feat: new launcher icon + motion polish (adjacent-tab glide, animateItem rows, header crossfade, cheaper pressDip)

app/src/main/java/com/rada/ui/library/LibraryScreen.kt

@@ -1,5 +1,6 @@
 package com.rada.ui.library
 
+import androidx.compose.animation.Crossfade
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.foundation.background
@@ -284,14 +285,18 @@ fun LibraryScreen(
                     .padding(horizontal = 16.dp)
                     .padding(top = 4.dp, bottom = 2.dp),
             ) {
-                Text(
-                    text = headerTitle,
-                    style = MaterialTheme.typography.headlineSmall,
-                    fontWeight = FontWeight.Bold,
-                    color = LocalTokens.current.text,
-                    maxLines = 1,
-                    overflow = TextOverflow.Ellipsis,
-                )
+                // Crossfade the header when the selected folder changes — a
+                // hard text swap reads as a glitch when tabs are tapped.
+                Crossfade(targetState = headerTitle, label = "libraryHeader") { t ->
+                    Text(
+                        text = t,
+                        style = MaterialTheme.typography.headlineSmall,
+                        fontWeight = FontWeight.Bold,
+                        color = LocalTokens.current.text,
+                        maxLines = 1,
+                        overflow = TextOverflow.Ellipsis,
+                    )
+                }
                 Text(
                     text = "${uiState.songs.size} songs",
                     style = MaterialTheme.typography.bodySmall,
@@ -477,8 +482,12 @@ fun LibraryScreen(
                     modifier = Modifier.fillMaxSize(),
                 ) {
                     items(uiState.songs, key = { it.id }) { song ->
+                        // Keyed rows animate in/out when the folder tab or
+                        // search filter changes instead of popping.
+                        val rowMod = if (LocalReduceMotion.current) Modifier else Modifier.animateItem()
                         SongListItem(
                             song = song,
+                            modifier = rowMod,
                             isPlaying = song.id == uiState.currentPlayingId,
                             onClick = { viewModel.playSong(song) },
                             onToggleFavorite = { viewModel.toggleFavorite(song.id) },
@@ -768,10 +777,11 @@ private fun SongListItem(
     onToggleFavorite: () -> Unit,
     onAddToPlaylist: () -> Unit,
     onDelete: () -> Unit,
+    modifier: Modifier = Modifier,
 ) {
     val interaction = remember { MutableInteractionSource() }
     Row(
-        modifier = Modifier
+        modifier = modifier
             .fillMaxWidth()
             .pressDip(interaction, LocalReduceMotion.current)
             .clickable(interactionSource = interaction, indication = androidx.compose.foundation.LocalIndication.current, onClick = onClick)

app/src/main/java/com/rada/ui/navigation/TabsScreen.kt

@@ -30,6 +30,7 @@ import com.rada.ui.player.NowPlayingBar
 import com.rada.ui.playlists.PlaylistManagerScreen
 import com.rada.ui.stations.StationBrowserScreen
 import com.rada.ui.streams.StreamsScreen
+import com.rada.ui.theme.LocalReduceMotion
 import com.rada.ui.theme.LocalTokens
 import kotlinx.coroutines.launch
 
@@ -49,14 +50,26 @@ fun TabsScreen(
 ) {
     val pagerState = rememberPagerState(initialPage = initialIndex.coerceIn(0, 4)) { 5 }
     val scope = rememberCoroutineScope()
+    val reduceMotion = LocalReduceMotion.current
     // Deep-link target for Library (playlist picker → open that playlist).
     var libraryPlaylistId by remember { mutableStateOf(initialPlaylistId) }
-    // Tab taps land immediately. Swiping remains animated, but animating a
-    // tap composes and disposes heavy pages while the gesture is in flight.
+    // Adjacent tabs glide (neighbors stay composed, so it's smooth); far
+    // taps jump instantly — animating a multi-page hop composes heavy pages
+    // mid-flight and reintroduces the jank the jump was there to avoid.
     fun goToPage(page: Int) {
         if (pagerState.currentPage == page) return
         scope.launch {
-            pagerState.scrollToPage(page)
+            if (kotlin.math.abs(pagerState.currentPage - page) == 1 && !reduceMotion) {
+                pagerState.animateScrollToPage(
+                    page,
+                    animationSpec = androidx.compose.animation.core.tween(
+                        durationMillis = 260,
+                        easing = com.rada.ui.theme.MotionArrival,
+                    ),
+                )
+            } else {
+                pagerState.scrollToPage(page)
+            }
         }
     }
 

app/src/main/java/com/rada/ui/theme/Motion.kt

@@ -1,6 +1,7 @@
 package com.rada.ui.theme
 
 import androidx.compose.ui.unit.dp
+import androidx.compose.runtime.Composable
 import androidx.compose.animation.core.animateFloatAsState
 import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.interaction.collectIsPressedAsState
@@ -130,12 +131,15 @@ fun feedbackDuration(reduce: Boolean): Int = if (reduce) 0 else FeedbackMs
 /**
  * Press-dip for list rows: scales to 0.97 while pressed. Use on rows that
  * already have a clickable/combinedClickable modifier earlier in the chain.
+ * (A plain @Composable extension — the old composed{} form spun up an extra
+ * subcomposition per row, wasted recomposition churn in long lists.)
  */
+@Composable
 fun Modifier.pressDip(
     interactionSource: MutableInteractionSource,
     reduce: Boolean,
-): Modifier = composed {
-    if (reduce) return@composed this
+): Modifier {
+    if (reduce) return this
     val pressed by interactionSource.collectIsPressedAsState()
     val scale by animateFloatAsState(
         targetValue = if (pressed) 0.97f else 1f,
@@ -145,7 +149,7 @@ fun Modifier.pressDip(
         ),
         label = "pressDip",
     )
-    this.graphicsLayer { scaleX = scale; scaleY = scale }
+    return this.graphicsLayer { scaleX = scale; scaleY = scale }
 }
 
 // ── Dismiss-by-drag ───────────────────────────────────────────────────────