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.

_patch_inventory_stats2.py

@@ -0,0 +1,10 @@
+from pathlib import Path
+p=Path(r'd:/Projects/Dev/ThreatHunt/backend/app/services/host_inventory.py')
+t=p.read_text(encoding='utf-8')
+needle='            "hosts_with_users": sum(1 for h in host_list if h[\'users\']),\n'
+if '"row_budget_per_dataset"' not in t:
+    if needle not in t:
+        raise SystemExit('needle not found')
+    t=t.replace(needle, needle + '            "row_budget_per_dataset": settings.NETWORK_INVENTORY_MAX_ROWS_PER_DATASET,\n            "sampled_mode": settings.NETWORK_INVENTORY_MAX_ROWS_PER_DATASET > 0,\n')
+p.write_text(t,encoding='utf-8')
+print('inserted inventory budget stats lines')