Fix image wrapping logic and regex

[ddegner]

Fixes wrapContentImages() to correctly process images with query strings and avoid skipping valid <img> tags due to unrelated <picture> or AVIF content.

The original wrapContentImages() function had a global early-return that prevented any image wrapping if the content contained <picture> or type="image/avif". This meant that even plain <img> tags would not be processed if these elements were present elsewhere. Additionally, the regex used to find <img> tags did not account for query strings after the file extension, causing images like image.jpg?ver=123 to be missed. This PR addresses both issues by removing the global early-return, processing all <img> tags while skipping only those already nested within a <picture>, and updating the regex to correctly match URLs with query strings. It also ensures avifUrlFor() handles query strings correctly.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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