feat: implement station navigation and update to SDK 37

- Implement `seekToNext` and `seekToPrevious` in `PlayerService` to allow switching between radio stations.
- Update `compileSdk` and `targetSdk` to 37 and bump version to 14.6.
- Modify `PlayerService` to remain active while paused to improve playback resumption.
- Modernize media resumption logic using Media3 `isRecent` check instead of legacy extras.
- Refactor `DefaultRenderersFactory` to use non-nullable `AudioSink` return types.
- General code cleanup using KTX extensions (e.g., `View.isEmpty()`) and Kotlin property access syntax.

app/src/main/java/com/michatec/radio/search/SearchResultAdapter.kt

@@ -171,7 +171,7 @@ class SearchResultAdapter(
                     context: Context,
                     enableFloatOutput: Boolean,
                     enableAudioTrackPlaybackParams: Boolean
-                ): AudioSink? {
+                ): AudioSink {
                     return DefaultAudioSink.Builder(context)
                         .setAudioProcessors(arrayOf(nativeAudioProcessor))
                         .build()