Add Markdown reference generation and interactive browser with word wrapping

- Add --md flag for interactive filtered document browser: displays all
  command/subcommand help as a scrollable document, typing filters to
  show only sections whose content matches
- Add --md-file <path> to write a Markdown reference file with definition
  lists and option category headings
- Add TuiWrapLines() for ANSI-aware word wrapping with indent-preserving
  continuation lines; used by TuiPager and the markdown browser
- TuiPager now word-wraps instead of truncating, re-wraps on resize
- Extend TuiPickOne with optional SearchTexts span for filtering against
  auxiliary content instead of display labels
- Replace std::fstream/sstream with fmt string building and IoBuffer/WriteFile

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