Fix Side Navigation issues (toggle and on refresh)

[lacksfish]

Toggling the sidenav had some issues (on mobile and desktop view), which I believe these changes will fix.

For example:

• The mobile view considers the sidenav to not be visible initially, although the default flag is set to true. Therefore the menu button needs to be clicked twice for the menu to appear.
• In the desktop view, upon refreshing the page, the sidebar becomes visible; however, the associated content does not reposition correctly and remains overlaid by the sidebar instead of being properly moved to the side.
• Added backdroup-clicked event handler based on Angular documentation

I also took the liberty to add a watch command (npm run watchfrontenddev) for the frontend to the package.json

This PR does not include the associated production build for clarity of code changes.

Summary by CodeRabbit

• New Features
  • Implemented a backdrop click feature for the side navigation panel.
• Bug Fixes
  • Fixed an issue where the side navigation state was not toggled correctly on certain events.

[saubyk]

@coderabbitai review

[coderabbitai[bot]]

Walkthrough

The changes involve updates to the Angular application's side navigation behavior. A new method backdropClicked() has been added to handle clicks on the backdrop of the side navigation. Additionally, a flag flgSideNavOpened is now toggled whenever the side navigation is opened or closed, improving the state management of the side navigation visibility across different screen sizes and login states.

Changes

File Path	Change Summary
.../app.component.html	Added (backdropClick) event binding to <mat-sidenav-container>. Fixed a typo by removing an extra > from </mat-sidenav-content>.
.../app.component.ts	Introduced flgSideNavOpened toggle in ngAfterViewInit(), onNavigationClicked(), and backdropClicked() methods.

🐇✨ In the land of code, where sidebars slide, A rabbit hopped through, with changes applied. Click the backdrop, the side shall hide, State toggles on, with every stride. 🌟🚪

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