Config: soft wrap long diff lines

[carsonjones]

Summary

Adds opt-in soft wrapping of long diff lines via "wrap": true in ~/.config/comview/config.json (builds on #7).

• Long lines fold at the terminal edge instead of requiring horizontal scroll
• Horizontal scrollbar is hidden in wrap mode
• Scroll, cursor visibility, and maxScroll accounting are all wrap-aware
• Side-by-side mode is unaffected

How it works

• wrappedDocRowHeight(docRow, viewportWidth) computes screen rows needed per doc row
• printRowWrapped paints the gutter + first chunk on the first screen row, then continuation chunks on subsequent rows with background fill
• rowDisplayHeightForSize, screenRowForDocRow, totalDisplayRowsForSize, and maxScrollForVisibleRows all use wrapped heights so scrolling stays accurate
• scrollbarVisibility suppresses the horizontal scrollbar and uses total wrapped row count for the vertical scrollbar

Example config

{
  "wrap": true
}

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