chore: Update project configuration and enhance code quality

This commit modifies the `.gitignore` file to exclude Python library directories while ensuring the viewer-frontend's `lib` directory is not ignored. It also updates the `package.json` to activate the virtual environment during backend tests, improving the testing process. Additionally, the CI workflow is enhanced to prevent duplicate runs for branches with open pull requests. Various components in the viewer frontend are updated to ensure consistent naming conventions and improve type safety. These changes contribute to a cleaner codebase and a more efficient development workflow.

package.json

@@ -17,7 +17,7 @@
     "type-check:viewer": "npm run type-check --prefix viewer-frontend",
     "lint:python": "flake8 backend --max-line-length=100 --ignore=E501,W503 || true",
     "lint:python:syntax": "find backend -name '*.py' -exec python -m py_compile {} \\;",
-    "test:backend": "export PYTHONPATH=$(pwd) && python -m pytest tests/ -v",
+    "test:backend": "export PYTHONPATH=$(pwd) && source venv/bin/activate && python3 -m pytest tests/ -v || python3 -m pytest tests/ -v",
     "test:all": "npm run test:backend",
     "ci:local": "npm run lint:all && npm run type-check:viewer && npm run lint:python && npm run test:backend && npm run build:all",
     "deploy:dev": "npm run build:all && echo '✅ Build complete. Ready for deployment to dev server (10.0.10.121)'",