[Feature request] Improve UX Consistency in Spine Navigation

[erkasraim]

AS-IS

• When swiping left or right between spines, the transition uses setCurrentItem(position, true) with an automatic animation. This feels different from swiping inside a spine, so the UX is inconsistent.
• In scroll mode, moving between spines is done with left/right swipes instead of vertical scrolling, which makes the UX inconsistent.

TO-BE

• By using ViewPager2, the UX for moving between spines and navigating inside a spine can be unified.
• In swipe mode, both inter-spine navigation and intra-spine navigation will share the same swipe-based UX.
• In scroll mode, inter-spine navigation will be implemented with vertical scrolling only, ensuring a consistent UX.
• Improve UX Consistency in Spine Navigation #701

[erkasraim]

Changed Swipe Mode UX

output2.webm

Changed Scroll Mode UX

output.webm