Different appearance for tentative / confirmed and busy / free events

[christian179717]

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 bug report will be dismissed otherwise.
• This issue contains only one feature request.
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Feature description

Latest it's not possible to see at the first moment if an event is tentative or confirmed, and if you are busy or free at that moment.
Thunderbird realizes it with a white border for free and no border for busy events and lighter colors for tentative events.

Why do you want this feature?

With that you can see immediately if you are available at the specific point of time without opening the event and checking it there.

Additional information

No response