connects #119

This pull request adds support for Progressive Web App (PWA) features to the Angular application, including service worker integration for offline capability and update notifications. It introduces a manifest file for PWA configuration, registers the Angular service worker, and adds UI components and services to notify users when updates are available.

PWA Integration and Service Worker Setup

• Added @angular/service-worker dependency and registered the service worker in app.module.ts for production builds, using a delayed registration strategy to ensure stability. (package.json [1] src/app/app.module.ts [2] [3]
• Created ngsw-config.json to configure caching strategies for application files and assets, enabling offline support. (ngsw-config.json ngsw-config.jsonR1-R30)
• Updated angular.json to include the manifest file in assets and reference the service worker config for production builds. (angular.json [1] [2] [3]

Manifest and PWA Metadata

• Added manifest.webmanifest with app name, icons, display mode, and start URL for PWA installation and theming. (src/manifest.webmanifest src/manifest.webmanifestR1-R33)
• Linked the manifest file in index.html to enable browser PWA features. (src/index.html src/index.htmlR21-R26)

Update Notification Feature

• Implemented UpdateCheckService to listen for service worker updates and periodically check for new versions, triggering update notifications. (src/app/core-components/update-check/update-check.service.ts src/app/core-components/update-check/update-check.service.tsR1-R44)
• Added UpdateCheckComponent to display a toast notification when an update is available, allowing users to reload the page to apply updates. (src/app/core-components/update-check/update-check.component.ts [1] src/app/core-components/update-check/update-check.component.html [2] src/app/core-components/update-check/update-check.component.css [3]
• Integrated the update notification component into the main app layout and declared it in the module. (src/app/app.component.html [1] src/app/app.module.ts [2]

Testing

• Added basic unit tests for the new update check service and component to ensure their creation and integration. (src/app/core-components/update-check/update-check.service.spec.ts [1] src/app/core-components/update-check/update-check.component.spec.ts [2]