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_test_api.py

@@ -0,0 +1,31 @@
+from pathlib import Path
+p=Path(r'd:/Projects/Dev/ThreatHunt/backend/tests/test_api.py')
+t=p.read_text(encoding='utf-8')
+insert='''
+    async def test_hunt_progress(self, client):
+        create = await client.post("/api/hunts", json={"name": "Progress Hunt"})
+        hunt_id = create.json()["id"]
+
+        # attach one dataset so progress has scope
+        from tests.conftest import SAMPLE_CSV
+        import io
+        files = {"file": ("progress.csv", io.BytesIO(SAMPLE_CSV), "text/csv")}
+        up = await client.post(f"/api/datasets/upload?hunt_id={hunt_id}", files=files)
+        assert up.status_code == 200
+
+        res = await client.get(f"/api/hunts/{hunt_id}/progress")
+        assert res.status_code == 200
+        body = res.json()
+        assert body["hunt_id"] == hunt_id
+        assert "progress_percent" in body
+        assert "dataset_total" in body
+        assert "network_status" in body
+'''
+needle='''    async def test_get_nonexistent_hunt(self, client):
+        resp = await client.get("/api/hunts/nonexistent-id")
+        assert resp.status_code == 404
+'''
+if needle in t and 'test_hunt_progress' not in t:
+    t=t.replace(needle, needle+'\n'+insert)
+p.write_text(t,encoding='utf-8')
+print('updated test_api.py')