Add an option to hide some courses. This can be useful when courses aren't relevant, eg. because they are from a different semester, they were already taken (and in these specific cases we might want to hide them automatically), or because the student will take the exam in another semester.

It seems the access token is not valid anymore after a file download is performed (from the Material section).
The issue seems to arise only when restarting the app. Downloading multiple files works, as does opening the webmail after downloading files.

Unsure if this is because a new API key must be used after a file download, or if this is an error from the API, or if the token gets somehow mutated/deleted after a file download.

Status bar text color doesn't change to light/dark modes according to status bar background color.

I'm not sure if the UI should be presented as "limit searches to this course" or "search in this course [that you just opened]"

Sometimes icons and text appear misaligned or in multiple rows.

Implement a request limiter for each request type in order to allow same requests only after some defined time. This is to prevent overloading the servers, especially when fetching data that doesn't update often.

Update the material processing functions to serialize Date objects

Rewrite data handling logic (re-think Redux and React's Context API usage) in a way that is easier to manage and less bug-prone.
Structure of the new data logic should also take into account issues #39 and #40, which shall be immediately implemented after this issue is resolved.

It could be interesting to have home screen widgets, eg. upcoming lessons, upcoming bookings, recent materials, or recent notifications. Note that this can't be done directly in react native.

Have widgets in the main screen of the app.

Might be connected to issue #47.

Use dark/light mode according to system theme.

In the course tab, in overview there are some tabs such as material and alert that need to show a text when there is no content available, otherwise it appears a bug.

"All exams", "Booked", "Available to book".

The user should know where the folder where files are stored is located. Similarly, it should be clear how to delete files or select multiple files, or the use, and the existence thereof, of other future features of this page. Add a help button.

Main points:

• Create a courses page
• Create a page for viewing course details

Users should be able to select multiple files, or a whole folder, and be able to download/remove files in bulk.

Main points:

• The app will store the material tree for offline viewing
• Downloaded files will be usable as usual
• Non-downloaded files will be grayed-out and the download icon will be replaced by an offline indicator
• This enhancement requires implementation of online/offline detection.

Create a page for viewing all exams.

Title. If many course names are long (eg. "System and device programming", "Data science and database technology", "Architetture dei sistemi di elaborazione), it takes a lot of scrolling to browse to different courses in the materials page. Perhaps the UI should feature a vertical list of courses somehow.

Main points:

• File downloads should be handled in-app, with a notification informing the user on the download progress
• After download is complete, the download icon will be replaced by another icon (checkmark or "remove" icon)
• Clicking on said icon will ask the user whether they want to remove the file. File will be kept or deleted according to choice.

Material file icons are computed based on the variable nome, but should be determined from filename.