Fixed DocDetails.pages having leading/trailing whitespace

[jamesbraza]

See PR title

[Copilot]

Pull Request Overview

This PR ensures that DocDetails.pages no longer retain leading or trailing whitespace by updating the pages-cleaning logic and adding corresponding test coverage.

• Added .strip() to the pages-cleaning step in merge_bibtex_entries.
• Extended test_clients.py with a datetime import and a test case reflecting pages without surrounding whitespace.
• Introduced a new VCR cassette recording API responses where the pages field contains whitespace.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
tests/test_clients.py	Imported datetime and added a test entry to verify cleaned pages.
tests/cassettes/test_doi_search[paper_attributes3].yaml	New cassette with responses where pages includes newline whitespace.
paperqa/types.py	Appended .strip() to the pages-cleaning pipeline.

Comments suppressed due to low confidence (1)

paperqa/types.py:618

• Add unit tests specifically for misc_string_cleaning to cover cases such as leading/trailing newlines, tabs, and multiple internal spaces in the pages field. This will ensure the new .strip() logic behaves correctly across varied whitespace patterns.

    def misc_string_cleaning(data: dict[str, Any]) -> dict[str, Any]:

[mskarlin]

thanks @jamesbraza