Fix React hook anti-patterns, incorrect mock paths, and unused code

- Replace useState+useEffect sync pattern with useMemo in
  EdgeSettingsPanel.tsx to eliminate cascading re-renders
- Remove redundant draft state in NodeSettingsPanel.tsx and use
  store data directly, eliminating useEffect sync loop
- Fix mock paths in test_tools.py: patch tavily.TavilyClient and
  pypdf.PdfReader at their source modules (lazy imports)
- Remove unused variable assignment in routes.py (god mode reject)
- Remove unused node_lookup dicts in dynamic_graph_builder.py
- Remove unused imports across test files (Blueprint, CouncilState,
  pytest, llm assignments)
- Remove unused CouncilBlueprint type import in types.test.ts
- Run npm audit fix to resolve moderate vulnerability

All 107 backend tests and 26 frontend tests pass. Ruff, ESLint,
and TypeScript checks are clean.

https://claude.ai/code/session_01XqzyT6fhS8sUe9P5fCmuVU

backend/services/dynamic_graph_builder.py

@@ -366,9 +366,6 @@ def build_graph_from_blueprint(
     if not nodes:
         raise ValueError("Blueprint has no nodes.")
 
-    # Build node lookup
-    node_lookup = {n["id"]: n for n in nodes}
-
     # Find entry point: the node that has no incoming edges
     targets = {e["target"] for e in edges}
     entry_candidates = [n["id"] for n in nodes if n["id"] not in targets]
@@ -559,7 +556,6 @@ def _build_graph_with_checkpointer(
     if not nodes:
         raise ValueError("Blueprint has no nodes.")
 
-    node_lookup = {n["id"]: n for n in nodes}
     targets = {e["target"] for e in edges}
     entry_candidates = [n["id"] for n in nodes if n["id"] not in targets]
     if not entry_candidates: