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.

_edit_main_reconcile.py

@@ -0,0 +1,31 @@
+from pathlib import Path
+p=Path(r'd:/Projects/Dev/ThreatHunt/backend/app/main.py')
+t=p.read_text(encoding='utf-8')
+old='''    # Start job queue
+    from app.services.job_queue import job_queue, register_all_handlers, JobType
+    register_all_handlers()
+    await job_queue.start()
+    logger.info("Job queue started (%d workers)", job_queue._max_workers)
+'''
+new='''    # Start job queue
+    from app.services.job_queue import (
+        job_queue,
+        register_all_handlers,
+        reconcile_stale_processing_tasks,
+        JobType,
+    )
+
+    if settings.STARTUP_RECONCILE_STALE_TASKS:
+        reconciled = await reconcile_stale_processing_tasks()
+        if reconciled:
+            logger.info("Startup reconciliation marked %d stale tasks", reconciled)
+
+    register_all_handlers()
+    await job_queue.start()
+    logger.info("Job queue started (%d workers)", job_queue._max_workers)
+'''
+if old not in t:
+    raise SystemExit('startup queue block not found')
+t=t.replace(old,new)
+p.write_text(t,encoding='utf-8')
+print('wired startup reconciliation in main lifespan')