feat: Add Playbook Manager, Saved Searches, and Timeline View components

- Implemented PlaybookManager for creating and managing investigation playbooks with templates.
- Added SavedSearches component for managing bookmarked queries and recurring scans.
- Introduced TimelineView for visualizing forensic event timelines with zoomable charts.
- Enhanced backend processing with auto-queued jobs for dataset uploads and improved database concurrency.
- Updated frontend components for better user experience and performance optimizations.
- Documented changes in update log for future reference.

backend/app/api/routes/analysis.py

@@ -381,6 +381,10 @@ async def submit_job(
             detail=f"Invalid job_type: {job_type}. Valid: {[t.value for t in JobType]}",
         )
 
+    if not job_queue.can_accept():
+        raise HTTPException(status_code=429, detail="Job queue is busy. Retry shortly.")
+    if not job_queue.can_accept():
+        raise HTTPException(status_code=429, detail="Job queue is busy. Retry shortly.")
     job = job_queue.submit(jt, **params)
     return {"job_id": job.id, "status": job.status.value, "job_type": job_type}