updated dependencies

mpdf is back to a release tag (my changes have been merged). minimum PHP
version is 8.2 now, just like DokuWiki.

Added tests

These tests have been initially LLM written, I went through each of them
to make sure they make sense and fixed what I thought needed fixing.

However coverage is still not great and sho

Added tests

These tests have been initially LLM written, I went through each of them
to make sure they make sense and fixed what I thought needed fixing.

However coverage is still not great and should be improved in the
future.

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