feat(config): make wheel scrolling configurable

[benvinegar]

Summary

• add a user-only wheel_scroll_lines preference accepting "auto" or a fixed 1–10 rows per wheel event
• add --wheel-scroll-lines as a launch-scoped override for review commands
• preserve the existing cadence-based 1→3 row acceleration in auto mode while making numeric values exact and predictable
• document the option, add a patch changeset, and cover config, CLI, helper, bootstrap, and real PTY behavior

Example

# ~/.config/hunk/config.toml
wheel_scroll_lines = 3

hunk diff --wheel-scroll-lines 3

Repository config intentionally cannot set this machine-local input preference.

Testing

• bun run typecheck
• bun run lint
• bun run format:check
• bun run check:docs
• bun run deps:check
• bun run test
• bun run test:integration — 133 passed, 1 platform skip
• bun run test:tty-smoke — 9 passed
• source invocation in a real PTY against a two-file diff with --wheel-scroll-lines 3

This PR description was generated by Pi using OpenAI GPT-5.6 Sol

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Project	Deployment	Actions	Updated (UTC)
hunk-web	Ready	Preview	Aug 25, 2026 10:10pm