umputun / revdiff / 24951627328

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feat(ui): vertical scrollbar thumb on navigation pane right border (#152)

* feat(ui): add navigation pane scrollbar thumb

* test(ui): cover navigation scrollbar edge cases and ScrollState

Add direct unit tests for FileTree.ScrollState and TOC.ScrollState
(including the activeSection-driven offset path used when diff has
focus). Extend TestApplyNavigationScrollbar with vh=1, overscrolled
offset, empty input, proportional thumb sizing, and the
unexpected-line-count bail. Add paneDiff-focus regression for the
navigation thumb to cover the inactive-border ANSI envelope.

Document scrollbarSpec field semantics, point applyScrollbar /
applyNavigationScrollbar wrappers at applyPaneScrollbar's contract,
and name the ScrollState freshness precondition. Update
ARCHITECTURE.md interface method counts (15->17, 7->9) for the new
ScrollState method on FileTreeComponent / TOCComponent.

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