New Feature: Introduce Upcoming page to Mihon

[sirlag]

Draft Notes

• This feature probably still requires some tweaking to the smart updates estimates / what is shown. Currently, ongoing manga that are effectively finished or on hiatus but not marked as such will still display (and register with smart updates), sometimes with rather short estimates.
• This is my first major contribution to Mihon, I am almost certain I missed something, code review / change requests are appreciated.
• Possibly tweak the list items further

Features

• Adds new "Upcoming" screen which will allow users to see what manga may be releasing in the near future, powered by the smart updates system.
• Displays upcoming updates in both a calendar and list view.

Interactions

• Open the Upcoming screen by pressing the calendar in the app bar of the Updates tab
• Exit the screen through the back button or system gestures
• The question mark in the top right will open a help guide to explain the smart updates system / what is actually being shown
  • If this feature is planned to be merged, I will write the copy for this and make a matching PR to the web repo.
• Touching a given manga will open the associated manga library entry
• Touching a date on the calendar with fast scroll to updates planned for that day, if there are any present.

Screenshots

Update Tab	Upcoming Screen

Horizontal Extended View	Vertical Extended View

Horizontal Tablet UI	Vertical Tablet UI

Video Demo: https://github.com/mihonapp/mihon/assets/1882979/6945a4dc-c987-418d-9d70-c7bcefe1c9e6

[sirlag]

Updated the tablet view as well as provided tablet specific screenshots. There is space for two months side by side on the horizontal tablet view, but I was having difficulty getting the page to behave as wanted.

[AntsyLich]

Maybe for tablet view have calendar and list side by side? similar to the manga details screen where info is on one side and chapter list on other. we have a component for this 2 sided behavior so check that out