umputun / revdiff / 34504073018

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feat(keymap): add page-sized scroll_diff actions (#357)

J/K scroll the diff viewport from either pane but only by a wheel step,
while pgdown/pgup and ctrl+d/ctrl+u stay pane-relative — with the tree
focused they page the tree, so skimming a file means tabbing into the
diff and back.

Add scroll_diff_page_down/up and scroll_diff_half_page_down/up, the
page-sized siblings of scroll_diff_down/up. Dispatched in both
handleTreeAction (inside the early-return switch, ahead of the mdTOC
branch, so tree and TOC selection stay put) and handleDiffMovement, so a
globally mapped key does not go dead when focus moves to the diff.

They ship with no default binding: pgdown/pgup and ctrl+d/ctrl+u are the
only keys that page the file tree and the markdown TOC, and repointing
them would take that away. Bind them to get lazygit-style paging.

Full-page uses pageRows() and so honors --page-overlap; half-page uses
the new halfPageRows() and does not, matching the rule the cursor-motion
half-page keys already follow.

Related to #357

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