Remove KeyboardInputComponent and add file upload and WebSocket support

Deleted unused `KeyboardInputComponent`. Added file upload functionality to `MainView` with WebSocket event handling. Introduced `WebsocketClient` class for managing server connection and file transmission. Enhanced `KeyboardComponent` with configurable key rounding. Updated `WebsocketHandler` for improved binary message handling and storage.

src/jsMain/kotlin/nl/astraeus/vst/ui/components/KeyboardComponent.kt

@@ -38,6 +38,7 @@ class KeyboardComponent(
   initialOctave: Int = 4,
   val keyboardWidth: Int = 210,
   val keyboardHeight: Int = keyboardWidth / 2,
+  val rounding: Int = 4,
   val onNoteDown: (Int) -> Unit = {},
   val onNoteUp: (Int) -> Unit = {}
 ) : Komponent() {
@@ -222,7 +223,7 @@ class KeyboardComponent(
         0,
         whiteKeyWidth,
         keyboardHeight,
-        0,
+        rounding,
         if (isPressed) WhiteKeyPressedCls.name else WhiteKeyCls.name
       )
     }
@@ -238,7 +239,7 @@ class KeyboardComponent(
         0,
         blackKeyWidth,
         blackKeyHeight,
-        0,
+        rounding,
         if (isPressed) BlackKeyPressedCls.name else BlackKeyCls.name
       )
     }