feat(ui): implement edge-to-edge support and improve splash transition

- Enable edge-to-edge display in `MainActivity` and handle window insets in `PlayerFragment`.
- Add a fade-out animation when hiding the loading overlay.
- Sync player state with the controller during setup and reset playing state in preferences on service destruction.
- Simplify splash screen drawable and update background color attributes in layout.
- Remove manual navigation bar color overrides.

app/src/main/java/com/michatec/radio/PlayerService.kt

@@ -81,7 +81,8 @@ class PlayerService : MediaLibraryService() {
 
     /* Overrides onDestroy from Service */
     override fun onDestroy() {
-        // player.removeAnalyticsListener(analyticsListener)
+        // Reset playing state in preferences
+        PreferencesHelper.saveIsPlaying(false)
         player.removeListener(playerListener)
         player.release()
         mediaLibrarySession.release()