Support paragraph borders in the reader

[developer0hye]

What does this change?

This change makes the reader preserve paragraph borders from w:pBdr.

Previously, ParagraphBorders could be written but w:pBdr was not recognized while reading, so direct paragraph borders were silently dropped. The new reader handles top, left, bottom, right, between, and bar borders and preserves w:val, w:sz, w:space, and w:color.

References

• DOCX: preserve positioned footer tabs and borders developer0hye/office2pdf#204

Screenshots

Not applicable.

What can I check for bug fixes?

Parse a paragraph containing w:pBdr and verify that ParagraphProperty.borders contains the corresponding border positions and attributes.

Verification:

• cargo test -p docx-rs test_read_paragraph_borders
• cargo test -p docx-rs --lib -- --test-threads=1 (280 passed)
• cargo test -p docx-rs --test lib read_comment_in_delete_in_insert
• cargo test -p docx-rs --test reader read_comment_in_delete_in_insert
• rustfmt --check on the changed Rust files
• git diff --check

The two shared-fixture snapshots now include the paragraph borders already present in the source DOCX. The repository-wide make lint and cargo fmt --all --check still report pre-existing warnings and formatting differences outside these files.