[Feature Request] Enable zooming on preview images in app pages

[iamkartiknayak]

Issue/Description:
Currently, the preview images shown on each app's detail page in COSMIC Store cannot be zoomed in. This makes it difficult for users to view UI details or text shown in the screenshots.

Expected Behavior:
Users should be able to click or hover to enlarge preview images, allowing a closer look at app details, a view similar to COSMIC Files.