Fix the error handling(messaging) and the way remote requests are made to the backend API

[ParrotStone]

Add code to support the UI when the backend API either crashes, or respond with an error not planned for(unexpected error).

Here are some snippets of code as a starter guides

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TODOs:

• Configure the request headers to always send the Authorization header when the user is logged in to the backend API with every call.
• Configure the front-end to store the access/refresh tokens securely out of the local storage to avoid XSS attacks

[ParrotStone]

Additional code snippet

[ParrotStone]

Completed the part about sending the Authorization header automatically with every request after the auth process.
The UI can handle crashes at the back-end API but still needs more testing.