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fix: report the real error when a Windows G-code export fails copy_file built its failure message as "Error: " + errCode. Adding a DWORD to a string literal is pointer arithmetic, not concatenation, so the pointer lands errCode bytes into an 8-byte literal and runs past its end for any code above 7. std::string then calls strlen on it and throws length_error, and the catch(...) in BackgroundSlicingProcess::finalize_gcode replaces the diagnosis with "Unknown error occurred during exporting G-code." Every code a user is likely to hit is past the end: write-protected media is 19, no media 21, a full disk 112, and a destination held open by another program 32. Codes 1 to 7 stay inside the literal and produce a truncated message instead. So the "Maybe the SD card is write locked?" text has not been reachable on Windows since this path was added in #2923. Now that it is reachable, that guess only fits removable media, so it is conditional on m_export_path_on_removable_media. The existing string is untouched and keeps its 23 translations; the fixed-drive case adds one string.
OrcaSlicer tests
Building, running and writing tests is documented on the wiki, under How to Test.
Two files here rather than there, because coding agents only read what is in the repository: