Update gallery to display landscape images and use original file names

Modify the gallery component to use 16:9 aspect ratio for images on all devices, and update the server-side logic to fetch original file names from Dropbox, including handling special characters for accurate artist extraction.

Replit-Commit-Author: Agent
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client/src/components/photo-gallery.tsx

@@ -338,9 +338,9 @@ export default function GalleryPage() {
                 className="group relative rounded-lg overflow-hidden bg-card border border-card-border cursor-pointer flex flex-col"
                 data-testid={`button-gallery-image-${i}`}
               >
-                <div className="relative w-full aspect-[16/9] md:aspect-[9/16]">
+                <div className="relative w-full aspect-[16/9]">
                   <LazyImage
-                    src={isMobile && img.mobile ? img.mobile : thumbUrl(img.thumb)}
+                    src={img.mobile || thumbUrl(img.thumb)}
                     alt={img.artist || img.fileName}
                     className="absolute inset-0 w-full h-full transition-transform duration-500 group-hover:scale-110"
                   />