- Invoice edit mode now uses the same form as create mode (all fields editable)
- Bank account pre-selected by matching IBAN/account number
- Invoice number read-only in edit mode
- Paid invoices remain read-only
- NAS: old PDF deleted when invoice date changes to different month
- Buttons: Zobrazit fakturu, Uložit, Smazat + status transitions
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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