Refactor frontend build and chart initialization

Moves chart data to JSON file for better separation of concerns
Implements lazy chart initialization in reports module
Updates build script and npm dependencies
Removes hardcoded chart scripts from Razor page

PlanTempus.Application/wwwroot/ts/app.ts

@@ -62,7 +62,7 @@ let app: App;
 function init(): void {
   app = new App();
 
-  // Expose to window for debugging
+  // Expose app to window for debugging
   if (typeof window !== 'undefined') {
     (window as unknown as { app: App }).app = app;
   }