Regression: TypeAliasForwardRef is not resolved when it apears inside of typing constructs #14003
Description
Describe the bug
When autodoc is applied to a function with type annotations that have type aliases inside of typing constructs, the signature is rendered as incorrectly.
Issue originally reported in #10333, then fixed in #10353, then re-introduced in 423452c.
An easy fix is to revert 423452c. However, 423452c was made for some reason; my guess is it was because implementation of __repr__ from #10353 was hindering debugging, or hiding some other problem. So, if we want to keep current implementation of __repr__, we'll need to add a check for TypeAliasForwardRef to stringify_annotation (probably after this branch). Note that this will create a circular dependency between sphinx.util.typing and sphinx.util.inspect.
How to Reproduce
Example: when autodoc renders function test from this code:
from __future__ import annotations
from typing import *
Alias: TypeAlias = int
def test() -> list[Alias]: ...if Alias appears in autodoc_type_aliases, the resulting signature will contain TypeAliasForwardRef('Alias') | None instead of Alias | None.
Environment Information
Platform: linux; (Linux-6.6.87.2-microsoft-standard-WSL2-x86_64-with-glibc2.39)
Python version: 3.13.8 (main, Oct 12 2025, 16:57:39) [GCC 13.3.0])
Python implementation: CPython
Sphinx version: 8.2.3
Docutils version: 0.21.2
Jinja2 version: 3.1.6
Pygments version: 2.19.2
Sphinx extensions
Additional context
No response