Fixes from code review:
- Fix duplicate check in merge logic (use else clause)
- Handle io.EOF gracefully (treat as quit)
- Add quit (q) option to abort resolution early
- Add accept-all (a) option to auto-merge remaining conflicts
- Fix skipped conflicts to keep local version (not auto-merge)
- Handle json.MarshalIndent errors properly
- Fix truncateText to use rune count for UTF-8 safety
- Update help text with new options
- Add UTF-8 and emoji test cases
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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