When searching in the Takings view, entering a plain Sale ID (like '123')
did not return any results. The search only worked with customer names
or with the 'POS 123' format.
The issue was that is_valid_receipt() only recognized 'POS ####' format
or invoice numbers, so plain numeric Sale IDs fell through to the
customer name search branch which doesn't search sale_id.
This fix adds sale_id to the search conditions when the search term is
numeric (ctype_digit check), allowing direct Sale ID searches.
Fixes#4567
Co-authored-by: Ollama <ollama@steganos.dev>
4173d7f350