perf(app): fluid navigation + genre search

Directory search now merges name and tag(genre) hits so genre queries
find tagged stations. Tabs jump instantly (adjacent glide, swipe kept);
startup pre-builds disk-backed singletons off main thread; equalizer
animation runs only on the playing indicator; row placement animations;
missing list key. Debug-only StrictMode guard for main-thread I/O.
Release signed with debug key for direct installs.

app/build.gradle.kts

@@ -24,6 +24,9 @@ android {
     buildTypes {
         release {
             isMinifyEnabled = true
+            // Personal test builds: sign release with the debug key so it can
+            // be installed directly. Production releases must use a real key.
+            signingConfig = signingConfigs.getByName("debug")
             proguardFiles(
                 getDefaultProguardFile("proguard-android-optimize.txt"),
                 "proguard-rules.pro"

app/src/main/java/com/rada/SatsAmpApp.kt

@@ -1,6 +1,8 @@
 package com.rada
 
 import android.app.Application
+import android.content.pm.ApplicationInfo
+import android.os.StrictMode
 import com.rada.ui.theme.UiPrefs
 import dagger.hilt.android.HiltAndroidApp
 
@@ -8,6 +10,19 @@ import dagger.hilt.android.HiltAndroidApp
 class SatsAmpApp : Application() {
     override fun onCreate() {
         super.onCreate()
+        if (applicationInfo.flags and ApplicationInfo.FLAG_DEBUGGABLE != 0) {
+            // Log (never crash) main-thread disk/network hits so jank
+            // sources show up in logcat with a stack trace.
+            StrictMode.setThreadPolicy(
+                StrictMode.ThreadPolicy.Builder()
+                    .detectDiskReads()
+                    .detectDiskWrites()
+                    .detectNetwork()
+                    .detectCustomSlowCalls()
+                    .penaltyLog()
+                    .build(),
+            )
+        }
         UiPrefs.init(this)
     }
 }

app/src/main/java/com/rada/data/repository/RadioBrowserRepository.kt

@@ -36,22 +36,42 @@ class RadioBrowserRepository @Inject constructor() {
     private val client = OkHttpClient.Builder().build()
     private val json = Json { ignoreUnknownKeys = true }
 
+    /**
+     * Name matches first, then tag (genre) matches — one query rarely covers
+     * both ("jazz" as a name vs. as a tag). Each leg fetches up to [limit]
+     * and the merged list is capped at [limit].
+     */
     suspend fun search(query: String, limit: Int = 30): List<Station> =
         withContext(Dispatchers.IO) {
-            val url = BASE
+            val q = query.trim()
+            val byName = fetch(mapOf("name" to q), limit)
+            val byTag = runCatching { fetch(mapOf("tag" to q), limit) }.getOrDefault(emptyList())
+            mergeResults(byName, byTag, limit)
+        }
+
+    /** Name hits keep their order; tag hits append, de-duplicated by id. */
+    internal fun mergeResults(
+        byName: List<Station>,
+        byTag: List<Station>,
+        limit: Int,
+    ): List<Station> {
+        if (byTag.isEmpty()) return byName.take(limit)
+        val seen = byName.map { it.id }.toHashSet()
+        return (byName + byTag.filter { seen.add(it.id) }).take(limit)
+    }
+
+    private fun fetch(params: Map<String, String>, limit: Int): List<Station> {
+        val builder = BASE
             .toHttpUrl()
             .newBuilder()
             .addPathSegments("json/stations/search")
-                .addQueryParameter("name", query.trim())
             .addQueryParameter("hidebroken", "true")
             .addQueryParameter("limit", limit.toString())
             .addQueryParameter("order", "clickcount")
             .addQueryParameter("reverse", "true")
-                .build()
+        params.forEach { (k, v) -> builder.addQueryParameter(k, v) }
-                .toString()
-
         val request = Request.Builder()
-                .url(url)
+            .url(builder.build().toString())
             .header("User-Agent", "SatsAmp/1.0 (personal radio player)")
             .build()
 
@@ -60,7 +80,7 @@ class RadioBrowserRepository @Inject constructor() {
                 throw IllegalStateException("Directory search failed: ${response.code}")
             }
             val body = response.body?.string().orEmpty()
-                json.decodeFromString<List<ApiStation>>(body).map { it.toStation() }
+            return json.decodeFromString<List<ApiStation>>(body).map { it.toStation() }
         }
     }
 

app/src/main/java/com/rada/di/AppModule.kt

@@ -7,10 +7,13 @@ import com.rada.data.local.dao.SavedSongDao
 import com.rada.data.repository.LibraryRepository
 import com.rada.data.repository.PlaylistRepository
 import com.rada.data.repository.StationRepository
+import com.rada.data.repository.StreamRepository
+import com.rada.data.wavlake.WavlakeRepository
 import com.rada.data.wavlake.WavlakeApi
 import com.rada.player.PlaybackManager
 import dagger.Module
 import dagger.Provides
+import dagger.hilt.EntryPoint
 import dagger.hilt.InstallIn
 import dagger.hilt.android.qualifiers.ApplicationContext
 import dagger.hilt.components.SingletonComponent
@@ -67,3 +70,17 @@ object AppModule {
     @Singleton
     fun provideWavlakeApi(): WavlakeApi = WavlakeApi()
 }
+
+/**
+ * Entry point for warming disk-backed singletons off the main thread at
+ * startup (see MainActivity). Their constructors do SharedPreferences/JSON
+ * I/O (~130–290ms); Hilt builds them lazily, so without warming that cost
+ * lands inside first page composition and stalls tab switches.
+ */
+@EntryPoint
+@InstallIn(SingletonComponent::class)
+interface WarmEntryPoint {
+    fun stationRepository(): StationRepository
+    fun streamRepository(): StreamRepository
+    fun wavlakeRepository(): WavlakeRepository
+}

app/src/main/java/com/rada/ui/MainActivity.kt

@@ -14,13 +14,18 @@ import androidx.compose.material3.Surface
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.core.content.ContextCompat
+import androidx.lifecycle.lifecycleScope
 import androidx.navigation.compose.rememberNavController
+import com.rada.di.WarmEntryPoint
 import com.rada.player.PlaybackManager
 import com.rada.ui.navigation.NavGraph
 import com.rada.ui.theme.GlassBackground
 import com.rada.ui.theme.SatsAmpTheme
 import dagger.hilt.android.AndroidEntryPoint
+import dagger.hilt.android.EntryPointAccessors
 import javax.inject.Inject
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
 
 @AndroidEntryPoint
 class MainActivity : ComponentActivity() {
@@ -43,6 +48,7 @@ class MainActivity : ComponentActivity() {
         enableEdgeToEdge()
         playbackManager.connect()
         askNotificationPermissionOnce()
+        warmRepositories()
 
         setContent {
             SatsAmpTheme {
@@ -63,6 +69,26 @@ class MainActivity : ComponentActivity() {
         super.onDestroy()
     }
 
+    /**
+     * Pre-build the disk-backed singletons on a background thread. Without
+     * this, Hilt constructs them lazily on first injection — inside page
+     * composition — and their SharedPreferences/JSON reads (~130–290ms)
+     * stall tab switches. Hilt caches singletons thread-safely, so later
+     * main-thread access is free.
+     */
+    private fun warmRepositories() {
+        lifecycleScope.launch(Dispatchers.IO) {
+            runCatching {
+                val entry = EntryPointAccessors.fromApplication(
+                    applicationContext, WarmEntryPoint::class.java,
+                )
+                entry.stationRepository().getAll()
+                entry.streamRepository().getAll()
+                entry.wavlakeRepository().isStationEnabled("")
+            }
+        }
+    }
+
     private fun askNotificationPermissionOnce() {
         if (Build.VERSION.SDK_INT < 33) return
         val prefs = getPreferences(MODE_PRIVATE)

app/src/main/java/com/rada/ui/components/EqualizerBars.kt

@@ -24,6 +24,10 @@ import com.rada.ui.theme.LocalReduceMotion
  * the active source (Spotify's equalizer). Bars pulse out of phase; paused
  * freezes them mid-height so the shape still reads as "the equalizer", and
  * reduce-motion renders a static, even-bar version.
+ *
+ * The infinite transition runs ONLY while actively playing: every mounted
+ * instance otherwise spins at display refresh rate and invalidates its row
+ * every frame, which is pure jank in long lists.
  */
 @Composable
 fun EqualizerBars(
@@ -33,6 +37,11 @@ fun EqualizerBars(
     barWidth: Dp = 2.5.dp,
 ) {
     val reduce = LocalReduceMotion.current
+    if (!active || reduce) {
+        // Frozen heights (mid-range, uneven = still "eq"). No animation running.
+        EqCanvas(h1 = 0.6f, h2 = 1f, h3 = 0.45f, color = color, modifier = modifier, barWidth = barWidth)
+        return
+    }
     val transition = rememberInfiniteTransition(label = "eq")
     // Out-of-phase sine-ish pulses; different durations keep bars unsynced.
     val b1 by transition.animateFloat(
@@ -53,11 +62,18 @@ fun EqualizerBars(
             animation = tween(440), repeatMode = RepeatMode.Reverse,
         ), label = "b3",
     )
-    // Frozen heights for the paused pose (mid-range, uneven = still "eq").
+    EqCanvas(h1 = b1, h2 = b2, h3 = b3, color = color, modifier = modifier, barWidth = barWidth)
-    val h1 = if (reduce || !active) 0.6f else b1
+}
-    val h2 = if (reduce || !active) 1f else b2
-    val h3 = if (reduce || !active) 0.45f else b3
 
+@Composable
+private fun EqCanvas(
+    h1: Float,
+    h2: Float,
+    h3: Float,
+    color: Color,
+    modifier: Modifier,
+    barWidth: Dp,
+) {
     Canvas(modifier = modifier.size(14.dp)) {
         val gap = this.size.width / 8f
         val w = barWidth.toPx()

app/src/main/java/com/rada/ui/discover/DiscoverScreen.kt

@@ -448,6 +448,7 @@ private fun RankingsList(
                             onPlay = { viewModel.playTrack(track) },
                             onSave = { viewModel.saveTrack(track) },
                             onZap = { t -> onZap(t, addresses[t.artistId]) },
+                            modifier = Modifier.animateItem(),
                         )
                     }
                 }
@@ -464,11 +465,12 @@ fun TrackRow(
     onPlay: () -> Unit,
     onSave: () -> Unit,
     onZap: (WavlakeTrack) -> Unit,
+    modifier: Modifier = Modifier,
 ) {
     val tokens = LocalTokens.current
     Card(
         onClick = onPlay,
-        modifier = Modifier
+        modifier = modifier
             .fillMaxWidth()
             .padding(horizontal = 12.dp),
         colors = CardDefaults.cardColors(containerColor = tokens.glassFillStrong),
@@ -782,6 +784,7 @@ fun ArtistDetailView(
                                 if (t.isZapPayable) detailTrackZap = t
                             }
                         },
+                        modifier = Modifier.animateItem(),
                     )
                     detailTrackZap?.let { zt ->
                         WavlakeZapSheet(

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

@@ -36,7 +36,8 @@ import kotlinx.coroutines.launch
 /**
  * The five peer tabs as a swipeable pager (Spotify's horizontal structure):
  * Stations · Discover · Library · Streams · Playlists. Synced with the
- * bottom bar; swiping follows the finger, tab taps animate. The mini-player
+ * bottom bar; swiping follows the finger, tab taps jump (adjacent tabs
+ * glide). The mini-player
  * sits above the nav bar so playback controls are always reachable.
  */
 @Composable
@@ -50,6 +51,18 @@ fun TabsScreen(
     val scope = rememberCoroutineScope()
     // Deep-link target for Library (playlist picker → open that playlist).
     var libraryPlaylistId by remember { mutableStateOf(initialPlaylistId) }
+    // Tab taps jump: swiping is the animated path, but animating a tap from
+    // Stations → Playlists scrolls through (and composes) every page in
+    // between — that mid-flight compose/dispose churn is the jumpiness.
+    // Adjacent taps still glide; distant ones land instantly like Spotify.
+    fun goToPage(page: Int) {
+        val from = pagerState.currentPage
+        if (from == page) return
+        scope.launch {
+            if (kotlin.math.abs(from - page) == 1) pagerState.animateScrollToPage(page)
+            else pagerState.scrollToPage(page)
+        }
+    }
 
     Scaffold(
         containerColor = MaterialTheme.colorScheme.background,
@@ -70,10 +83,11 @@ fun TabsScreen(
                     )
                     items.forEach { (label, icon, page) ->
                         NavigationBarItem(
-                            selected = pagerState.settledPage == page,
+                            // currentPage tracks the finger/target live; settledPage
-                            onClick = {
+                            // lags until the animation ends and the highlight
-                                scope.launch { pagerState.animateScrollToPage(page) }
+                            // feels glued to the old tab.
-                            },
+                            selected = pagerState.currentPage == page,
+                            onClick = { goToPage(page) },
                             icon = { Icon(icon, contentDescription = label) },
                             label = { Text(label) },
                             colors = NavigationBarItemDefaults.colors(
@@ -121,7 +135,7 @@ fun TabsScreen(
                     onHome = onHome,
                     onPlaylistSelected = { playlistId ->
                         libraryPlaylistId = playlistId
-                        scope.launch { pagerState.animateScrollToPage(2) }
+                        goToPage(2)
                     },
                 )
             }

app/src/main/java/com/rada/ui/player/PlayerScreen.kt

@@ -844,7 +844,7 @@ private fun PlaylistPickerDialog(
                     LazyColumn(
                         modifier = Modifier.heightIn(max = 200.dp),
                     ) {
-                        items(filteredPlaylists) { playlist ->
+                        items(filteredPlaylists, key = { it.id }) { playlist ->
                             val checked = playlist.id in selectedIds
                             Row(
                                 modifier = Modifier

app/src/main/java/com/rada/ui/stations/StationBrowserScreen.kt

@@ -298,6 +298,7 @@ fun StationBrowserScreen(
                     item { SectionHeader("Starred", Icons.Default.Star) }
                     items(favorites, key = { "fav-${it.id}" }, contentType = { "station" }) { station ->
                         StationCard(
+                            modifier = Modifier.animateItem(),
                             station = station,
                             isFavorite = true,
                             isPlaying = playingUrl == station.url,
@@ -321,6 +322,7 @@ fun StationBrowserScreen(
                     }
                     items(stations, key = { it.id }, contentType = { "station" }) { station ->
                         StationCard(
+                            modifier = Modifier.animateItem(),
                             station = station,
                             isFavorite = viewModel.isFavorite(station.id),
                             isPlaying = playingUrl == station.url,
@@ -411,6 +413,7 @@ fun StationBrowserScreen(
                             item { DirectorySectionHeader("From the directory") }
                             items(ds.stations, key = { "rb-${it.id}" }, contentType = { "station" }) { station ->
                                 StationCard(
+                                    modifier = Modifier.animateItem(),
                                     station = station,
                                     isFavorite = viewModel.isFavorite(station.id),
                                     isPlaying = playingUrl == station.url,
@@ -791,11 +794,12 @@ private fun StationCard(
     onAdd: (() -> Unit)? = null,
     wavlakeEnabled: Boolean = false,
     onToggleWavlake: (() -> Unit)? = null,
+    modifier: Modifier = Modifier,
 ) {
     val tokens = LocalTokens.current
     Card(
         onClick = onClick,
-        modifier = Modifier
+        modifier = modifier
             .fillMaxWidth()
             .padding(horizontal = 12.dp),
         colors = CardDefaults.cardColors(

app/src/test/java/com/rada/data/repository/RadioBrowserSearchTest.kt

@@ -0,0 +1,57 @@
+package com.rada.data.repository
+
+import com.rada.domain.model.Station
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+/**
+ * Directory search merges name hits with tag (genre) hits so a query like
+ * "jazz" finds stations merely tagged jazz, not just named jazz.
+ */
+class RadioBrowserSearchTest {
+
+    private val repo = RadioBrowserRepository()
+
+    private fun station(id: String, name: String) =
+        Station(id = id, name = name, url = "https://example.com/$id")
+
+    @Test
+    fun `name hits come first, tag hits append`() {
+        val merged = repo.mergeResults(
+            byName = listOf(station("rb-1", "Jazz FM")),
+            byTag = listOf(station("rb-2", "Smooth Grooves")),
+            limit = 30,
+        )
+        assertEquals(listOf("rb-1", "rb-2"), merged.map { it.id })
+    }
+
+    @Test
+    fun `duplicates are removed, name copy wins`() {
+        val merged = repo.mergeResults(
+            byName = listOf(station("rb-1", "Jazz FM")),
+            byTag = listOf(station("rb-1", "Jazz FM"), station("rb-2", "Blue Note")),
+            limit = 30,
+        )
+        assertEquals(listOf("rb-1", "rb-2"), merged.map { it.id })
+    }
+
+    @Test
+    fun `merged list is capped at limit`() {
+        val merged = repo.mergeResults(
+            byName = listOf(station("rb-1", "A"), station("rb-2", "B")),
+            byTag = listOf(station("rb-3", "C")),
+            limit = 2,
+        )
+        assertEquals(listOf("rb-1", "rb-2"), merged.map { it.id })
+    }
+
+    @Test
+    fun `empty tag leg returns name hits capped`() {
+        val merged = repo.mergeResults(
+            byName = listOf(station("rb-1", "A"), station("rb-2", "B")),
+            byTag = emptyList(),
+            limit = 1,
+        )
+        assertEquals(listOf("rb-1"), merged.map { it.id })
+    }
+}