new: add playback state handling across platforms and integrate main play action in PlayerScreen

core/audioplayer/build.gradle.kts

@@ -48,6 +48,9 @@ kotlin {
             implementation(libs.vorbisspi)
         }
         commonMain.dependencies {
+            // Coroutines
+            implementation(libs.kotlinx.coroutinesCore)
+
             // DI
             implementation(project.dependencies.platform(libs.koin.bom))
             implementation(libs.koin.core)