The source name typed during configuration was saved, but the next import
looks the source and its imported files up by the subfolder name, so a
renamed source looked new: format guessed again, every file pre-checked,
and a second source created under the folder name.
The name field becomes a read-only SourceNameDisplay showing the subfolder
name with a hint, and executeImport writes selectedSource.folder_name on
create and update, whatever config.name holds, behind a selectedSource
guard. The import card sentence no longer asks to check the source name.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
