feat(ui): swipe up and down to switch between articles

[JunkFood02]

This is a large PR so I'll try be concise

Done

• Refactor the reading page (again ^^;)
• Use a NestedScrollConnection to receive scroll events from the LazyColumn, and build up a PullToLoadState for handling offset and callbacks (Thanks [RFC] Swipe ReadingPage #468 by @boun for inspiration!)
• Use offset to animate the article view. Add a new, cute component PullToLoadIndicator
• Use NestedScrollConnection to calculate isReaderScrollingDown instead of LazyListState because it's more accurate

To do

• The behavior when there's no next/previous article are not defined or implemented yet
• Write documents for dirty works if we want to make this feature maintainable

Screen record:

2024-02-06.20.00.50.mp4

[nvllz]

This one is massive... man!
I like it. Works great with "All/Starred" flows, but it's a little buggy with "Unread". I have to mark articles as unread to trigger the next article in the list. Sometimes it seems to work seamlessly when parsing full article content, but it's still missing some of my gestures.

e1864dab-8191-41c7-a889-3baed4069e07.mp4

I hope it's some kind of hint. Cheers!

[JunkFood02]

@nvllz Thanks! This feature is not ready for use so far, as the one in the To do:

• The behavior when there's no next/previous article are not defined or implemented yet

The problem you encounter is actually because, when you open an article within the Unread filter, it'll be immediately removed from the article list. Then there's no way to find the previous/next article for an item which doesn't even exist in the list.

This PR was merged into main because we find it difficult to maintain two branches. I'll let you know if we have progress on this feature 🤞