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.

_aup_add_dataset_scope_ui.py

@@ -0,0 +1,75 @@
+from pathlib import Path
+p=Path(r'd:/Projects/Dev/ThreatHunt/frontend/src/components/AUPScanner.tsx')
+t=p.read_text(encoding='utf-8')
+
+# default selection when hunt changes: first 3 datasets instead of all
+old='''    datasets.list(0, 500, selectedHuntId).then(res => {
+      if (cancelled) return;
+      setDsList(res.datasets);
+      setSelectedDs(new Set(res.datasets.map(d => d.id)));
+    }).catch(() => {});
+'''
+new='''    datasets.list(0, 500, selectedHuntId).then(res => {
+      if (cancelled) return;
+      setDsList(res.datasets);
+      setSelectedDs(new Set(res.datasets.slice(0, 3).map(d => d.id)));
+    }).catch(() => {});
+'''
+if old not in t:
+    raise SystemExit('hunt-change dataset init block not found')
+t=t.replace(old,new)
+
+# insert dataset scope multi-select under hunt info
+anchor='''                {!selectedHuntId && (
+                  <Typography variant="caption" color="text.secondary" sx={{ mt: 0.5, display: 'block' }}>
+                    All datasets will be scanned if no hunt is selected
+                  </Typography>
+                )}
+              </Box>
+
+              {/* Theme selector */}
+'''
+insert='''                {!selectedHuntId && (
+                  <Typography variant="caption" color="text.secondary" sx={{ mt: 0.5, display: 'block' }}>
+                    Select a hunt to enable scoped scanning
+                  </Typography>
+                )}
+
+                <FormControl size="small" fullWidth sx={{ mt: 1.2 }} disabled={!selectedHuntId || dsList.length === 0}>
+                  <InputLabel id="aup-dataset-label">Datasets</InputLabel>
+                  <Select
+                    labelId="aup-dataset-label"
+                    multiple
+                    value={Array.from(selectedDs)}
+                    label="Datasets"
+                    renderValue={(selected) => `${(selected as string[]).length} selected`}
+                    onChange={(e) => setSelectedDs(new Set(e.target.value as string[]))}
+                  >
+                    {dsList.map(d => (
+                      <MenuItem key={d.id} value={d.id}>
+                        <Checkbox size="small" checked={selectedDs.has(d.id)} />
+                        <Typography variant="body2" sx={{ ml: 0.5 }}>
+                          {d.name} ({d.row_count.toLocaleString()} rows)
+                        </Typography>
+                      </MenuItem>
+                    ))}
+                  </Select>
+                </FormControl>
+
+                {selectedHuntId && dsList.length > 0 && (
+                  <Stack direction="row" spacing={1} sx={{ mt: 1 }}>
+                    <Button size="small" onClick={() => setSelectedDs(new Set(dsList.slice(0, 3).map(d => d.id)))}>Top 3</Button>
+                    <Button size="small" onClick={() => setSelectedDs(new Set(dsList.map(d => d.id)))}>All</Button>
+                    <Button size="small" onClick={() => setSelectedDs(new Set())}>Clear</Button>
+                  </Stack>
+                )}
+              </Box>
+
+              {/* Theme selector */}
+'''
+if anchor not in t:
+    raise SystemExit('dataset scope anchor not found')
+t=t.replace(anchor,insert)
+
+p.write_text(t,encoding='utf-8')
+print('added AUP dataset multi-select scoping and safer defaults')