chore(types): scattered the type interfaces

scattered type interfaces wih goal of scalability and easier debug and coding

src/types/PlaybackState.ts

@@ -0,0 +1,14 @@
+/**
+ * player state type interface
+ *
+ * author: db123 at db
+ * creation: 28/4/2026
+ */
+
+export interface PlayerEvents {
+  onPlay?: () => void;
+  onPause?: () => void;
+  onEnd?: () => void;
+  onError?: () => void;
+  onBuffer?: () => void;
+}