- Detect markdown tables and render with Unicode box-drawing characters
- Calculate visual terminal width for CJK/emoji (2 cols) vs ASCII (1 col)
- Wrap long cells across multiple lines, prefer word-boundary breaks
- Allocate column widths: narrow columns (#, status, count, date) minimal,
  content columns kept >= 12 chars
- Render tables with <Text wrap="truncate-end"> to prevent Ink from
  breaking box-drawing lines at cell boundary spaces
- Expose renderMarkdownSegments() for per-segment wrapping control

…row to fill terminal

Replace the aggressive maxLine/1.5 ideal-width heuristic with full natural
widths. When the total fits within the available terminal width (defaulting
to 120 cols), distribute slack proportionally to content columns instead of
leaving them cramped. Detect narrow label columns by actual content width
(≤8 chars) rather than hardcoded position ([0, 1, -2, -1]). When compression
is necessary, start from per-column minimums (longest word) and share the
remaining budget proportionally based on each column's deficit.

This fixes the "tables too narrow and too tall" issue reported on PR lessweb#115
where every column was forced to ~67% of its natural width regardless of
available screen real estate.

…width handling