gh-983: fix some typing ignores, sort fixtures, tidy typing

[paddyroddy]

Description

Reattempt at #1094. Tidying up some ty: ignore statements. Sorting fixtures alphabetically and fix the missing type[] typing.. Also be more selective on from typing import <x>.

Closes: #983, #1071

Checks

• Is your code passing linting?
• Is your code passing tests?
• Have you added additional tests (if required)?
• Have you modified/extended the documentation (if required)?
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[Copilot]

Pull request overview

This PR focuses on reducing/cleaning ty suppressions and tightening typing across the library and its test suite, while also applying small formatting/consistency updates (e.g., fixture typing and line wrapping). It also updates coverage configuration patterns to account for typing.-qualified typing constructs.

Changes:

• Replaced several ty: ignore[...] return-type suppressions with explicit typing.cast(...) in core modules.
• Updated typing imports to be more selective/consistent (favoring import typing + typing.Protocol / typing.overload patterns).
• Tidied tests/benchmarks: fixture parameter annotations (type[...]) and consistent formatting/wrapping; updated coverage exclude regexes.

Reviewed changes

Copilot reviewed 31 out of 31 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/fixtures/helper_classes.py	Minor formatting tweak in helper fixture class generation.
tests/core/test_user.py	Formatting-only wrap for readability/consistency.
tests/core/test_shells.py	Formatting-only wraps for test function signatures.
tests/core/test_shapes.py	Formatting-only wraps for test function signatures.
tests/core/test_points.py	Correct fixture type annotations (type[...]) and signature formatting.
tests/core/test_observations.py	Formatting-only wraps for test function signatures.
tests/core/test_lensing.py	Removes a now-unnecessary ty: ignore after overload typing improvements.
tests/core/test_harmonics.py	Formatting-only wraps for test function signatures.
tests/core/test_galaxies.py	Formatting-only wraps for test function signatures.
tests/core/test_fields.py	Formatting-only wraps plus minor assertion formatting.
tests/core/test_arraytools.py	Formatting-only wraps for test function signatures.
tests/core/test_algorithm.py	Formatting-only wraps for test function signatures.
tests/core/grf/test_transformations.py	Formatting-only wraps for test function signatures.
tests/core/grf/test_solver.py	Formatting-only wraps for test function signatures.
tests/core/grf/test_core.py	Formatting-only wraps for test function signatures.
tests/benchmarks/test_shells.py	Fixes benchmark fixture parameter annotation to type[Compare].
tests/benchmarks/test_points.py	Fixes benchmark fixture parameter annotations to type[...].
tests/benchmarks/test_fields.py	Fixes benchmark fixture parameter annotations to type[...].
pyproject.toml	Updates coverage exclusion regexes for typing.-qualified constructs.
glass/shells.py	Replaces invalid-return-type ignore with explicit casts; adds import typing.
glass/shapes.py	Casts ellipticity outputs to ComplexArray; adds import typing.
glass/points.py	Moves Any import under TYPE_CHECKING and removes an unnecessary local annotation.
glass/lensing.py	Switches to typing.overload and casts; adjusts overload defaults for the all-False case.
glass/grf/_core.py	Uses typing.Protocol instead of importing Protocol directly.
glass/galaxies.py	Formatting-only change (trailing comma / wrapping).
glass/fields.py	Replaces return-type ignore(s) with casts; adds import typing; small formatting wrap.
glass/ext/init.py	Removes an unnecessary ty: ignore by simplifying return expression.
glass/cosmology.py	Uses typing.Protocol instead of importing Protocol directly.
glass/arraytools.py	Replaces an assignment ignore with an explicit cast around xpx.union1d.
glass/_types.py	Uses typing.ParamSpec/typing.TypeVar (via import typing) under TYPE_CHECKING.
glass/_array_api_utils.py	Moves Any import under TYPE_CHECKING to reduce runtime typing imports.

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[connoraird]

It's a shame we have to call typing stuff in the actual function bodies but I guess it's worth it.

[paddyroddy]

It's a shame we have to call typing stuff in the actual function bodies but I guess it's worth it.

Yeah, it's weird, haven't done it before. But this feels like a better (temporary) fix rather than just suppressing all errors with a # ty: ignore[] comment.