chore: update package manager and enhance icon metadata

- Updated package manager version to pnpm@10.11.0 in package.json.
- Added robots metadata for SEO in page.tsx.
- Changed Open Graph type from "article" to "website" and added siteName and images.
- Included canonical URL in alternates for better indexing.
- Added structured data for icons in the IconDetails component with priority loading for images.

web/src/components/icon-details.tsx

@@ -193,6 +193,7 @@ export function IconDetails({ icon, iconData, authorData, allIcons }: IconDetail
 										alt={`${iconName} in ${format} format${theme ? ` (${theme} theme)` : ""}`}
 										fill
 										loading="eager"
+										priority
 										className="object-contain p-4"
 									/>
 								</motion.div>
@@ -276,6 +277,7 @@ export function IconDetails({ icon, iconData, authorData, allIcons }: IconDetail
 								<div className="relative w-32 h-32 rounded-xl overflow-hidden border flex items-center justify-center p-3">
 									<Image
 										src={`${BASE_URL}/${iconData.base}/${icon}.${iconData.base}`}
+										priority
 										width={96}
 										height={96}
 										placeholder="empty"