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.

backend/tests/test_keywords.py

@@ -197,3 +197,27 @@ async def test_quick_scan(client: AsyncClient):
     assert "total_hits" in data
     # powershell should match at least one row
     assert data["total_hits"] > 0
+
+
+@pytest.mark.asyncio
+async def test_quick_scan_cache_hit(client: AsyncClient):
+    """Second quick scan should return cache hit metadata."""
+    theme_res = await client.post("/api/keywords/themes", json={"name": "Quick Cache Theme", "color": "#00aa00"})
+    tid = theme_res.json()["id"]
+    await client.post(f"/api/keywords/themes/{tid}/keywords", json={"value": "chrome.exe"})
+
+    from tests.conftest import SAMPLE_CSV
+    import io
+    files = {"file": ("cache_quick.csv", io.BytesIO(SAMPLE_CSV), "text/csv")}
+    upload = await client.post("/api/datasets/upload", files=files)
+    ds_id = upload.json()["id"]
+
+    first = await client.get(f"/api/keywords/scan/quick?dataset_id={ds_id}")
+    assert first.status_code == 200
+    assert first.json().get("cache_status") in ("miss", "hit")
+
+    second = await client.get(f"/api/keywords/scan/quick?dataset_id={ds_id}")
+    assert second.status_code == 200
+    body = second.json()
+    assert body.get("cache_used") is True
+    assert body.get("cache_status") == "hit"