Settings tab reorganized into 3 sections:
- Appearance & Defaults: welcome message + output formats + Save
- Privacy & Data: privacy mode toggle + manual purge
- Security: change password
Manual purge fix:
- purge_all=True clears ALL completed/failed jobs regardless of age
- Previously only cleared jobs older than max_age_hours (7 days),
so recent downloads were never purged on manual trigger
SSE broadcast for purge:
- Added SSEBroker.publish_all() for cross-session broadcasts
- Purge endpoint sends job_removed events for each deleted job
- Frontend queue clears in real-time when admin purges