fix: prevent crash from invalid bbox coordinates in HTML export

[samiuc]

Currently, when doc.export_to_html() is called on a document with invalid geometry (e.g., a bounding box where y_max < y_min), Pillow's underlying crop function raises a ValueError. This causes the entire visualization process to crash, preventing the generation of reports if even one document has bad data.

The PR logs the error with the specific page number and continues processing the remaining pages and documents. It inserts a clear error message directly into the generated HTML for the page that failed to render.

[mergify]

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• title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert)(?:\(.+\))?(!)?:

[github-actions]

❌ DCO Check Failed

Hi @samiuc, your pull request has failed the Developer Certificate of Origin (DCO) check.

This repository supports remediation commits, so you can fix this without rewriting history — but you must follow the required message format.

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🛠 Quick Fix: Add a remediation commit

Run this command:

git commit --allow-empty -s -m "DCO Remediation Commit for samiullahchattha <Sami.Ullah1@ibm.com>

I, samiullahchattha <Sami.Ullah1@ibm.com>, hereby add my Signed-off-by to this commit: 4d1cf05d9a3f1f74618cc16692c4170dad5c905e"
git push

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For the latest commit:

git commit --amend --signoff
git push --force-with-lease

For multiple commits:

git rebase --signoff origin/main
git push --force-with-lease

More info: DCO check report