Add support for Python 3.14

[jayqi]

• Fix tests for Python 3.14
• Add Python 3.14 to metadata
• Fixes bug where typing or annotationlib would spuriously identified as the module for forward references in some cases

[github-actions]

🚀 Deployed on https://typenames-pr17--preview-7c642f.netlify.app

[Copilot]

Pull Request Overview

This PR adds support for Python 3.14 by adapting to major typing system changes introduced in that version. Python 3.14 unified typing.Union and types.UnionType into a single implementation, making them indistinguishable and always rendering with | operator syntax.

• Updates handling of union types to account for the unified implementation in Python 3.14
• Fixes forward reference processing to prevent spurious module names
• Removes deprecated ByteString mapping for Python 3.14+

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
typenames/init.py	Updates union type detection logic and removes ByteString mapping for Python 3.14+
tests/test_typenames.py	Adds version-specific test cases and regression test for forward reference bug
pyproject.toml	Adds Python 3.14 classifier
README.md	Documents Python 3.14 typing behavior changes
CHANGELOG.md	Documents new features and bug fixes
.github/workflows/tests.yml	Adds Python 3.14 to CI test matrix

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