Clicking exec pictures should open in a modal

[FawazBinSaleem]

Use the existing ImagePreviewModal.tsx component to allow users to click on exec/team member pictures and view them in a modal.
This would be implemented in PeopleList.tsx, where team member cards are rendered. Each PersonCard image should become clickable and open the selected image in the modal.

Expected behavior:

• Clicking a team member picture opens a larger preview in a modal
• The modal displays the selected image with appropriate alt text
• The modal can be closed normally
• Images should scale properly on different screen sizes