feat(ui): mini-player buffering pose + one-tap retry on error

- Equalizer chip dims while BUFFERING/INITIALIZING (no false 'playing'
  signal during reconnect)
- On ERROR the bar's subtitle becomes 'Couldn't reach · Retry' —
  tapping replays the current station without leaving the tab
- NowPlayingViewModel.retry() re-plays current URL

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

@@ -65,6 +65,10 @@ fun NowPlayingBar(
     val isLocal by viewModel.isLocal.collectAsState()
     val streamMeta by viewModel.streamMeta.collectAsState()
     val localMedia by viewModel.localMedia.collectAsState()
+    val isError = bufferState == PlaybackManager.BufferState.ERROR
+    val isBuffering =
+        bufferState == PlaybackManager.BufferState.BUFFERING ||
+        bufferState == PlaybackManager.BufferState.INITIALIZING
     // Swipe-down (or quick drag-down) dismisses the bar until a *new*
     // source starts playing — a floating thing should answer to gestures.
     var dismissedFor by remember { mutableStateOf<String?>(null) }
@@ -145,13 +149,22 @@ fun NowPlayingBar(
                         .background(LocalTokens.current.accentFill),
                     contentAlignment = Alignment.Center,
                 ) {
-                    if (isPlaying) {
+                    if (isPlaying && !isBuffering) {
                         EqualizerBars(
                             active = true,
                             color = LocalTokens.current.accentOnFill,
                             barWidth = 3.dp,
                             modifier = Modifier.size(22.dp),
                         )
+                    } else if (isBuffering && !isError) {
+                        EqualizerBars(
+                            active = false,
+                            color = LocalTokens.current.accentOnFill.copy(alpha = 0.7f),
+                            barWidth = 3.dp,
+                            modifier = Modifier
+                                .size(22.dp)
+                                .padding(2.dp),
+                        )
                     } else {
                         Icon(
                             if (isLocal) Icons.Default.MusicNote else Icons.Default.Radio,
@@ -186,7 +199,28 @@ fun NowPlayingBar(
                                 color = LocalTokens.current.text,
                             )
                         }
-                        if (subtitle.isNotEmpty()) {
+                        if (isError) {
+                            Row(
+                                verticalAlignment = Alignment.CenterVertically,
+                                modifier = Modifier.clickable(
+                                    interactionSource = remember { MutableInteractionSource() },
+                                    indication = null,
+                                    onClick = { viewModel.retry() },
+                                ),
+                            ) {
+                                Text(
+                                    "Couldn't reach · ",
+                                    style = MaterialTheme.typography.bodySmall,
+                                    color = MaterialTheme.colorScheme.error,
+                                )
+                                Text(
+                                    "Retry",
+                                    style = MaterialTheme.typography.bodySmall,
+                                    fontWeight = FontWeight.Bold,
+                                    color = tokens.accentText,
+                                )
+                            }
+                        } else if (subtitle.isNotEmpty()) {
                             AnimatedContent(
                                 targetState = subtitle,
                                 transitionSpec = { metadataEnter(reduce) togetherWith metadataExit(reduce) },

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

@@ -23,4 +23,10 @@ class NowPlayingViewModel @Inject constructor(
     fun togglePlayPause() {
         playbackManager.togglePlayPause()
     }
+
+    /** Reconnect the current station (mini-player error state). */
+    fun retry() {
+        val url = playbackManager.currentStationUrl ?: return
+        playbackManager.playStation(url, playbackManager.currentStationName)
+    }
 }