fixes #206 - fix silent truncation of narrow types#210
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When converting CSV cell values to signed char, unsigned char, short, or unsigned short, std::stoi returns an int which is then silently truncated via static_cast. For example, "256" read as unsigned char silently becomes 0, and "32768" read as short becomes -32768. Add range checks against std::numeric_limits before the static_cast, throwing std::out_of_range when the value does not fit. Add test104 to verify range checking for all four narrow integer types.
fixes silent integer truncation for narrow types in Converter
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Original PR in #207 by @MarkLee131.