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Enables visible signature appearances in pdfcraft_sign to render Unicode characters (specifically Latin Extended-A / Central European characters such as č, ć, ž, š, đ) by embedding the bundled Inter-Regular.ttf font with /Identity-H encoding and a /ToUnicode CMap when the signer name, labels, reason, or location contain non-WinAnsi text. When all text is within WinAnsiEncoding, the existing zero-byte overhead behavior (using standard /Helv) is preserved. Closes #2207