fix: stabilize divina scroll navigation

[everpcpc]

Problem

DIVINA scroll mode could get into a bad navigation state after fast tap-zone page turns. If programmatic page turns were interrupted or followed by a swipe, the reader could keep stale scroll targets alive, making page turns stall and increasing the chance of jumping back when the view refreshed.

Approach

Treat the active programmatic page turn as first-class reader state instead of inferring it from the last committed item. Queued reloads now prefer the active target, user drags explicitly cancel stale programmatic navigation, and the scroll coordinator only settles a programmatic turn once the target offset is actually reached.

Scope

• Stabilize ScrollReaderEngine target tracking for queued reloads
• Fix iOS DIVINA scroll handoff between tap-zone turns and swipe gestures
• Keep deferred viewport restoration from snapping back to outdated anchors
• Bump CURRENT_PROJECT_VERSION to 368

Validation

• make format
• make build-ios