feat: add snap-to-grid toggle for track grid regions and playhead

src/core/state/KGMainContentState.ts

@@ -6,6 +6,7 @@ export class KGMainContentState {
   private static _instance: KGMainContentState | null = null;
 
   private activeTool: string = "pointer";
+  private snapping: boolean = true;
 
   private constructor() {
     console.log("KGMainContentState initialized");
@@ -26,4 +27,12 @@ export class KGMainContentState {
   public setActiveTool(tool: string): void {
     this.activeTool = tool;
   }
+
+  public isSnappingEnabled(): boolean {
+    return this.snapping;
+  }
+
+  public setSnapping(enabled: boolean): void {
+    this.snapping = enabled;
+  }
 }