feat: Show the current week instead of today + 7 days in meal planner

[simon-zumbrunnen]

What this PR does / why we need it:

The meal planner currently shows the next 7 days. With this pull request I propose to change this behaviour so the default is a weekly overview similar to how calendars usually work. The default setting for the time range is changed so it starts at the most recent "start of the week" according to the settings.

If this pull request is accepted I plan to implement buttons to get to the previous / next week.

Which issue(s) this PR fixes:

This does not directly fix any open issue but it is a step towards weekly shopping lists discussed in #1899.

[boc-the-git]

The concept sounds like it would be a significant regression on my own UX. So if this is to become the default, I think you need to implement a lot of configurability.
It's uncommon to need to look at the history in the meal planner, and current functionality allows a user to set how many future days to include (I have it set to 12, FWIW).

[DenuxPlays]

Just a small Note:

Wouldnt it be possible to let the user define their own schedule?

So in my case I plan from thursday to thursday.

[Kuchenpirat]

The most flexible solution would probably to have a checkbox that can be enabled disabled that toggles a start day.
This should enable a dropdown menu where the user can choose the day the week should start with. This would offer flexibility for half of the world where the start of the week is not monday.

[simon-zumbrunnen]

@boc-the-git It is also uncommon to need to look at what meetings you had yesterday. But still every calendar app shows you the whole week. But yes, usually you have the option to see a single day, a week or a month. But yes, an option to choose whether to start at today or at the start of the week could make sense? Would this option make sense as a global setting or in this calendar dropdown?

@DenuxPlays This would already be possible by setting the start of the week to thursday. I don't know what other consequences this would bring though.

[simon-zumbrunnen]

@Kuchenpirat Somehow your comment was not yet there when I wrote my text. There is already the option to configure what day is the start of the week. In my code I already take this into account (household.value?.preferences?.firstDayOfWeek).

[Kuchenpirat]

Ah, yeah, I forgot about that option.
Then it would be just a toggle to enable start with the first day of the week.