Introduces error state management in LoadingService, displays error bar and snackbar notifications in the UI, and updates ScheduleComponent to use the new error handling. Also adds custom theming for error snackbar and progress bar.
Introduced Header2Component with a new design, external resource links, and a loading progress bar. Added LoadingService to manage loading state and integrated it into the schedule component. Updated main layout to use the new header and included related assets for external links. Changed API base URL in HttpService to use the production endpoint.
