When the poll request fails (e.g. job not found 404), clear the activeJob
state and stop the interval instead of endlessly retrying. Also refresh
the KB detail to get the current state.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Frontend: only treat parsing_documents/distilling as actively running;
pending jobs older than 2 minutes are ignored as stale
- Backend: add fail_stale_jobs() that marks pending/active jobs older than
5 minutes as failed before checking for active jobs in trigger_processing
- Prevents UI from getting stuck on old jobs that never completed
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>