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.

_harden_aup_scope_ui.py

@@ -0,0 +1,71 @@
+from pathlib import Path
+p=Path(r'd:/Projects/Dev/ThreatHunt/frontend/src/components/AUPScanner.tsx')
+t=p.read_text(encoding='utf-8')
+
+# Auto-select first hunt with datasets after load
+old='''      const [tRes, hRes] = await Promise.all([
+        keywords.listThemes(),
+        hunts.list(0, 200),
+      ]);
+      setThemes(tRes.themes);
+      setHuntList(hRes.hunts);
+'''
+new='''      const [tRes, hRes] = await Promise.all([
+        keywords.listThemes(),
+        hunts.list(0, 200),
+      ]);
+      setThemes(tRes.themes);
+      setHuntList(hRes.hunts);
+      if (!selectedHuntId && hRes.hunts.length > 0) {
+        const best = hRes.hunts.find(h => h.dataset_count > 0) || hRes.hunts[0];
+        setSelectedHuntId(best.id);
+      }
+'''
+if old not in t:
+    raise SystemExit('loadData block not found')
+t=t.replace(old,new)
+
+# Guard runScan
+old2='''  const runScan = useCallback(async () => {
+    setScanning(true);
+    setScanResult(null);
+    try {
+'''
+new2='''  const runScan = useCallback(async () => {
+    if (!selectedHuntId) {
+      enqueueSnackbar('Please select a hunt before running AUP scan', { variant: 'warning' });
+      return;
+    }
+    if (selectedDs.size === 0) {
+      enqueueSnackbar('No datasets selected for this hunt', { variant: 'warning' });
+      return;
+    }
+
+    setScanning(true);
+    setScanResult(null);
+    try {
+'''
+if old2 not in t:
+    raise SystemExit('runScan header not found')
+t=t.replace(old2,new2)
+
+# update loadData deps
+old3='''  }, [enqueueSnackbar]);
+'''
+new3='''  }, [enqueueSnackbar, selectedHuntId]);
+'''
+if old3 not in t:
+    raise SystemExit('loadData deps not found')
+t=t.replace(old3,new3,1)
+
+# disable button if no hunt or no datasets
+old4='''                  onClick={runScan} disabled={scanning}
+'''
+new4='''                  onClick={runScan} disabled={scanning || !selectedHuntId || selectedDs.size === 0}
+'''
+if old4 not in t:
+    raise SystemExit('scan button props not found')
+t=t.replace(old4,new4)
+
+p.write_text(t,encoding='utf-8')
+print('hardened AUPScanner to require explicit hunt/dataset scope')