Add features - zoom, search, progressive loading

[andwaal-esmart]

This PR adds multiple features I found lacking:

• Slider for adjusting thumbnail size
• A fussy search for filtering on images
• Progressive loading of images, which fixes the issue that the extension frooze when working with folder with a lot of images.

NOTE: These changes are made 100% using cursor/claude, I have not reviewed the code, it just works and improves the usage of the extension for me