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.

_perf_patch_backend.py

@@ -0,0 +1,107 @@
+from pathlib import Path
+# config updates
+cfg=Path(r'd:/Projects/Dev/ThreatHunt/backend/app/config.py')
+t=cfg.read_text(encoding='utf-8')
+anchor='''    NETWORK_SUBGRAPH_MAX_EDGES: int = Field(
+        default=3000, description="Hard cap for edges returned by network subgraph endpoint"
+    )
+'''
+ins='''    NETWORK_SUBGRAPH_MAX_EDGES: int = Field(
+        default=3000, description="Hard cap for edges returned by network subgraph endpoint"
+    )
+    NETWORK_INVENTORY_MAX_ROWS_PER_DATASET: int = Field(
+        default=200000,
+        description="Row budget per dataset when building host inventory (0 = unlimited)",
+    )
+'''
+if 'NETWORK_INVENTORY_MAX_ROWS_PER_DATASET' not in t:
+    if anchor not in t:
+        raise SystemExit('config network anchor not found')
+    t=t.replace(anchor,ins)
+cfg.write_text(t,encoding='utf-8')
+
+# host inventory updates
+p=Path(r'd:/Projects/Dev/ThreatHunt/backend/app/services/host_inventory.py')
+t=p.read_text(encoding='utf-8')
+if 'from app.config import settings' not in t:
+    t=t.replace('from app.db.models import Dataset, DatasetRow\n', 'from app.db.models import Dataset, DatasetRow\nfrom app.config import settings\n')
+
+t=t.replace('        batch_size = 5000\n        last_row_index = -1\n        while True:\n', '        batch_size = 10000\n        max_rows_per_dataset = max(0, int(settings.NETWORK_INVENTORY_MAX_ROWS_PER_DATASET))\n        rows_scanned_this_dataset = 0\n        sampled_dataset = False\n        last_row_index = -1\n        while True:\n')
+
+old='''            for ro in rows:
+                data = ro.data or {}
+                total_rows += 1
+
+                fqdn = ''
+'''
+new='''            for ro in rows:
+                if max_rows_per_dataset and rows_scanned_this_dataset >= max_rows_per_dataset:
+                    sampled_dataset = True
+                    break
+
+                data = ro.data or {}
+                total_rows += 1
+                rows_scanned_this_dataset += 1
+
+                fqdn = ''
+'''
+if old not in t:
+    raise SystemExit('row loop anchor not found')
+t=t.replace(old,new)
+
+old2='''            last_row_index = rows[-1].row_index
+            if len(rows) < batch_size:
+                break
+'''
+new2='''            if sampled_dataset:
+                logger.info(
+                    "Host inventory row budget reached for dataset %s (%d rows)",
+                    ds.id,
+                    rows_scanned_this_dataset,
+                )
+                break
+
+            last_row_index = rows[-1].row_index
+            if len(rows) < batch_size:
+                break
+'''
+if old2 not in t:
+    raise SystemExit('batch loop end anchor not found')
+t=t.replace(old2,new2)
+
+old3='''    return {
+        "hosts": host_list,
+        "connections": conn_list,
+        "stats": {
+            "total_hosts": len(host_list),
+            "total_datasets_scanned": len(all_datasets),
+            "datasets_with_hosts": ds_with_hosts,
+            "total_rows_scanned": total_rows,
+            "hosts_with_ips": sum(1 for h in host_list if h['ips']),
+            "hosts_with_users": sum(1 for h in host_list if h['users']),
+        },
+    }
+'''
+new3='''    sampled = settings.NETWORK_INVENTORY_MAX_ROWS_PER_DATASET > 0
+
+    return {
+        "hosts": host_list,
+        "connections": conn_list,
+        "stats": {
+            "total_hosts": len(host_list),
+            "total_datasets_scanned": len(all_datasets),
+            "datasets_with_hosts": ds_with_hosts,
+            "total_rows_scanned": total_rows,
+            "hosts_with_ips": sum(1 for h in host_list if h['ips']),
+            "hosts_with_users": sum(1 for h in host_list if h['users']),
+            "row_budget_per_dataset": settings.NETWORK_INVENTORY_MAX_ROWS_PER_DATASET,
+            "sampled_mode": sampled,
+        },
+    }
+'''
+if old3 not in t:
+    raise SystemExit('return stats anchor not found')
+t=t.replace(old3,new3)
+
+p.write_text(t,encoding='utf-8')
+print('patched config + host inventory row budget')