This commit introduces a recovery mechanism to regenerate `oneliner.txt`
files for cases where transcription was successful but the oneliner
generation failed due to a crash between writing the transcript and the
oneliner.
The `transcribe::recovery::regenerate_missing_oneliners` function is
added and called at startup after `scan_and_enqueue`. This function
identifies cases with non-empty transcripts but missing oneliners and
triggers their regeneration.
The `transcribe::worker::update_oneliner` function is refactored to
always regenerate the oneliner from all available transcripts in a case,
ensuring that later recordings can correct earlier ones. This replaces
the previous `ensure_oneliner` logic which only generated the oneliner
if it didn't exist.
New helper functions `cases_needing_oneliner` and
`all_transcripts_joined` are introduced to support these changes.
Comprehensive unit tests are included for the new recovery and file
processing logic.
Brummel
b1a8186fcd