xlnt-community / xlnt / 0281c3fa-b4ad-46dd-b110-a792c510831a

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Fix cell::value / format when copying between different workbooks (#124)

`cell::value(const cell)` now detects cross-workbook copies and:
 - Remaps shared_string values into the destination workbook’s shared
string table.
 - Copies formulas as text.
 - Copies external hyperlinks; internal hyperlinks (cell/range
references) are not yet implemented.
 - Deep-copies the source cell format into the destination workbook.

`cell::format(const format)` now:
 - Checks if the format belongs to the current workbook.
 - If not, clones all format properties into this workbook’s stylesheet
using only the public API, avoiding foreign pointers.
 - Associates the style by name if present; deep-cloning of style
content is not yet implemented (documented as a temporary limitation).
 - Within the same workbook, behavior remains unchanged (fast shallow
copy).

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