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/api/routes.py

@@ -222,7 +222,7 @@ async def approve_god_mode(
         )
 
     if request.action == "reject":
-        state = await resume_god_mode(run_id, action="reject")
+        await resume_god_mode(run_id, action="reject")
         run_store.update(run_id, {"status": "failed", "error": "Rejected by user in God Mode."})
         return CouncilResultResponse(
             run_id=run_id,