Improvements to unit tests & docstrings

[andrewjlock]

Primarily just improvements to tests (suppressing warnings, removing needless Jax skip) and updating docs & docstrings to match source code.

Small change to pyproj input parsing to remove numpy deprecation warning. No change to functionality.

[Copilot]

Pull request overview

This PR updates test coverage and documentation, and also adjusts a few core math utilities (refraction handling and FRD velocity projection) to improve backend compatibility and reduce warnings.

Changes:

• Added/expanded unit tests (including new ray refraction tests) and improved JAX/backend handling in rotation tests.
• Updated refraction behavior and Ray.correct_refraction() API to support direction modes.
• Adjusted project_velocity_to_az_el() to return az/el/range rates and updated its docstring accordingly; added global pytest warning filters.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/core/test_ray.py	Adds a new unit test covering Ray.correct_refraction() modes and invalid mode handling.
tests/core/test_functs.py	Removes the JAX skip by converting rotations to the active backend; expands coverage for refraction and velocity-rate projection.
src/astrix/spatial/ray.py	Extends Ray.correct_refraction() with a mode parameter and adjusts correction application logic.
src/astrix/spatial/location.py	Docstring wording updates to better reflect Point usage patterns.
src/astrix/plots/plot3d.py	Tweaks legend font size for better readability.
src/astrix/functs.py	Alters pyproj input parsing to avoid warnings; updates NED rotation docs; clips refraction elevation inputs; changes velocity-rate projection outputs/shape.
pyproject.toml	Adds pytest filterwarnings configuration to suppress “Force converting …” warnings.

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