Enhance type hinting and improve code clarity in PyZaplinePlus

- Updated type hints across multiple files, including `core.py`, `noise_detection.py`, and `__init__.py`, to improve code readability and maintainability.
- Adjusted the license reference in `pyproject.toml` for consistency.
- Improved documentation links in `index.md` to ensure proper navigation.

These changes contribute to a more robust codebase and enhance the overall user experience.

Author: snesmaeili

docs/index.md

@@ -4,7 +4,7 @@
 
 [![PyPI - Version](https://img.shields.io/pypi/v/pyzaplineplus.svg)](https://pypi.org/project/pyzaplineplus/)
 [![Python Versions](https://img.shields.io/pypi/pyversions/pyzaplineplus.svg)](https://pypi.org/project/pyzaplineplus/)
-[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](../about/license.md)
+[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](about/license.md)
 [![CI](https://github.com/snesmaeili/PyZapline_plus/actions/workflows/ci.yml/badge.svg)](https://github.com/snesmaeili/PyZapline_plus/actions)
 
 ---

pyproject.toml

@@ -7,7 +7,7 @@ name = "pyzaplineplus"
 description = "Adaptive removal of spectral line-noise in EEG via DSS (Zapline-plus reimplementation)."
 readme = { file = "README.md", content-type = "text/markdown" }
 requires-python = ">=3.8"
-license = { text = "MIT" }
+license = { file = "LICENSE" }
 authors = [
   { name = "Sina Esmaeili", email = "[email protected]" }
 ]
@@ -142,3 +142,13 @@ exclude_lines = [
     "class .*\bProtocol\\):",
     "@(abc\\.)?abstractmethod",
 ]
+
+[tool.mypy]
+python_version = "3.9"
+packages = ["pyzaplineplus"]
+ignore_missing_imports = true
+warn_redundant_casts = true
+warn_unused_ignores = true
+warn_return_any = false
+no_implicit_optional = true
+check_untyped_defs = true

pyzaplineplus/__init__.py

@@ -23,7 +23,7 @@
 
 try:
     # Prefer version from package metadata (setuptools-scm)
-    from importlib.metadata import version as _pkg_version  # type: ignore
+    from importlib.metadata import version as _pkg_version
 
     __version__ = _pkg_version("pyzaplineplus")
 except Exception:  # pragma: no cover - fallback for editable installs without metadata