feat: implemented the logic to automatically create a chord when a suitable guide chord is highlighted.

src/core/state/KGPianoRollState.ts

@@ -17,6 +17,9 @@ export class KGPianoRollState {
   // Chord guide state
   private currentSuitableChords: Record<string, string[]> = {}; // Map of chord symbols to note names (e.g., {"I": ["C", "E", "G"]})
   private currentSuitableChordsPitchClasses: Record<string, number[]> = {}; // Map of chord symbols to pitch classes (e.g., {"I": [0, 4, 7]})
+  private currentMatchingChords: number[][] = [];
+  private currentSelectedChordIndex: number = 0;
+  private currentChordCursorPitch: number | null = null;
 
   private constructor() {
     console.log("KGPianoRollState initialized");
@@ -77,4 +80,28 @@ export class KGPianoRollState {
   public setCurrentSuitableChordsPitchClasses(chordsPitchClasses: Record<string, number[]>): void {
     this.currentSuitableChordsPitchClasses = chordsPitchClasses;
   }
+
+  public getCurrentMatchingChords(): number[][] {
+    return this.currentMatchingChords;
+  }
+
+  public setCurrentMatchingChords(chords: number[][]): void {
+    this.currentMatchingChords = chords;
+  }
+
+  public getCurrentSelectedChordIndex(): number {
+    return this.currentSelectedChordIndex;
+  }
+
+  public setCurrentSelectedChordIndex(index: number): void {
+    this.currentSelectedChordIndex = index;
+  }
+
+  public getCurrentChordCursorPitch(): number | null {
+    return this.currentChordCursorPitch;
+  }
+
+  public setCurrentChordCursorPitch(pitch: number | null): void {
+    this.currentChordCursorPitch = pitch;
+  }
 }