chore: fix pyright type errors; add pyright config

- Cast res.color to DotColor in run_live loop.
- Add [tool.pyright] extraPaths to pyproject.toml for IDE resolution.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pyproject.toml

@@ -35,3 +35,9 @@ where = ["src"]
 [tool.pytest.ini_options]
 testpaths = ["tests"]
 pythonpath = ["src"]
+
+[tool.pyright]
+include = ["src"]
+extraPaths = ["src"]
+pythonVersion = "3.11"
+reportMissingImports = true