- Implements sequential job queue with background worker thread (_enqueue_job, _queue_worker)
- All generate routes now return job_id instead of prompt_id; frontend polls /api/queue/<id>/status
- Queue management UI in navbar with live badge, job list, pause/resume/remove controls
- Fix: replaced url_for() calls inside finalize callbacks with direct string paths (url_for raises RuntimeError without request context in background threads)
- Batch cover generation now uses two-phase pattern: queue all jobs upfront, then poll concurrently via Promise.all so page navigation doesn't interrupt the process
- Strengths gallery sweep migrated to same two-phase pattern; sgStop() cancels queued jobs server-side
- LoRA weight randomisation via lora_weight_min/lora_weight_max already present in _resolve_lora_weight
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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