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fix: make ctrl+d/u scroll half-page instead of full page (#25)

* feat: split ctrl+d/u from PgDn/PgUp for half-page scrolling

ctrl+d/u now scroll half a page in diff, tree, and TOC panes,
matching vim convention. PgDn/PgUp remain full-page scroll.

* docs: verify documentation for half-page scroll feature

* fix: address code review findings

- Update README.md and usage.md: ctrl+d/u described as "Half-page scroll" instead of "Page scroll"
- Add changelog entry for half-page scroll fix
- Add missing ctrl+u test case in TestModel_TreeCtrlDUMovesHalfPage

* move completed plan: 2026-04-05-half-page-scroll.md

* chore: remove completed plan file

* revert: remove changelog entry (maintainer responsibility)

* fix: scroll viewport explicitly on ctrl+d/u half-page movement

Replace syncViewportToCursor() with explicit YOffset adjustment
so viewport scrolls by half page simultaneously with cursor,
matching vim/less ctrl+d/u behavior.

Add viewport.YOffset assertions to half-page tests.

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