Fix: Refresh Token in Custom Interceptor

[GODrums]

Preview Deployment

This PR has a Preview-Deployment for testing: https://pr191.hephaestus.felixdietrich.com/

Motivation

Follow-up on #190. Tokens previously did not get refreshed correctly when minimizing or losing the focus of the tab.

Description

This PR changes how access tokens are refreshed: the HTTP Interceptor now checks if the access token has to get refreshed before a request to the Spring Boot-server is made.

Official docs: https://angular.dev/guide/http/interceptors#modifying-requests

Testing Instructions

• Run application-server and webapp Use the Preview Deployment
• Login on the website
• Wait for the access token to expire (exact time can be checked via the dev tools, should be 300s)
• Make a new request, e.g. a different leaderboard, and check for failure

Checklist

General

• PR title is clear and descriptive
• PR description explains the purpose and changes
• Code follows project coding standards
• Self-review of the code has been done
• Changes have been tested locally
• Screenshots have been attached (if applicable)
• Documentation has been updated (if applicable)

[FelixTJDietrich]

Nicely done! Thank you for the help with this, really great job :)