Fix refs not being extracted

[lfoppiano]

See #93

[Copilot]

Pull Request Overview

This PR fixes a bug in reference offset calculation when searching for reference text within cleaned paragraphs. The issue was in the search area calculation where ref['offset_start'] was incorrectly used instead of ref['offset_end'] for the upper bound.

• Fixed incorrect search area boundary calculation for reference text matching
• Added a test to validate correct offset calculation for references in JSON conversion
• Removed a large test data file (bao.json) and added a smaller XML test file

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
grobid_client/format/TEI2LossyJSON.py	Fixed bug where search_end used offset_start instead of offset_end
tests/test_conversions.py	Added test case to verify reference offset accuracy
tests/resources/refs_offsets/bao.json	Removed large test data file
tests/resources/refs_offsets/2021.naacl-main.224.grobid.tei.xml	Added new XML test file

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