Refactor KeyboardComponent key rendering logic

Extracted white and black key rendering into separate `renderWhiteKeys` and `renderBlackKeys` functions for improved readability and modularity. Simplified drawing logic by delegating key rendering to these helper functions.

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

@@ -1,5 +1,6 @@
 package nl.astraeus.vst.ui.components
 
+import kotlinx.html.SVG
 import kotlinx.html.div
 import kotlinx.html.js.onMouseDownFunction
 import kotlinx.html.js.onMouseLeaveFunction
@@ -196,37 +197,47 @@ class KeyboardComponent(
           }
 
           // Draw white keys
-          for (i in 0 until WHITE_KEYS_PER_OCTAVE) {
-            val midiNote = whiteKeys[i] + getOctaveOffset()
-            val isPressed = pressedNotes.contains(midiNote)
-            rect(
-              i * whiteKeyWidth,
-              0,
-              whiteKeyWidth,
-              keyboardHeight,
-              0,
-              if (isPressed) WhiteKeyPressedCls.name else WhiteKeyCls.name
-            )
-          }
+          this.renderWhiteKeys()
 
           // Draw black keys
-          for (i in 0 until BLACK_KEYS_PER_OCTAVE) {
-            val midiNote = blackKeys[i] + getOctaveOffset()
-            val isPressed = pressedNotes.contains(midiNote)
-            rect(
-              blackKeyPositions[i],
-              0,
-              blackKeyWidth,
-              blackKeyHeight,
-              0,
-              if (isPressed) BlackKeyPressedCls.name else BlackKeyCls.name
-            )
-          }
+          this.renderBlackKeys()
         }
       }
     }
   }
 
+  // Render white keys
+  private fun SVG.renderWhiteKeys() {
+    for (i in 0 until WHITE_KEYS_PER_OCTAVE) {
+      val midiNote = whiteKeys[i] + getOctaveOffset()
+      val isPressed = pressedNotes.contains(midiNote)
+      rect(
+        i * whiteKeyWidth,
+        0,
+        whiteKeyWidth,
+        keyboardHeight,
+        0,
+        if (isPressed) WhiteKeyPressedCls.name else WhiteKeyCls.name
+      )
+    }
+  }
+
+  // Render black keys
+  private fun SVG.renderBlackKeys() {
+    for (i in 0 until BLACK_KEYS_PER_OCTAVE) {
+      val midiNote = blackKeys[i] + getOctaveOffset()
+      val isPressed = pressedNotes.contains(midiNote)
+      rect(
+        blackKeyPositions[i],
+        0,
+        blackKeyWidth,
+        blackKeyHeight,
+        0,
+        if (isPressed) BlackKeyPressedCls.name else BlackKeyCls.name
+      )
+    }
+  }
+
   companion object : CssId("keyboard") {
     // CSS class names
     object KeyboardCls : CssName()