fix: star visibility, station switching, skip-ahead, and latency optimizations

- Star icons now use distinct tint colors (primary vs faded) for clear state
- Station switching no longer races — old playback job is cancelled before new
- Skip-ahead drops ~1s of buffered audio per tap via atomic counter
- Custom SocketFactory with SO_RCVBUF=16KB and TCP_NODELAY for minimal TCP buffering
- Catch-up drain: discards pre-buffered frames until network reads block (live edge)
- AudioTrack PERFORMANCE_MODE_LOW_LATENCY for smallest hardware buffer

Made-with: Cursor

chat-summaries/2026-03-09_bugfix-and-seek-to-live.md

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+# Bugfix: Star icons, station switching, and seek-to-live
+
+**Date:** 2026-03-09
+
+## Task description
+Fixed three issues found during manual testing of the app.
+
+## Changes made
+
+### 1. Star icon visual state (StationListScreen.kt)
+- Added explicit tint colors to star icons: `primary` color when starred, faded `onSurfaceVariant` (40% alpha) when unstarred.
+- Applies to both station rows and playlist section headers.
+
+### 2. Station switching race condition (RadioPlaybackService.kt)
+- Added `playJob` tracking — each new play request cancels the previous playback coroutine before starting a new one.
+- The old job's `finally` block now checks `playJob == coroutineContext[Job]` to avoid calling `cleanup()`/`stopSelf()` when being replaced by a new station.
+- Tapping the same station now restarts it (re-fires `ACTION_PLAY`).
+- Fixed collector coroutine leak: `return@collect` on terminal events (`Error`, `Stopped`) so the SharedFlow collection terminates.
+
+### 3. Seek-to-live feature
+- Added `ACTION_SEEK_LIVE` to `RadioPlaybackService` — ends current connection span, stops/restarts the engine for the current station without creating a new `ListeningSession`.
+- Added `seekToLive()` to `RadioController`.
+- Added `seekToLive()` to `NowPlayingViewModel`.
+- Added "SKIP TO LIVE" `FilledTonalButton` to `NowPlayingScreen`, positioned between latency indicator and Stay Connected toggle. Disabled during reconnection.
+
+## Files changed
+- `app/src/main/java/.../ui/screens/stationlist/StationListScreen.kt`
+- `app/src/main/java/.../service/RadioPlaybackService.kt`
+- `app/src/main/java/.../service/RadioController.kt`
+- `app/src/main/java/.../ui/screens/nowplaying/NowPlayingScreen.kt`
+- `app/src/main/java/.../ui/screens/nowplaying/NowPlayingViewModel.kt`
+
+## Follow-up items
+- None identified.