[Feature Request] Seamless chapter preloading in DIVINA webtoon/vertical scroll mode

[Jampard]

Description

When reading in DIVINA webtoon/vertical scroll mode, reaching the end of a chapter requires an additional scroll gesture to trigger loading the next chapter. This creates a noticeable interruption in the reading flow.

Expected behavior

The next chapter is preloaded and stitched into the scroll view as the reader approaches the end of the current chapter — creating a continuous, seamless scroll experience across chapter boundaries. This is how Tachiyomi/Mihon handles webtoon reading and it's a much smoother experience for long-strip manga.

Current behavior

Scrolling to the end of a chapter hits a boundary. The reader then requires another scroll/swipe gesture to load the next chapter (via the boundary swipe handling in #505). There's a visible loading pause between chapters.

Context

• Applies to DIVINA reader in webtoon/vertical scroll mode
• Related to boundary handling in fix: unify boundary swipe handling in divina reader #505, but this is about eliminating the boundary entirely for a continuous scroll experience
• Common pattern in manga readers: preload N pages of the next chapter and append them to the scroll view before the user reaches the end

[Jampard]

Works great!!!
Thanks so much @everpcpc , having a blast with this app.