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/tests/test_dynamic_graph_builder.py

@@ -23,7 +23,7 @@ from services.dynamic_graph_builder import (
     _get_llm,
 )
 from services.graph_builder import create_initial_state
-from state import CouncilState, APPROVAL_THRESHOLD, MAX_ITERATIONS
+from state import APPROVAL_THRESHOLD, MAX_ITERATIONS
 
 
 # ---------------------------------------------------------------------------
@@ -321,10 +321,10 @@ class TestModelLookup:
 
     def test_claude_model_creates_instance(self):
         with patch("services.dynamic_graph_builder.ChatAnthropic") as MockLLM:
-            llm = _get_llm("claude-3-5-sonnet")
+            _get_llm("claude-3-5-sonnet")
             MockLLM.assert_called_once()
 
     def test_gpt4o_model_creates_instance(self):
         with patch("services.dynamic_graph_builder.ChatOpenAI") as MockLLM:
-            llm = _get_llm("gpt-4o")
+            _get_llm("gpt-4o")
             MockLLM.assert_called_once()