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.

_enforce_scanner_budget.py

@@ -0,0 +1,55 @@
+from pathlib import Path
+p=Path(r'd:/Projects/Dev/ThreatHunt/backend/app/services/scanner.py')
+t=p.read_text(encoding='utf-8')
+if 'from app.config import settings' not in t:
+    t=t.replace('from sqlalchemy.ext.asyncio import AsyncSession\n','from sqlalchemy.ext.asyncio import AsyncSession\n\nfrom app.config import settings\n')
+
+old='''        import asyncio
+
+        for ds_id, ds_name in ds_map.items():
+            last_id = 0
+            while True:
+'''
+new='''        import asyncio
+
+        max_rows = max(0, int(settings.SCANNER_MAX_ROWS_PER_SCAN))
+        budget_reached = False
+
+        for ds_id, ds_name in ds_map.items():
+            if max_rows and result.rows_scanned >= max_rows:
+                budget_reached = True
+                break
+
+            last_id = 0
+            while True:
+                if max_rows and result.rows_scanned >= max_rows:
+                    budget_reached = True
+                    break
+'''
+if old not in t:
+    raise SystemExit('scanner loop block not found')
+t=t.replace(old,new)
+
+old2='''                if len(rows) < BATCH_SIZE:
+                    break
+
+'''
+new2='''                if len(rows) < BATCH_SIZE:
+                    break
+
+            if budget_reached:
+                break
+
+        if budget_reached:
+            logger.warning(
+                "AUP scan row budget reached (%d rows). Returning partial results.",
+                result.rows_scanned,
+            )
+
+'''
+if old2 not in t:
+    raise SystemExit('scanner break block not found')
+t=t.replace(old2,new2,1)
+
+p.write_text(t,encoding='utf-8')
+print('added scanner global row budget enforcement')