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_config_reconcile.py

@@ -0,0 +1,20 @@
+from pathlib import Path
+p=Path(r'd:/Projects/Dev/ThreatHunt/backend/app/config.py')
+t=p.read_text(encoding='utf-8')
+anchor='''    STARTUP_REPROCESS_MAX_DATASETS: int = Field(
+        default=25, description="Max unprocessed datasets to enqueue at startup"
+    )
+'''
+insert='''    STARTUP_REPROCESS_MAX_DATASETS: int = Field(
+        default=25, description="Max unprocessed datasets to enqueue at startup"
+    )
+    STARTUP_RECONCILE_STALE_TASKS: bool = Field(
+        default=True,
+        description="Mark stale queued/running processing tasks as failed on startup",
+    )
+'''
+if anchor not in t:
+    raise SystemExit('startup anchor not found')
+t=t.replace(anchor,insert)
+p.write_text(t,encoding='utf-8')
+print('updated config with STARTUP_RECONCILE_STALE_TASKS')