Refactor code structure for improved readability and maintainability

Makefile

@@ -9,14 +9,16 @@ run:
 
 build:
 	uv run pyinstaller --onefile --name planka-cli --collect-all plankapy scripts/planka_cli.py
-	chmod +x dist/planka-cli
 
 smoke: build
-	@tmp_home="$$(mktemp -d)"; \
+	@set -e; \
+	tmp_home="$$(mktemp -d)"; \
+	trap 'rm -rf "$$tmp_home"' EXIT; \
 	env -i PATH="/usr/bin:/bin:/usr/sbin:/sbin" HOME="$$tmp_home" \
 		PYTHONNOUSERSITE=1 PYTHONPATH= PYTHONHOME= \
-		./dist/planka-cli --help; \
-	rm -rf "$$tmp_home"
+		VIRTUAL_ENV= CONDA_PREFIX= CONDA_DEFAULT_ENV= PIPENV_ACTIVE= \
+		PYENV_VERSION= UV_PROJECT_ENV= \
+		./dist/planka-cli --help
 
 clean:
 	rm -rf dist build *.spec __pycache__ scripts/__pycache__