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The new worker's surname was misheard: Kropáček → Kópáček everywhere (default data, both Excel templates, export rosters). The person id tkb-kropacek is kept. The server now normalises the name in stored files at startup and in every incoming save, so clients that still hold the old name cannot write it back. "O" (otcovská dovolená) is now rendered in the same yellow as "D" in the app and the month Excel, labelled "Otcovská dovolená", and for the FPD balance a working-day O is credited like N (a normal worked day) both in the web FPD check and in the month Excel's FPD column, which previously counted N and O as zero and disagreed with the web. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>