Description

This PR fixes an issue where, after selecting "Ask AI", images were overlaying the AI assistant modal.

Related issues and/or PRs

N/A

Changes made

• Added a new CSS rule for img[class^="img_"] to ensure images in documentation are always positioned behind overlays and dropdowns by setting position: relative and z-index: 1.
• Adjusted the z-index of the .medium-zoom-overlay class from 15 to 1 to align with the updated image-positioning logic.

Checklist

The following is a best-effort checklist. If any items in this checklist are not applicable to this PR or are dependent on other, unmerged PRs, please still mark the checkboxes after you have read and understood each item.

• I have updated the side navigation as necessary.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation to reflect the changes.
• Any remaining open issues linked to this PR are documented and up-to-date (Jira, GitHub, etc.).
• My changes generate no new warnings.
• Any dependent changes in other PRs have been merged and published.

Additional notes (optional)

N/A