Feature/ppa page alignment

[rlskoeser]

Associated Issue(s): resolves #284 #277

Changes in this PR

• New script & methods to combine PPA page-level text corpus with images to prep dataset for publication
• Uses rapidfuzz to match pages for HathiTrust works that were updated between PPA export version and image dataset

Notes

• I suggest focusing your attention on align_shifted_pages and align_pages - this is the core of the logic for matching up HathiTrust pages with images
• I did the initial scaffolding and planning, but a fair bit of the refactoring and restructuring and most (all?) of the unit tests has been supposed by agentic ai, as you'll see in the commit history - various claude models, run through Zed, OpenCode, and ClaudeCode
• I added the version of the code with the continue flag because that was the easiest way to fix the broken unit tests

[codecov]

Codecov Report

❌ Patch coverage is 97.93388% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.63%. Comparing base (bc6a28f) to head (7b37893).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #285      +/-   ##
===========================================
+ Coverage    82.18%   83.63%   +1.44%     
===========================================
  Files           23       24       +1     
  Lines         2156     2468     +312     
===========================================
+ Hits          1772     2064     +292     
- Misses         384      404      +20     

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[laurejt]

I reviewed dataset_prep.py. It seemed good overall, but I think it might be changing the shift logic a bit so that the shift value is more intuitive (and would correspond to the appropriate shift action in polars).

Note that most of the comments will be misaligned due to file changes while drafting my review.

[laurejt]

If the two long pages shift in different ways, how does inheritance work?

[rlskoeser]

Currently the code does a forward fill and then a backward fill - so any short pages at beginning and end of a work or excerpt would get the shift of the nearest long page. Not sure how it works if this happens in the middle but seems like a reasonable solution

[laurejt]

Maybe worth a test case so we know what the expected behavior, but seems reasonable to me.

[rlskoeser]

I'm going to merge this into develop and consider the script portion done - the page shift logic still needs to be revised, and there may be other small additions (1930 images, old/new ocr), but there are enough changes already that I think merging this set in will be useful.