Add extra vertical space to every buffer line (LINE_SPACING_EXTRA, 30% of font size) on top of the font natural line height. The same style measures and draws rows so whole-line snapping stays in step.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JW57ZwRSygeowNBguQEUUB
