Modernize the week view design

[Tandonnet]

Checklist

• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the request will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.

Feature description

Change the design of the week view to better match the other views. For example, everywhere, events has rounded corners, except for the week view where everything is rectangular.

Why do you want this feature?

I mostly use the week view when using the calendar, and the design feels outdated compared to everything else.

Additional information

Here is an example of the differences I'm talking about.
This is the montly view :

And this is the weekly view :