Keep original photos ratio if not 3/2 on Viewer

- Fix previousPage usage
- Fix entering animation timings and previous photo navigation
- Add fade transition on fullscreen viewer for mobile
- Display date only if existing

src/routes/[country]/[location]/[photo].ts

@@ -53,6 +53,7 @@ export async function get({ params }: RequestEvent): Promise<RequestHandlerOutpu
                     image {
                         id
                         title
+                        width, height
                     }
                     city
                 }