 +1071,18 @@ private fun ChatScreen(
             )
         }
         val pinnedMessage = state.pinnedMessage
-        if (pinnedMessage != null && dismissedPinnedMessageId != pinnedMessage.id) {
+        AnimatedVisibility(
+            visible = pinnedMessage != null && dismissedPinnedMessageId != pinnedMessage?.id,
+            enter = fadeIn(animationSpec = tween(180)) + slideInVertically(
+                initialOffsetY = { -it / 3 },
+                animationSpec = tween(180),
+            ),
+            exit = fadeOut(animationSpec = tween(120)) + slideOutVertically(
+                targetOffsetY = { -it / 3 },
+                animationSpec = tween(120),
+            ),
+        ) {
+            val resolvedPinnedMessage = pinnedMessage ?: return@AnimatedVisibility
             Row(
                 modifier = Modifier
                     .fillMaxWidth()
@@ -1092,12 +1105,12 @@ private fun ChatScreen(
                         fontWeight = FontWeight.SemiBold,
                     )
                     Text(
-                        text = pinnedMessage.text?.takeIf { it.isNotBlank() } ?: "[${pinnedMessage.type}]",
+                        text = resolvedPinnedMessage.text?.takeIf { it.isNotBlank() } ?: "[${resolvedPinnedMessage.type}]",
                         style = MaterialTheme.typography.labelMedium,
                         maxLines = 2,
                     )
                 }
-                IconButton(onClick = { dismissedPinnedMessageId = pinnedMessage.id }) {
+                IconButton(onClick = { dismissedPinnedMessageId = resolvedPinnedMessage.id }) {
                     Icon(imageVector = Icons.Filled.Close, contentDescription = "Hide pinned")
                 }
             }
@@ -1825,7 +1838,17 @@ private fun ChatScreen(
                         .padding(horizontal = 8.dp, vertical = 6.dp),
                     verticalArrangement = Arrangement.spacedBy(6.dp),
                 ) {
-                    if (state.isRecordingVoice) {
+                    AnimatedVisibility(
+                        visible = state.isRecordingVoice,
+                        enter = fadeIn(animationSpec = tween(150)) + slideInVertically(
+                            initialOffsetY = { it / 3 },
+                            animationSpec = tween(150),
+                        ),
+                        exit = fadeOut(animationSpec = tween(100)) + slideOutVertically(
+                            targetOffsetY = { it / 3 },
+                            animationSpec = tween(100),
+                        ),
+                    ) {
                         VoiceRecordingStatusRow(
                             durationMs = state.voiceRecordingDurationMs,
                             hint = state.voiceRecordingHint,
@@ -1833,7 +1856,18 @@ private fun ChatScreen(
                             onCancel = onVoiceRecordCancel,
                             onSend = onVoiceRecordSend,
                         )
-                    } else {
+                    }
+                    AnimatedVisibility(
+                        visible = !state.isRecordingVoice,
+                        enter = fadeIn(animationSpec = tween(150)) + slideInVertically(
+                            initialOffsetY = { it / 3 },
+                            animationSpec = tween(150),
+                        ),
+                        exit = fadeOut(animationSpec = tween(100)) + slideOutVertically(
+                            targetOffsetY = { it / 3 },
+                            animationSpec = tween(100),
+                        ),
+                    ) {
                         Row(
                             modifier = Modifier
                                 .fillMaxWidth()