fix: correct malformed gallery URLs in admin panel View Gallery links

Fixed issue where full URLs in share_link field were incorrectly being prepended
with `/gallery/` prefix, resulting in malformed URLs like:
`/gallery/http://localhost:3000/gallery/event-slug/token`

The fix now properly handles both formats stored in the database:
- Full URLs (from adminEvents.js): Used directly
- Relative paths (from events.js): Prepended with `/gallery/`

This ensures View Gallery links work correctly regardless of which backend
endpoint created the event.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/pages/admin/EventDetailsPage.tsx

@@ -363,7 +363,11 @@ export const EventDetailsPage: React.FC = () => {
             )}
             {event.share_link && (
               <a
-                href={event.share_link}
+                href={
+                  event.share_link.startsWith('http') 
+                    ? event.share_link
+                    : `/gallery/${event.share_link}`
+                }
                 target="_blank"
                 rel="noopener noreferrer"
                 className="inline-flex items-center gap-2 px-3 py-1.5 text-sm font-medium text-primary-600 hover:text-primary-700 border border-primary-600 rounded-lg hover:bg-primary-50 transition-colors"

frontend/src/pages/admin/EventsListPage.tsx

@@ -479,7 +479,11 @@ export const EventsListPage: React.FC = () => {
                                 </button>
                                 {event.share_link ? (
                                   <a
-                                    href={event.share_link}
+                                    href={
+                                      event.share_link.startsWith('http') 
+                                        ? event.share_link
+                                        : `/gallery/${event.share_link}`
+                                    }
                                     target="_blank"
                                     rel="noopener noreferrer"
                                     className="w-full text-left px-4 py-2 text-sm text-neutral-700 hover:bg-neutral-100 flex items-center gap-2"