The New-job dialog seeded the output prefix from QFileInfo::completeBaseName(),
which drops the directory, so _process.h5/.cif/.mtz landed in the viewer's
working directory (wherever it was installed) instead of beside the dataset.
Seed it with the input file's absolute directory instead; the field stays
editable. Relies on the trusted output-path support so the absolute prefix is
accepted by the writer.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>